WABCO ABS, RSC, ESC, HSA Maintenance Manual

Before You Begin

1. Read and understand all instructions and procedures before you begin to service components.

2. Read and observe all Warning and Caution hazard alert messages in this publication. They provide information that can help prevent serious personal injury, damage to components, or both.

3. Follow your company’s maintenance and service, installation and diagnostics guidelines.

4. Use special tools when required to help avoid serious personal injury and damage to components.

Hazard Alert Messages and Torque Symbols

Read and observe all Warning and Caution hazard alert messages in this publication. They provide information that can help prevent serious personal injury, damage to components, or both.

Release all air from the air systems before you remove any components. Pressurized air can cause serious personal injury.

When welding on an ABS- or ABS/ATC-equipped vehicle is necessary, disconnect the power connector from the ECU to prevent damage to the electrical system and ABS/ATC components.

How to Obtain Additional Maintenance, Service and Product Information

Visit wabco-auto.com to access and order additional information.

Contact WABCO North America Customer Care at 855-228-3203 (United States and Canada); 001-800-889-1834 (Mexico).

If Tools and Supplies are Specified in This Manual

Call Meritor’s Commercial Vehicle Aftermarket at 888-725-9355 to obtain Meritor tools and supplies.

A Warning alerts you to an instruction or procedure that you must follow exactly to avoid serious personal injury and damage to components.

A Caution alerts you to an instruction or procedure that you must follow exactly to avoid damage to components.

@ This symbol alerts you to tighten fasteners to a specified torque

value.

To prevent serious personal injury, always wear safe eye protection when you perform vehicle maintenance or service.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

Information contained in this publication was in effect at the time the publication was approved for printing and is subject to change without notice or liability. WABCO reserves the right to revise the information presented or to discontinue the production of parts described at any time.

Asbestos and Non-Asbestos Fibers

ASBESTOS FIBERS WARNING

The following procedures for servicing brakes are recommended to reduce exposure to asbestos fiber dust, a cancer and lung disease hazard. Material Safety Data Sheets are available from WABCO.

Hazard Summary

Because some brake linings contain asbestos, workers who service brakes must understand the potential hazards of asbestos and precautions for reducing risks. Exposure to airborne asbestos

dust can cause serious and possibly fatal disea and cancer, principally lung cancer and mesothelioma (a cancer of the lining of the chest or abdominal cavities). Some studies show that the risk of lung cancer among persons who smoke and who are exposed to asbestos is much great these diseases may not become apparent for 15, 20 or more years after the first exposure to asbestos.

Accordingly, workers must use caution to avoid creating and breathing dust when servicing brakes. Specific recommended work practices for red employer for more details.

ses, including asbestosis (a chronic lung disease)

er than the risk for non-smokers. Symptoms of

ucing exposure to asbestos dust follow. Consult your

Recommended Work Practices

1. Separate Work Areas. Whenever feasible, service brakes in a separate area away from other operations to reduce risks to unprotected persons. OSHA has set a maximum allowable level of

exposure for asbestos of 0.1 f/cc as an 8-hour time a 30-minute period. Scientists disagree, however, to what extent adherence to the maximum allowable exposure levels will eliminate the risk of disease that can result from inh dust. OSHA requires that the following sign be posted at the entrance to areas where exposures exceed either of the maximum allowable levels:

DANGER: ASBESTOS

CANCER AND LUNG DISEASE HAZARD

AUTHORIZED PERSONNEL ONLY

RESPIRATORS AND PROTECTIVE CLOTHING

ARE REQUIRED IN THIS AREA.

2. Respiratory Protection. Wea approved by NIOSH or MSHA for use with asbestos at all times when servicing brakes, beginning

with the removal of the wheels.

3. Procedures for Servicing Brakes.

a. Enclose the brake assembly within a negative pr

equipped with a HEPA vacuum and worker arm sleeves. With the enclosure in place, use the HEPA vacuum to loosen and vacuum residue from the brake parts.

b. As an alternative procedure, use a catch

non-phosphate, water-based detergent to wash the brake drum or rotor and other brake parts. The solution should be applied with low pressure to prevent dust from becoming

airborne. Allow the solution to flow between the brake rotor and caliper. T he wheel hub and brake assembly components should be thoroughly

wetted to suppress dust before the brake shoes or brake pads are re parts clean with a cloth.

c. If an enclosed vacuum system or brake washing equipment is not available, employers may

adopt their own written procedures for servicing brakes, provided that the exposure levels associated with the employer enclosed vacuum system or brake washing equipment. Consult OSHA regulations for more details.

d. Wear a respirator equipped with a HEPA filter approved by NIOSH or MSHA for use with

asbestos when grinding or machining b a local exhaust ventilation system equipped with a HEPA filter.

e. NEVER use compressed air by itself, dry brushing, or a vacuum not equipped with a HEPA

filter when cleaning brake parts or assemblies. NEVER use carcinogenic solvents, fla solvents, or solvents that can damage brake components as wetting agents.

4. Cleaning Work Areas. Clean work areas with a vacuum equipped with a HEPA filter or by wet wiping. NEVER use compressed air or dry sweeping to clean work areas. When you empty vacuum cleaners an

d handle used rags, wear a respirator equipped with a HEPA filter approved by NIOSH or MSHA for use with asbestos. When you replace a HEPA filter, wet the filter with a fine mist of water and dispose of the used filter with care.

5. Worker Clean-Up. After servicing Shower after work. Do not wear work clothes home. Use a vacuum equipped with a HEPA filter to vacuum work clothes after they are worn. Launder them separately. Do not shake or use compressed air to remove dust from work clothes.

6. W

aste Disposal. Dispose of discarded linings, used rags, cloths and HEPA filters with care, such as in sealed plastic bags. Consult applicable EPA, state and local regulations on waste disposal.

r a respirator equipped with a high-efficiency (HEPA) filter

’s procedures do not exceed the levels associated with the

brakes, wash your hands before you eat, drink or smoke.

-weighted average and 1.0 f/cc averaged over

aling asbestos

essure enclosure. The enclosure should be

basin with water and a biodegradable,

brake drum and the brake support or the

moved. Wipe the brake

rake linings. In addition, do such work in an area with

mmable

Regulatory Guidance

References to OSHA, NIOSH, MSHA, and EPA, which are regulatory agencies in the United States, are made to provide further guidance to employers and workers employed within the United States. Employers and workers employed outside of the United S apply to them for further guidance.

tates should consult the regulations that

NON-ASBESTOS FIBERS WARNING

The following procedures for servicing brakes are recommended to reduce exposure to non-asbestos fiber dust, a cancer and lung disease hazard. Material Safety Data Sheets are available from WABCO.

Hazard Summary

Most recently manufactured brake linings do not contain asbestos fibers. These brake linings may contain one or more of a variety of ingredients, including glass fibers, mineral wool, aramid fibers, ceramic fibers and silica that can present health risks if inhaled. of the risks from exposure to these substances. Nonetheless, exposure to silica dust can cause silicosis, a non-cancerous lung disease. Silicosis gradually reduces lung capacity and efficiency and can result in serious brea fibers, when inhaled, can cause similar diseases of the lung. In addition, silica dust and ceramic fiber dust are known to the State of California to cause lung cancer. U.S. and internation agencies have also determined that dust from mineral wool, ceramic fibers and silica are potential causes of cancer.

Accordingly, workers must use caution to avoid creating and breathing dust when servicing brakes. Specific recommended your employer for more details.

thing difficulty. Some scientists believe other types of non-asbestos

work practices for reducing exposure to non-asbestos dust follow. Consult

Scientists disagree on the extent

Recommended Work Practices

1. Separate Work Areas. Whenever feasible, service brakes in a separate area away from other operations to reduce risks to unprotected persons.

2. Respiratory Protection. OSHA has set a maximum allowable level of exposure for silica of

0.1 mg/m3 as an 8-hour time-weighted average. Some manufacturers of non-asbestos brake linings recommend that exposures to other ingredients found in non-asbestos brake linings be kept below 1.0 f/cc as an 8-hour time-weighted average. Scientists dis extent adherence to these maximum allowable exposure levels will eliminate the risk of disease that can result from inhaling non-asbestos dust.

Therefore, wear respiratory protection at all times during brake servicing, beginning with the removal of the wheels. Wear a respirator equipped with a high-efficiency (HEPA) filter approved by NIOSH or MSHA, if the exposure levels may exceed OSHA or manufacturers’ recommended maximum levels. Even when exposures are expected wearing such a respirator at all times during brake servicing will help minimize exposure.

3. Procedures for Servicing Brakes.

a. Enclose the brake assembly within a negative pressure enclosure. The enclosure shoul

equipped with a HEPA vacuum and worker arm sleeves. With the enclosure in place, use the HEPA vacuum to loosen and vacuum residue from the brake parts.

b. As an alternative procedure, use a catch basin with water and a biodegradable,

non-phosphate, water-based detergent to wash the brake drum or rotor and other brake parts. The solution should be applied with low pressure to prevent dust from becoming

airborne. Allow the solution to flow between the brake drum and the brake rotor and caliper. T he wheel hub and brake assembly components should be thoroughly

wetted to suppress dust before the brake shoes or brake pads are removed. Wipe the brake p

arts clean with a cloth.

c. If an enclosed vacuum system or brake washing equipment is not available, carefully clean

the brake parts in the open air. Wet the parts with a solution applied with a pump-spray bottle that creates a fine mist. Use a solution containing water, and, if available, a biodegradable, non-phosphate, water-based detergent. The wheel hub and brake assembly components should be thoroughly wetted to suppress dust before the brake shoes or brake pads a removed. Wipe the brake parts clean with a cloth.

d. Wear a respirator equipped with a HEPA filter approved by NIOSH or MSHA when grinding or

machining brake linings. In addition, do such work in an area with a local exhaust ventilation system equipped with a HEPA filter.

e. NEVER

use compressed air by itself, dry brushing, or a vacuum not equipped with a HEPA

filter when cleaning brake parts or assemblies. NEVER use carcinogenic solvents, flammable solvents, or solvents that can damage brake components as wetting agents.

4. Cleaning Work Areas. Clean work areas with a vacuum equipped with a HEPA filter or by wet wiping. NEVER use compressed air or dry sweeping to clean work areas. When you empty vacuum cleaners and handle used rags, wear a respirator equipped with a HEPA filter approved by NIOSH or MSHA, to minimize water and dispose of the used filter with care.

5. Worker Clean-Up. After servicing brakes, wash your hands before you eat, drink or smoke. Shower after work. Do not wear work clothes home. Use a vacuum equipped with a HEPA filter to vacuum work clothes after they are worn. Launder them separately. Do not shake or use compressed air to remove dust from work clothes.

6. Waste Disposal. Dispose of discarded linings, used rags, cloths and HEPA filters with care, such as in sealed plastic bags. C disposal.

exposure. When you replace a HEPA filter, w et the filter with a fine mist of

onsult applicable EPA, state and local regulations on waste

to be within the maximum allowable levels,

agree, however, to what

d be

brake support or the

Regulatory Guidance

tates should consult the regulations that

WABCO Maintenance Manual MM-0112 (Revised 07-18)

Contents

pg. pg.i Asbestos and Non-Asbestos Fibers

1 Section 1: Introduction

Contents Anti-Lock Braking System (ABS) System Components Electronic Control Unit (ECU)

Wheel Speed Sensing Systems 2 Pressure Modulator Valves 3 Active Braking Valves (ABV)

Brake Pressure Sensor (BPS)

Steering Angle Sensor (SAS) 4 Electronic Stability Control (ESC) Module

Trailer Modulator Valve

Off-Road ABS Switch

ATC Switch

Blink Code Switch

System Configuration

Section 2: Stability and Safety Enhancement

Systems

ATC

ATC Components

ATC Switch 7 Roll Stability Control (RSC)

RSC Components 9 Electronic Stability Control (ESC)

ESC Components 11 Hill Start Aid (HSA)

HSA Components 12 Drag Torque Control

Lift Axle Capability

Section 3: Diagnostics, Troubleshooting and

Testing

General

Maintenance Information

ABS Indicator Lamp 14 Diagnostics

TOOLBOX™ Software Diagnostics 17 Blink Code Diagnostics (ABS Only) 23 Testing

Wheel Speed Sensor Testing 25 Modulator Valve Testing 29 Active Braking Valves (ABV) Testing 32 Brake Pressure Sensor Testing 33 ESC CAN Network Testing

ESC Module Testing 35 Steering Angle Sensor (SAS) Testing

37 ECU Circuit Testing

J1939 Serial Communications Testing

Section 4: Component Replacement

Component Removal and Installation

Wheel Speed Sensors 40 Modulator Valves 41 Active Braking Valves (ABV) 42 ABS Valve Packages 44 Active Braking Valve on the ABS Valve Package 45 Electronic Control Unit (ECU) 46 Steering Angle Sensor (SAS) — WABCO Only 47 Electronic Stability Control (ESC) Module 48 Brake Pressure Sensor

Section 5: System Configurations

System Configuration Layouts

Section 6: Wiring Diagrams and Connectors

ECU Connector Pin Assignments

Section 7: SPN, SID, FMI Fault Codes

SPN, SID, FMI Diagnostic Trouble Code List

Section 8: Appendix I

Reconfiguration Procedure

How to Reconfigure an ECU (E Version)

TOOLBOX™ Software 95 Manual Reconfiguration

Section 9: Appendix II

E4 ESC End of Line Calibration Procedure

Section 10: Appendix III

104

E8 ESC End of Line Calibration Procedure

Section 11: Appendix IV

108

Aftermarket Programming

Aftermarket Programming Procedures 116 Aftermarket Programming Failure Codes List

1 Introduction

4010603a

1 Introduction

Contents

This manual contains service information for the following systems.

앫 E version WABCO Anti-Lock Braking System (ABS)

앫 Automatic Traction Control (ATC)

앫 Roll Stability Control (RSC)

앫 Electronic Stability Controls (ESC) for trucks, tractors and buses

The ABS version is marked on the ECU. Figure 1.1. If you cannot identify the ECU version installed on your vehicle, contact WABCO North America Customer Care at 855-228-3203.

Figure1.1

Anti-Lock Braking System (ABS)

ABS is a system designed to provide and maintain the best possible traction and steering control during an extreme braking event. During a potential wheel lock event, the ABS ECU, using information provided by the wheel speed sensors, sends a signal(s) to the appropriate modulator valve(s) to hold, apply or release the brakes as needed. ABS works automatically, the driver does not have to select this feature.

System Components

Electronic Control Unit (ECU)

The ECU is the control center or “brain” of the ABS, RSC and ESC systems. It receives information from the sensors, processes data and sends signals to modulators and active braking valves to achieve different tasks. Depending on the system and vehicle configuration, ECUs are available for cab- or frame-mounted applications and are divided into Basic Cab, Universal Cab, Frame and Advance Frame models. RSC and ESC systems are only available on universal and advance frame ECUs. Figure 1.2.

Figure 1.1

For Additional Information

Diagnostic and testing procedures for other ECU versions can be found in the following manuals.

앫 C version ECUs — Maintenance Manual 28, Anti-Lock Braking

Systems (ABS) for Trucks, Tractors and Buses

앫 D version ECUs — Maintenance Manual 30, Anti-Lock Braking

Systems (ABS) for Trucks, Tractors and Buses

Refer to the following manuals for Trailer ABS diagnostics and information.

앫 Maintenance Manual 33, Easy-Stop™ Trailer ABS

앫 Maintenance Manual MM-0180, Enhanced Easy-Stop™ Trailer

ABS with PLC

Figure1.2

UNIVERSAL

ECU

Figure 1.2

FRAME-MOUNTED

BASIC

ECU

4003974a

Wheel Speed Sensing Systems

Wheel speed sensing systems consist of a tooth wheel mounted on the hub or rotor of each monitored wheel and a speed sensor installed with its end against the tooth wheel. The sensor continuously sends wheel speed information to the ECU. A sensor clip holds the sensor in place and against the tooth wheel. Figure 1.3.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

1 Introduction

WARNING

1002009b

SENSOR

CLIP

SENSOR

TOOTH WHEEL

1002011a

472 500 30. 0

MADE IN GERMANY

001 20/98

1003359a

Figure1.3

Figure 1.3

The type of axle determines sensor mounting location.

앫 Steering axle sensors are installed in the steering knuckle or in a

bolted-on bracket.

앫 Drive axle sensors are mounted in a block attached to the axle

housing or in a bolted-on bracket.

Check the wheel speed sensors for correct alignment and adjustment. Apply lubricant to the sensor and sensor clip whenever wheel-end maintenance is performed. Make sure tooth wheels are free of contaminants. Refer to Section 3 and Section 4 for more information.

A modulator valve is usually located on a frame rail or cross member near the brake chamber or as part of a valve package. A valve package combines two modulator valves, a service relay (Figure 1.5) or quick release valve (Figure 1.6), and depending on the vehicle configuration, an active braking valve (ABV).

Figure1.5

Figure 1.5

Figure1.6

Pressure Modulator Valves

A modulator valve controls air pressure to an affected wheel-end brake during an ABS, RSC or ESC event to reduce speed and prevent wheel lock up. Modulator valves are also used during ATC events to properly gain traction on the affected wheel end. Figure 1.4.

Figure1.4

AIR OUT (PORT 2)

AIR IN (PORT 1)

BAYONET-STYLE CONNECTOR

PRODUCT IDENTIFICATION TAG

4003992b

Figure 1.4

Figure 1.6

Easy Listening Tip!

To ensure the ABS valves are working — just listen! Figure 1.7.

Park the vehicle on a level surface. Block the wheels to prevent the vehicle from moving. Support the vehicle with safety stands. Do not work under a vehicle supported only by jacks. Jacks can slip or fall over. Serious personal injury and damage to components can result.

1. Turn on the ignition.

2. Wait for the ABS indicator lamp to come on.

3. Listen for the valves to click or puff/chuff air in the order shown in Figure 1.7.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

1 Introduction

3 1

2 4

4 1

3 6

2 5

1002006d

4M CHANNEL

CAB

CURBSIDE

CAB

CURBSIDE

6M CHANNEL

Figure1.7

Figure1.8

SOLENOID VALVE

(ACTIVE BRAKING VALVE)

Figure 1.8

CABLE

4007846a

Brake Pressure Sensor (BPS)

The Brake Pressure Sensor or BPS is part of the RSC, ESC and HSA system. It provides the system with the driver’s brake demand. The sensor can be located in the primary or secondary delivery circuit depending on the application. Figure 1.9.

Figure1.9

27 FT-LB

(36.6 Nm)

TORQUE

Figure 1.7

NOTE: In previous versions of ABS, the valves are cycled diagonally. Diagonal cycling does not occur with E version ABS.

Active Braking Valves (ABV)

Active Braking Valves, sometimes referred to as ABVs or 3/2 valve, are solenoid valves used for active braking during ATC, RSC or ESC events. Depending on system configurations, ABVs can be located in the front axle braking system, rear axle braking system and/or the trailer service brake system. Figure 1.8.

4006870a

Figure 1.9

Steering Angle Sensor (SAS)

The Steering Angle Sensor (SAS) is part of the ESC system. The SAS delivers the driver’s steering input (steering wheel position) to the ECU using a dedicated ESC system internal data link. The ECU supplies the sensor with voltage and ground. The SAS must be calibrated using diagnostic tools whenever it is replaced, or when any vehicle steering components are replaced or adjusted. Refer to Section 8. Figure 1.10.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

1 Introduction

4006873a

4010604a

WARNING

DO NOT MOVE OR RELOCATE

Figure1.10

Figure 1.10

Electronic Stability Control (ESC) Module

The ESC module is part of the ESC system. It measures the vehicle yaw rate as well as vehicle lateral acceleration. The ESC module includes part of the ESC control algorithm. It exchanges data with the ECU via the ESC system internal data link. The ECU supplies the module with voltage and ground. The ESC module must be initialized by diagnostic tools whenever the ECU or the ESC module is replaced. Refer to Section 8. Figure 1.11.

Figure1.11

Off-Road ABS Switch

On some vehicles, an off-road ABS switch can be included. The off-road ABS function improves vehicle control and helps reduce stopping distances in off-road conditions or on poor traction surfaces such as loose gravel, sand and dirt.

ATC Switch

A vehicle manufacturer might offer an ATC switch to control the ATC function. Depending on the vehicle ECU configuration for the switch, there are two function options.

앫 Deep snow and mud option

앫 ATC momentary override option

Refer to Section 2 for more information regarding these features.

Blink Code Switch

A vehicle manufacturer might offer a Blink Code switch to obtain simple troubleshooting information. Refer to Section 3 for more information about Blink Codes.

System Configuration

The system configuration is defined by the number of wheel end sensors and modulator valves. There are three common system configurations used with E version ECUs. Refer to Section 5 for more system configurations.

Figure 1.11

Trailer Modulator Valve

In some stability control applications, an additional modulator valve (the same as what is used for ABS modulation) will be located in the trailer control line downstream of the 3/2 solenoid valve used to control the trailer.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

앫 4S/4M (4 wheel speed sensors, 4 modulator valves)

앫 6S/4M (6 wheel speed sensors, 4 modulator valves)

앫 6S/6M (6 wheel speed sensors, 6 modulator valves)

Each system configuration can have features such as ATC, HSA, RSC or ESC. See Figure 1.12 and Figure 1.13 for an example.

Figure1.12

1002004h

WHEEL SPEED

SENSORS

ABS

MODULATOR

VALVES

ABS MODULATOR VALVE

ABS

MODULATOR

VALVE

RELAY VALVE

WHEEL SPEED SENSORS

ECU

4S/4M CONFIGURATION — ABS ONLY

AIR LINES

ELECTRICAL LINES

LAMPS

QUICK

RELEASE

VALVE

1 Introduction

Figure 1.12

Figure1.13

4S/4M ABS/ATC

VALVE PACKAGE

INSTALLATION (FRONT)

LAMPS

VALVE PACKAGE

INSTALLATION (REAR)

AT C VA LV E

AIR LINES

LAMPS (UP TO THREE: ABS, TRAILER ABS, ATC)

1002004g

Figure 1.13

WABCO Maintenance Manual MM-0112 (Revised 07-18)

2 Stability and Safety Enhancement Systems

NORMAL

VEHICLE

OPERATION

EXCESSIVE WHEEL

SPIN ATC

OPERATIONAL

(ATC LAMP COMES ON)

1002015a

(ATC LAMP IS OFF)

WHEELS

STOP

SPINNING

(ATC LAMP GOES OUT)

2 Stability and Safety Enhancement Systems

ATC

Automatic Traction Control is available as an option on all E version ECUs and is standard on most. ATC helps improve traction in low traction road conditions. ATC reduces the potential of jackknifing caused by excessive wheel spin during acceleration or in curves. ATC works automatically in two different ways.

A. When one drive wheel is spinning at a different speed than the

other, ATC momentarily applies the brake until traction is regained.

B. When both drive wheels are spinning on a poor-traction

surface, ATC automatically reduces engine power to attain optimum tire-to-road traction.

ATC will automatically turn on and off. Driver input is not required to turn this feature on. If the vehicle experiences a traction control event, the ATC indicator lamp will come on, indicating ATC is active. The light turns off when the event has ended. Figure 2.1.

Figure2.1

ATC Components

ATC uses the base ABS components plus an active braking valve that can be installed with individual modulator valves, or installed as part of the rear valve package.

When installed with individual modulator valves, the active braking valve is mounted on the frame or cross member, near the rear of the vehicle.

When it is part of the rear valve package, the active braking valve is attached to the relay valve. Figure 2.2.

Figure2.2

4010605a

Figure 2.1

NOTE: Some vehicle manufacturers may refer to ATC as Anti-Spin Regulation (ASR).

If ATC is installed, there will be an indicator lamp on the vehicle dash or instrument panel marked ATC, ASR, or potentially Stability Control, depending on the application.

Figure 2.2

ATC Switch

If the vehicle manufacturer offers an ATC switch to control the ATC functionality, there are two common types of configuration settings as follows.

앫 Deep snow and mud option: This function helps to increase

available traction on extra soft surfaces like snow, mud or gravel, by slightly increasing the permissible wheel spin.

앫 ATC momentary override option: This function allows the

driver to momentarily disable/override ATC for the duration of the ignition cycle.

When either option is in use, the ATC indicator lamp blinks continuously to inform the driver. Figure 2.3.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

2 Stability and Safety Enhancement Systems

1002018a

Figure2.3

Figure 2.3

Switch and lamp locations as well as ATC switch configuration will vary depending on the vehicle make and model. Please check with the vehicle manufacturer for correct information.

Here’s how the ATC switch works.

Similar to ATC, RSC works automatically. The driver does not have to select this feature. Unlike ATC, RSC cannot be turned off by the driver.

RSC Components

RSC uses many of the same components used by ABS/ATC including modulator valves, active braking valves and wheel speed sensors. RSC ECUs are different from ABS ECUs as they contain an internal accelerometer that measures and updates the lateral acceleration of the vehicle and compares it to a critical threshold at which rollover may occur.

Depending on the vehicle manufacturer, RSC ECUs have orientation on the XX/YY or ZZ axis. For correct operation and the best performance, verify the ECU is correctly leveled and securely mounted. Figure 2.4, Figure 2.5 and Figure 2.6.

Figure2.4

Z ± 2°

+92°

-2°

Function

System

Driver Action

Response

Press ATC switch ATC lamp blinks

Active

Not

Active

continuously

Press ATC switch again

ATC lamp stops blinking

NOTE: Turning off the ignition will also deactivate either ATC function.

Roll Stability Control (RSC)

Roll stability control is an option designed to assist drivers in managing the conditions that may result in vehicle rollovers. When RSC senses conditions that may result in a rollover, it may reduce engine torque, engage the engine retarder, apply pressure to the drive axle brakes and may modulate the trailer brakes to slow the vehicle down. Depending on the application and vehicle configuration, the steer axle brakes may be applied as well.

Figure 2.4

X ± 2°

DRIVING

DIRECTION

XX Orientation

4010606a

WABCO Maintenance Manual MM-0112 (Revised 07-18)

2 Stability and Safety Enhancement Systems

WARNING

4010607a

Z ± 2°

Y ± 2°

DRIVING

DIRECTION

+2° ± 90°

ZZ Orientation

4010608a

0° ± 2°

DRIVING

DIRECTION

0° ± 92°

YY Orientation

Figure2.5

RSC helps reduce the tendency of the vehicle to roll over when cornering or changing directions, however, IT CAN NOT PREVENT ALL ROLLOVERS FROM OCCURRING.

When operating the vehicle, always use safe driving techniques. The driver is always the most important factor in safe vehicle operation.

Figure 2.5

Figure2.6

Figure 2.6

Certain vehicle configurations can have an additional active braking valve for trailer service brakes, an active braking valve for front axle brakes and a brake pressure sensor.

The active braking valve for trailer braking is a stand-alone valve that is not available as part of the ABS/ATC valve package. Depending on the application, a modulator valve may be located downstream of the solenoid valve. Figure 2.7.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

2 Stability and Safety Enhancement Systems

4007813a

VALVE PACKAGE

INSTALLATION (REAR)

AIR LINES ELECTRICAL LINES

4S/4M RSC/ATC

(ALSO AVAILABLE IN

6S CONFIGURATIONS)

VALVE PACKAGE

INSTALLATION (FRONT)

LAMPS

TRAILER STABILITY

CONTROL

MODULATOR

(OPTIONAL)

PRESSURE

SENSOR

(OPTIONAL)

AT C VA LV E

FRONT AXLE ACTIVE BRAKING VA LV E (OPTIONAL)

TRACTOR

PROTECTION

VA LV E

TRAILER ACTIVE

BRAKING

VA LV E

Figure2.7

Figure 2.7

Electronic Stability Control (ESC)

Electronic Stability Control (ESC) combines the rollover prevention of Roll Stability Control (RSC) with directional stability in order to keep the vehicle traveling on its intended path by providing spinout and

Like RSC, ESC is automatic. It becomes active when the system senses imminent directional or roll instabilities, often before the driver is aware. You will notice a difference in the vehicle when stability control is functioning, but you should continue to drive as normal and provide any additional needed corrections.

drift out control.

You may again notice a reduction in engine torque and additional deceleration from the retarder, if so equipped. You also may notice individual or all brakes applying depending on whether the vehicle is in a roll or directional control event.

ESC Components

ESC is built from the ABS platform and uses many of the same components as ATC and RSC. An active braking valve to control the front axle brakes, a pressure sensor, an ESC module and a Steering Angle Sensor (SAS) are required in addition to the components necessary for RSC. Figure 2.8 and Figure 2.9. These components are also described in the following section.

Note that for ESC applications on a non-towing vehicle (straight truck), the trailer active braking valve is not required.

The ESC ECU is available in both Cab- and Frame-mounted versions. The Universal Cab-Mounted ECU with ESC is an upgraded version of the current Universal ABS ECU with a fourth connector containing the necessary inputs/outputs required for full stability control. The Frame-Mounted Advance ECU with ESC is an upgraded version of the current ABS Frame-Mounted ECU with six additional pins on both the X1 and X2 connectors of the ECU. These ECUs support 4S4M, 6S4M and 6S6M vehicle configurations and are compatible with 12V electrical systems. For pinout information, refer to Section 6 of this manual.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

2 Stability and Safety Enhancement Systems

4010609a

± 5°

-5°

+2°

-2°

+2°

-2°

The ESC ECU contains parameter settings which are specific to a vehicle configuration validated by WABCO Engineering. It is imperative that the correct ECU is installed on your vehicle in service. Contact WABCO or your respective vehicle OEM with any questions regarding ESC ECU. Figure 2.8 and Figure 2.9.

Figure2.8

Figure 2.8

NOTE: ESC modules are installed by the OEM close to the vehicle center of gravity. Depending on the vehicle manufacturer, the ESC module might face towards the front of the vehicle or rear. For correct operation and the best performance, verify the ESC module is correctly leveled and securely mounted according to OEM specifications. Do not move the module to a different location as this will affect the system performance.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

2 Stability and Safety Enhancement Systems

4007814a

VALVE PACKAGE

INSTALLATION (REAR)

AIR LINES ELECTRICAL LINES

4S/4M ESC/ATC

(ALSO AVAILABLE IN

6S CONFIGURATIONS)

ESC

MODULE

LAMPS

TRAILER ACTIVE

BRAKING

VA LV E

TRAILER STABILITY

CONTROL

MODULATOR

(OPTIONAL)

PRESSURE

SENSOR

ATC VALVE

SAS

FRONT AXLE ACTIVE BRAKING VA LV E

TRACTOR

PROTECTION

VA LV E

Figure2.9

Figure 2.9

Hill Start Aid (HSA)

Hill Start Aid (HSA) supports select automated manual transmissions in reducing/totally eliminating the rolling back of the vehicle while launching on a grade. When requested from the transmission, HSA holds pressure in the service brakes of all axles of the towing vehicle when the vehicle is standing still. HSA will hold pressure for a maximum of three seconds following full release of the brake pedal. Communication between the transmission and the ECU takes place via the J1939 data link.

HSA grade threshold parameters may be modified in the Transmission ECU. These parameters must be reviewed with the transmission manufacturer prior to making any modifications in order to ensure safe operation.

HSA Components

HSA is available on ABS ECUs with E4.4 software revision or higher. Same as ESC, HSA is built from the ABS platform and uses many of the same components as ATC and RSC. HSA uses the front axle active braking valve as well as the rear active braking valve to help

maintain the pressure trapped during HSA activation.

A pressure sensor provides the system with the driver’s brake demand. The measured pressure is used by HSA to set the trapped pressure and/or activate the HSA function.

The vehicle manufacturer can provide an HSA switch multiplexed through the dashboard or hard wired for momentary HSA deactivation.

An HSA lamp, either hard wired or multiplexed, provides the driver with a visual indication of system deactivation and/or active fault. If the lamp is hard wired, it must be an incandescent lamp or LED with a resistor to prevent the ECU from setting a fault code.

A failure detected on any of these components will lead to no HSA availability. To troubleshoot the HSA, refer to Section 3 – Diagnostics, Troubleshooting and Testing.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

2 Stability and Safety Enhancement Systems

Drag Torque Control

The ABS ECU has the ability to send a message to the engine to increase engine RPM to prevent drive axle lock-up, if the vehicle is on a downhill grade and in the incorrect gear.

Lift Axle Capability

Certain six sensor ABS ECUs with ATC allow third axle sensors to be installed on a lift axle. These ECUs will not log a fault for the axle being in the raised position while the vehicle is moving.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

3 Diagnostics, Troubleshooting and Testing

1002000a

3 Diagnostics, Troubles hooting and Test ing

General

Maintenance Information

There is no regularly scheduled maintenance required for the WABCO ABS, ATC, RSC or ESC systems. However, this does not change current vehicle maintenance requirements.

앫 Lamp Check: To ensure the ABS tractor lamp is operating,

drivers should check the lamp every time the vehicle is started. When the vehicle is started, the ABS lamp should come on momentarily. If it does not come on, it could mean a burned-out bulb.

앫 ABS Wheel Speed Sensors: Check the wheel speed sensor

adjustment and lubricate the sensor and sensor clip whenever wheel-end maintenance is performed. Use only WABCO-recommended lubricant, as specified in Section 4.

ABS Indicator Lamp

Two ABS indicator lamps, one for tractor and one for trailer, let drivers know the status of the system. Figure 3.1. The tractor ABS lamp is also used to display tractor blink code diagnostics. The location of the ABS indicator lamps varies depending on the make and model of the vehicle.

앫 If the vehicle is equipped with ATC and RSC/ESC, when the

ignition is turned to the ON position, the ABS and ATC/RSC/ESC will both light but the ATC/RSC/ESC lamp will stay lit briefly after the ABS lamp goes out.

Figure3.2

Both lamps come

ABS

ATC

on at ignition ON and turn off after approximately three seconds. Vehicle equipped with ABS and ATC.

Both lamps come on at ignition ON. ATC/RSC/ESC lamp stays on briefly after ABS lamp goes out. Vehicle equipped with ABS, ATC and RSC/ESC.

Figure3.1

Figure 3.1

ATC and RSC/ESC functions may share the same dash indicator lamp. Therefore, understanding how the ABS and ATC/RSC/ESC lamps work is very important.

앫 If the vehicle is equipped with ATC, but not RSC/ESC, when the

ignition is turned to the ON position, the ABS and ATC lamps will light for approximately three seconds, and then both lamps will turn off simultaneously. Figure 3.2.

4005299d

Figure 3.2

The ABS indicator lamp works as follows:

NOTE: If the ECU senses a tractor ABS fault during normal vehicle operation, the ABS indicator lamp will come on and stay on.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

3 Diagnostics, Troubleshooting and Testing

OFF

1002005a

Ignition ON Normal Operation ABS lamp comes on at ignition

momentarily for a bulb check, then goes out.

After servicing ABS components

Off-road ABS operation. Refer to the off-road ABS information

ABS lamp does not go out at ignition.

ABS lamp flashes during vehicle operation.

in this section.

Existing fault or lamp issue ABS lamp does not go out at

ignition.

Diagnostics

NOTE: Blink code diagnostics are not compatible with E8 software

versions.

Use any of the following methods to diagnose E version ECUs:

앫 Wabco TOOLBOX™ Software, a PC-based diagnostic and

testing program that runs in Microsoft Windows



XP, Vista,

To display E version ABS, RSC, ESC or HSA faults:

1. Connect the computer to the vehicle:

앫 Attach the USB/serial cable from your computer’s USB or

serial port to the adapter.

앫 Attach the Deutsch diagnostic cable from the adapter to the

vehicle. Figure 3.3.

Windows 7 or Windows 8 operating system.

Figure3.3

앫 Blink Codes. Refer to the information in this section.

앫 OEM Diagnostic Displays. Refer to the vehicle operator’s manual.

System is OK.

When vehicle is driven at speeds above 4 mph (6 km/h), lamp goes out. System is OK.

The vehicle’s normal ABS function is being modified due to road conditions.

Lamp does not go out at speeds above 4 mph (6 km/h) — a fault may exist in the ABS system or lamp is permanently shorted.

USB OR

SERIAL CABLE

If you have any questions about system diagnostics, please contact WABCO North America Customer Care at 855-228-3203.

TOOLBOX™ Software Diagnostics

For complete instructions for installing and using TOOLBOX™ Software, refer to the User’s Manual posted on wabco-na.com.

WABCO TOOLBOX™ Software provides computer-based diagnostic capabilities for the complete range of WABCO vehicle control systems. The program provides the following functions:

앫 Displays both static (e.g., ECU number) and dynamic (e.g.,

RPMs) information from the system under test.

앫 Displays both active and stored system faults, as well as the

appropriate repair instructions.

앫 Activates system components to verify system integrity, correct

component operation and installation wiring.

NOTE: For E8 software versions, TOOLBOX™ 12 or higher is required.

TO VEHICLE

DEUTSCH

CONNECTOR

Figure 3.3

ADAPTER

4010610a

2. Select the TOOLBOX™ Software icon from the desktop or from



the Windows

Start Menu to display the Main Menu.

3. Adapter Selection

Verify the TOOLBOX™ Software is set for the device and communication protocol that will be used.

To access “Adapter Selection” for TOOLBOX™ Software 11 or newer, click on “Utilities” from the main TOOLBOX™ page or under “System Setup” in “J1707/PLC TOOLBOX” from the main TOOLBOX page. Figure 3.5.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

3 Diagnostics, Troubleshooting and Testing

4011997a

To access “Comport Settings” for TOOLBOX™ Software versions prior to TOOLBOX™ Software 11, click on “System Setup” from the main TOOLBOX™ page. Figure 3.6.

Make sure the “Vendor:” and “Adapter:” drop-downs are set for the device being used and set the “Protocol:” drop-down to J1708 OR J1939 according to the system you will be communicating through, and click “OK”. Figure 3.4.

Figure3.4

4. Depending on the software version used, there will be two options to communicate with the vehicle:

앫 If using TOOLBOX™ 11 or higher and a vehicle with

Software ECU E4.4b or higher, diagnostics over J1939 communications can be possible. Figure 3.5.

NOTE: E8 software versions will only communicate over J1939.

앫 J1708 communications are possible with any TOOLBOX™

Software version and any D or E Version ECU. Figure 3.6.

NOTE: When switching between J1939 and J1708 communications, vehicle ignition must be cycled between sessions to correctly communicate with ECU.

Figure3.5

WABCO TOOLBOX 11.5

WABCO TOOLBOX

Figure 3.4

NOTE: When switching between J1939 and J1708 communications with TOOLBOX™ Software 11, the vehicle ignition must be cycled between sessions to correctly communicate with the ECU.

NOTE: TOOLBOX™ Software must be connected to the vehicle and the vehicle ignition must be ON in order to display information. If unable to communicate with the ECU:

앫 Verify device and data link connections are secure.

앫 Verify the device is RP1210A compliant and that the

comport settings (Vendor, Protocol, Adapter) in TOOLBOX™ Software are correct.

앫 Verify the device software and firmware is up to date.

앫 Check all the powers and grounds coming to the ECU

including load testing.

앫 Check J1587 circuit at the ECU and the data link connector.

앫 Check J1939 circuit at the ECU and the data link connector.

4010611a

Figure 3.5

Figure3.6

WABCO TOOLBOX J1 708 Diagnostics

4010612a

Figure 3.6

WABCO Maintenance Manual MM-0112 (Revised 07-18)

3 Diagnostics, Troubleshooting and Testing

4010613a

WABCO Toolbox - Pneumatic ABS Diagnostics

WABCO Pneumatic ABS

4010614a

WABCO ABS

5. In the Main Menu, select J1939 Tractor ABS or J1708 TOOLBOX™, then Tractor ABS. The ABS Main Screen will

appear. Figure 3.7 and Figure 3.8.

Figure3.7

Figure 3.7

Figure3.8

Figure3.9

4010615a

Figure 3.9

Figure3.10

Figure 3.8

6. Select Display from the top menu.

7. From the pull-down menu, select Faults or Diagnostic Trouble Codes. This will open the Fault Information screen. Figure 3.9 and Figure 3.10.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

4010616a

Figure 3.10

8. A description of the fault, the number of times the fault occurred, the system identifier (SID), the failure mode (FMI) and Suspect Parameter Number (SPN) are all displayed in the fault information window. Basic repair instructions for each fault are also provided. More detailed information about SID and FMI troubleshooting and repair is provided in the following section as well as the SID FMI table.

3 Diagnostics, Troubleshooting and Testing

Double-clicking on the fault, or clicking on Details, will provide troubleshooting and detailed repair instructions. TOOLBOX™ Software version 11 also provides links to the appropriate system schematic which are also provided in this maintenance manual.

NOTE: If you are using TOOLBOX™ Software version 11, Internet Explorer is required to load files containing repair information, maintenance manual and schematics.

Faults that may occur after the screen is displayed will not appear until screen is manually updated. Use the Update button to refresh the fault information table.

After making the necessary repairs, use the clear faults button to clear the fault. Use the Update button to refresh the fault information table and display the new list of faults. Some faults may require vehicle ignition to be cycled and vehicle speed over 4 mph (6.4 kph) to clear them.

Use the Save or Print button to save or print the fault information data.

NOTE: If the TOOLBOX™ Software is unable to communicate with the ECU, verify the system is self-testing when the key is cycled.

ABS Indicator Lamp: This lamp serves two purposes: it alerts drivers to an ABS tractor fault and it is used during diagnostics to display the blink code.

Blink Code: A series of blinks or flashes that describe a particular ABS fault or condition. Codes are displayed in two-digit blink codes.

Blink Code Cycle: Two sets of flashes with each set separated by a one-and-one-half second pause. Blink codes are defined in the blink code identification information in this section.

Blink Code Switch: A momentary switch that activates blink code diagnostic capabilities. Switch types and locations vary, depending on the make and model of the vehicle.

Clear: The process of erasing faults from the ECU.

Diagnostics: The process of using blink codes to determine ABS

faults.

Fault: An ABS malfunction detected and stored in memory by the WABCO ECU. System faults may be Active or Stored.

Active Fault: A condition that currently exists in the ABS; for example: A sensor circuit malfunctions on the left front steering axle. An active fault must be repaired before it can be cleared from memory — and before you can display additional blink code faults.

If the system is not self-testing: Check all the powers and grounds connecting to the ECU including load testing.

If the system is self-testing: Check the following.

앫 Verify the ECU part number.

앫 Verify device and data link connections are secure.

앫 Verify the device is RP1210A compliant and that the

comport settings (Vendor, Protocol, Adapter) in TOOLBOX™ Software are correct.

앫 Verify the device software and firmware is up-to-date.

Blink Code Diagnostics (ABS Only)

Definitions

Blink codes can be used to obtain fault information for ABS components, however, due to the advanced level of complexity of ESC, RSC and HSA, it is recommended to use WABCO TOOLBOX™ Software for detailed troubleshooting of any of these systems.

Before using blink code diagnostics, you should be familiar with a few basic terms. If you used previous versions of WABCO’s blink code diagnostics, review these definitions to identify major changes.

Stored Fault: There are two types of stored faults:

A. A repaired active fault that has not been cleared from the

ECU.

B. A fault that occurred but no longer exists. For example, a

loose wire that makes intermittent contact. Because stored faults are not currently active, they do not have to be repaired before they can be cleared from memory.

WABCO recommends you keep a record of these faults for future reference.

System Configuration Code: One-digit code displayed during the clear mode. Blink codes for common ABS configurations are shown in Figure 3.11.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

3 Diagnostics, Troubleshooting and Testing

4S/4M

6S/6M - 6x2

6S/4M

1002020c

6S/6M - 6x4

NUMBER OF

FLASHES

ABS

CONFIGURATION

Figure3.11

Figure 3.11

Clear Mode

To erase faults from the ECU, you must be in the clear mode. To enter the clear mode, press and hold the blink code switch for at least three seconds, then release.

If the system displays eight quick flashes followed by a system configuration code, the clear was successful. Stored ABS faults have been cleared from memory.

If you do not receive eight flashes, there are still active faults that must be repaired before they can be cleared.

NOTE: The clear mode is also used to disable the ATC function.

Table A: Troubleshooting with Blink Code Diagnostics

Procedure System Response Action

Diagnostics Mode

Step I.

Turn ignition ON.

Possible responses:

ABS indicator lamp comes on momentarily then goes out, indicating System OK.

ABS indicator lamp does not light, indicating

No recognizable active faults in the ABS. No action required.

Inspect wiring. Inspect bulb. Make necessary repairs.

possible wiring fault or burned-out bulb.

ABS indicator lamp stays on, indicating:

Continue with blink code diagnostics. (Go to Step II.)

Drive vehicle — lamp will go out when vehicle reaches 4 mph (6 km/h).

Connect ECU.

Check harness powers and grounds at the ECU.

앫 Fault, or faults, in the system.

앫 Sensor fault during last operation.

앫 Faults cleared from ECU, but vehicle not

driven.

앫 ECU disconnected.

앫 Power or ground wiring issue.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

3 Diagnostics, Troubleshooting and Testing

Procedure System Response Action

Step II.

Press and hold Blink Code Switch for one second, then release.

ABS indicator lamp begins flashing two-digit blink code(s).

Determine if fault is active or stored:

Active Fault: Lamp will repeatedly display one code.

Stored Fault: Lamp will display code for each stored fault then stop blinking. Faults will be displayed one time only.

Step III.

Count the flashes to

First Digit: 1-8 flashes, Pause (1-1/2 seconds)

Second Digit: 1-6 flashes, Pause (4 seconds)

Find definition for blink code on blink code chart.

determine the blink code.

Step IV.

Turn ignition OFF.

Active Fault Make the necessary repairs. Repeat Step 1, Step II

and Step III until System OK, code (1-1) received.

Repair and record faults. Stored Fault Record for future reference.

NOTE: Last fault stored is first fault displayed.

Clear Mode

Step V.

Turn ignition ON.

Clear Faults from memory:

ABS indicator lamp flashes eight times. All stored faults successfully cleared.

Turn ignition OFF.

Eight flashes not received. Active faults still exist, repeat Step I through Step V.

Press and hold blink code switch for at least three seconds, then release.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

3 Diagnostics, Troubleshooting and Testing

Pause

1.5 s

Pause

1.5 s

1-8 Flashes

Pause

1.5 s

Pause

4 s

1-6 Flashes

Light ON

Active Fault

Pause

1.5 s

Pause

1.5 s

Light ON

1 Second

Hold

1 Second

Hold

System OK

Continues until ignition is turned off

1st Digit

(2) (3) (2) (

(5)

(1) (1)

(2) (3) (4)

2nd Digit

Pause

1.5 s

Pause

1.5 s

Pause

1.5 s

Pause

4 s

Light ON

Off

Stored Faults

Displays all stored faults once—last fault stored is displayed first

Blink Code 1-1: System OK

1st Digit 2nd Digit 1st Digit 2nd Digit

1st Stored Fault 2nd Stored Fault

Repeat of Blink Code

1 Second

Hold

1002021b

Example: Blink Code 2-3: Fault in ABS modulator

valve, right rear drive axle.

S = Seconds

Example: Blink Code 5-2: Sensor signal erratic, left front steer axle. 3-4: Too much sensor gap, left rear drive axle.

Blink Code Illustrations

Figure3.12

Figure 3.12

WABCO Maintenance Manual MM-0112 (Revised 07-18)

Figure3.13

Pause

1.5 s

Pause

4 s

Pause

4 s

Light ON

Faults Cleared

Pause

4 s

Pause

4 s

Pause

4 s

Pause

4 s

Light ON

Faults Not Cleared (Active Faults Still Exist)

3 Second

Hold

3 Second

Hold

Continues until ignition is turned off

Note: After faults are cleared and vehicle is started, ABS lamp will stay on until vehicle is driven over 4 mph (6 km/h).

Continues until ignition is turned off

(2) (2) (2) (2)

8 Quick Blinks = Faults Cleared SYSTEM ID

SYSTEM ID SYSTEM ID SYSTEM ID SYSTEM ID

SYSTEM ID

Pause

4 s

Pause

4 s

SYSTEM ID SYSTEM ID

System Configuration Code 2: 4S/4M System

1002022a

S = Seconds

3 Diagnostics, Troubleshooting and Testing

Figure 3.13

NOTE: If the vehicle does not have a blink code switch, a test lead/ jumper wire may be installed as a temporary blink code switch.

For Cab mounted ECUs: Back probe pin 15 of the X1 connector to ground for 1 second to obtain codes or back probe pin 15 for 3 seconds to clear codes.

For Frame mounted ECUs with all 12 pin connectors: Back probe pin 10 of the X1 connector to ground for 1 second to obtain codes or back probe pin 10 for 3 seconds to clear codes.

For Frame mounted ECUs with all 18 pin connectors: Back probe pin 15 of the X1 connector to ground for 1 second to obtain codes or back probe pin 15 for 3 seconds to clear codes.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

3 Diagnostics, Troubleshooting and Testing

Blink Code Conditions

When using blink code diagnostics, the following conditions could occur:

Table B: Blink Code Conditions

Condition Reason Action

ABS indicator lamp does not come on at ignition.

Can’t use blink code diagnostics. ABS indicator lamp will not go off when blink code is activated.

Eight flashes not received after blink code switch pressed for at least three seconds, then released.

Loose or burned-out bulb. Check bulb.

Voltage not within acceptable range (9.5-14.0 volts) (18-32 for 24V system).

Switch not held for correct length of time:

1 Second — Diagnostics Mode

3 Seconds — Clear All Mode

Incorrect or faulty wiring. Inspect and repair wiring.

Fault not erased from ECU after report. Repeat procedure until System O.K. code received.

Active faults still exist. Identify active faults, then make necessary repairs.

Blink Code Identification

Use the following information to identify the blink code:

Check connections.

Make necessary repairs.

Check connections.

Measure voltage.

Make necessary repairs.

Repeat procedure, hold switch for correct length of time.

Turn ignition OFF, then repeat Blink Code Diagnostics.

First Digit (Type of Fault) Second Digit — Specific Location of Fault

1 No faults 1 No faults

2 ABS modulator valve

3 Too much sensor gap

4 Sensor short or open

5 Sensor signal erratic/tire size

6 Tooth wheel

WABCO Maintenance Manual MM-0112 (Revised 07-18)

1 Right front steer axle (curb side)

2 Left front steer axle (driver’s side)

3 Right rear drive axle (curb side)

4 Left rear drive axle (driver’s side)

5 Right rear/additional axle (curb side)

6 Left rear/additional axle (driver’s side)

3 Diagnostics, Troubleshooting and Testing

First Digit (Type of Fault) Second Digit — Specific Location of Fault

7 System function 1 J1939 or proprietary ESC CAN. Several sensors out of adjustment

2 ATC 3/2 valve

3 Retarder relay or third brake relay such as drive line brake, exhaust brake or engine brake

4 ABS indicator lamp

5 ATC configuration

6 Trailer active braking valve or front axle active braking valve

7 Brake pressure sensor

8 Tire pressure monitoring

8 ECU 1 Low power supply

2 High power supply

3 Internal fault

4 System configuration error

5 Ground

6 RSC accelerometer or ESC module

Testing

Wheel Speed Sensor Testing

Sensor Adjustment

앫 Push the sensor in until it contacts the tooth wheel.

앫 Do not pry or push sensors with sharp objects.

앫 Sensors will self-adjust during wheel rotation.

Electrical Checks

앫 Check wheel speed sensor by itself for resistance.

앫 Check ECU harness and sensor together for resistance.

Figure 3.14 and Figure 3.15.

앫 Verify no change in resistance or open circuit between sensor by

itself and through harness.

앫 Check harness by itself for any shorts to battery and shorts to

ground.

Location Measurement

Between sensor leads 900-2000 ohm

At ECU harness pins with sensor connected

ECU harness by itself for DC voltage or ground

Sensor output voltage At least 0.2 volt AC at 30 rpm

NOTE: Sensor resistance can change with temperature. All readings should be taken at the same time and before vehicle is driven.

Same as above, no more than 1 ohm difference

No continuity

앫 Measurements should read as follows:

WABCO Maintenance Manual MM-0112 (Revised 07-18)

3 Diagnostics, Troubleshooting and Testing

X1X4

4007203a

CAB MOUNT ECU’S:

LOOKING INTO WIRE HARNESS CONNECTOR

4007204a

FRAME MOUNT ECU WITHOUT ESC:

LOOKING INTO WIRE

HARNESS CONNECTOR

FRAME MOUNT ECU WITH ESC:

LOOKING INTO WIRE

HARNESS CONNECTOR

3456

710129118

3456

710129118

X1-GRAY X2-BLACK

X4-BROWN

(ONLY FOR 6 CHANNEL)

X4-BROWN

(ONLY FOR 6 CHANNEL)

X3-GREEN

3456

71012 911 8

123456

710129118

3456

710129118

3456

710129118

3456

710129118

X1-BLACK

X3-GREEN

131618 1517 14

3456

71012 911 8

131618 1517 14

X2-GREEN

Figure3.14

Figure 3.14

Figure3.15

Figure 3.15

ECU Sensor Connector Pins

Cab-Mounted

Universal with ESC, Universal or Basic

LF X2-18 pin 12 and 15

RF X2-18 pin 10 and 13

LR X2-18 pin 11 and 14

RR X2-18 pin 17 and 18

LR (3rd axle) X3-15 pin 2 and 5

WABCO Maintenance Manual MM-0112 (Revised 07-18)

RR (3rd axle) X3-15 pin 11 and 14

ECU Sensor Connector Pins

Frame-Mounted

Non-ESC

LF X2-Black 7 and 8

RF X2-Black 5 and 6

LR X3-Green 1 and 2

RR X3-Green 3 and 4

LR (3rd axle) X4-Brown 3 and 4

RR (3rd axle) X4-Brown 5 and 6

3 Diagnostics, Troubleshooting and Testing

BAYONET-STYLE CONNECTOR

4004022a

EXHAUST SOLENOID (BLUE WIRE)

INLET SOLENOID (BROWN WIRE)

GROUND TERMINAL

OPEN-STYLE CONNECTOR

GROUND TERMINAL

EXHAUST SOLENOID (BLUE WIRE)

INLET SOLENOID

(BROWN WIRE)

4004021a

ECU Sensor Connector Pins

Frame-Mounted

With ESC

LF X2-Green 17 and 18

RF X2-Green 5 and 6

LR X3-Green 1 and 2

RR X3-Green 3 and 4

LR (3rd axle) X4-Brown 3 and 4

RR (3rd axle) X4-Brown 5 and 6

Modulator Valve Testing

Electrical Checks

앫 Check modulator valve by itself for resistance. Figure 3.16 and

Figure 3.17.

앫 Check ECU harness and modulator valve together for resistance.

Figure 3.18 and Figure 3.19.

앫 Verify no change in resistance or open circuit between valve by

itself and through harness.

앫 Check harness by itself for any shorts to battery and shorts to

ground.

Figure3.16

Figure 3.16

Figure3.17

앫 Measurements should read as follows:

Location Measurement

Inlet valve pin to Ground 4.0-9.0 ohm for 12V system

Outlet valve pin to Ground 4.0-9.0 ohm for 12V system

At ECU harness pins with modulator valve connected

ECU harness by itself for battery voltage or ground

NOTE: If resistance exceeds 9.0 ohm for 12V system (21.0 ohm for 24V system), verify the reading was not taken between the inlet and outlet. If the correct pins were tested, clean the electrical contacts at the modulator and retest.

11.0-21.0 ohm for 24V system

Same as above, no more than 1 ohm difference

No continuity

Figure 3.17

WABCO Maintenance Manual MM-0112 (Revised 07-18)

3 Diagnostics, Troubleshooting and Testing

X1X4

4007205a

CAB MOUNT ECU’S:

LOOKING INTO WIRE HARNESS CONNECTOR

Figure3.18

Figure 3.18

ECU Modulator Circuit Connector Pins

Cab-Mounted

Universal with ESC, Universal or Basic

(ABS modulators are grounded externally, i.e., common is fed to external ground)

Optional with Stability Control

LF IV X2-18 pin 3

LF OV X2-18 pin 6

RF IV X2-18 pin 1

RF OV X2-18 pin 4

LR IV X2-18 pin 2

LR OV X2-18 pin 5

RR IV X2-18 pin 8

RR OV X2-18 pin 9

LR (3rd Axle) IV X3-15 pin 3

LR (3rd Axle) OV X3-15 pin 6

RR (3rd Axle) IV X3-15 pin 12

RR (3rd Axle) OV X3-15 pin 15

Trailer IV X3-15 pin 7

Trailer OV X3-15 pin 10

Trailer Common X3-15 pin 8

WABCO Maintenance Manual MM-0112 (Revised 07-18)

Figure3.19

4007206a

FRAME MOUNT ECU WITHOUT ESC:

LOOKING INTO WIRE

HARNESS CONNECTOR

FRAME MOUNT ECU WITH ESC:

LOOKING INTO WIRE

HARNESS CONNECTOR

3456

710129118

3456

710129118

X1-GRAY X2-BLACK

X4-BROWN

(ONLY FOR 6 CHANNEL)

X4-BROWN

(ONLY FOR 6 CHANNEL)

X3-GREEN

3456

71012 911 8

123456

710129118

3456

710129118

3456

710129118

3456

710129118

X1-BLACK

X3-GREEN

131618 1517 14

3456

71012 911 8

131618 1517 14

X2-GREEN

Figure 3.19

3 Diagnostics, Troubleshooting and Testing

ECU Modulator Circuit Connector Pins

Frame-Mounted

Non-ESC

LF IV X2-Black 2

LF OV X2-Black 10

LF Common X2-Black 11

RF IV X2-Black 4

RF OV X2-Black 3

RF Common X2-Black 9

LR IV X3-Green 12

LR OV X3-Green 10

LR Common X3-Green 11

RR IV X3-Green 9

RR OV X3-Green 7

RR Common X3-Green 8

LR (3rd Axle) IV X4-Brown 12

LR (3rd Axle) OV X4-Brown 10

LR (3rd Axle)

X4-Brown 11

Common

RR (3rd Axle) IV X4-Brown 9

RR (3rd Axle) OV X4-Brown 7

RR (3rd Axle) Common

X4-Brown 8

ECU Modulator Circuit Connector Pins

Frame-Mounted

With ESC

WABCO Maintenance Manual MM-0112 (Revised 07-18)

LF IV X2-Green 2

LF OV X2-Green 15

LF Common X2-Green 14

RF IV X2-Green 4

RF OV X2-Green 3

RF Common X2-Green 16

LR IV X3-Green 12

LR OV X3-Green 10

LR Common X3-Green 11

RR IV X3-Green 9

RR OV X3-Green 7

RR Common X3-Green 8

LR (3rd Axle) IV X4-Brown 12

LR (3rd Axle) OV X4-Brown 10

LR (3rd Axle)

X4-Brown 11

Common

RR (3rd Axle) IV X4-Brown 9

RR (3rd Axle) OV X4-Brown 7

RR (3rd Axle) Common

X4-Brown 8

3 Diagnostics, Troubleshooting and Testing

4010617a

ECU Modulator Circuit Connector Pins

Optional with Stability Control

Trailer IV X2-Green 1

Trailer OV X2-Green 10

Trailer Common X2-Green 13

Modulator Valve Testing Available in WABCO TOOLBOX™ Software (PC Diagnostics)

The ABS modulator valves as well as the trailer modulator valve can be cycled using WABCO TOOLBOX™ Software.

To cycle the modulator valves, choose the option “Valves” from the “Component Tests” drop-down menu. Or, if you are using TOOLBOX™ Software version 11 or higher, from “Components”. Figure 3.20.

Figure3.20

Figure3.21

4010619a

Figure 3.21

Figure3.22

WABCO Toolbox - Activate Valves

Figure 3.20

The valve selection screen will appear where you can choose to cycle each valve individually or you can choose to cycle all valves in a pre-determined order. Figure 3.21 and Figure 3.22.

Then, listen to ensure the correct valve is cycling. This is helpful in verifying correct operation, installation and wiring.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

4010620a

Figure 3.22

NOTE: If you are using versions older than TOOLBOX™ Software V11, to test the function of the Trailer Stability Control Modulator valve, choose “E4.3 TBV with ABS Valve” from the “Component Tests” drop-down menu. Listen to ensure the correct valve is cycling.

Active Braking Valves (ABV) Testing

X1X4

4007207a

CAB MOUNT ECU’S:

LOOKING INTO WIRE HARNESS CONNECTOR

Electrical Checks

앫 Check ABV 3/2 solenoid by itself for resistance.

앫 Check ECU harness and ABV 3/2 solenoid together for

resistance. Figure 3.23 and Figure 3.24.

앫 Verify no change in resistance or open circuit between ABV by

itself and through harness.

앫 Check harness by itself for any shorts to battery and shorts to

ground.

앫 Measurements should read as follows:

Location Measurement

ABV Supply to ABV Common 7.0-14.0 ohm for 12V system

26.3-49.0 ohm for 24V system

3 Diagnostics, Troubleshooting and Testing

At ECU harness pins with ABV connected

ECU harness by itself for battery voltage or ground

Figure3.23

Figure 3.23

Same as above, no more than 1 ohm difference

No continuity

WABCO Maintenance Manual MM-0112 (Revised 07-18)

3 Diagnostics, Troubleshooting and Testing

4007208a

FRAME MOUNT ECU WITHOUT ESC:

LOOKING INTO WIRE

HARNESS CONNECTOR

FRAME MOUNT ECU WITH ESC:

LOOKING INTO WIRE

HARNESS CONNECTOR

3456

710129118

3456

710129118

X1-GRAY X2-BLACK

X4-BROWN

(ONLY FOR 6 CHANNEL)

X4-BROWN

(ONLY FOR 6 CHANNEL)

X3-GREEN

3456

71012 911 8

123456

710129118

3456

710129118

3456

710129118

3456

710129118

X1-BLACK

X3-GREEN

131618 1517 14

3456

71012 911 8

131618 1517 14

X2-GREEN

Figure3.24

Figure 3.24

Active Braking

ECU

Cab-Mounted

Universal with ESC, Universal or Basic

Valve Circuit Connector Pins

Drive Axle ABV

X2-18 pin 16

Supply

Drive Axle ABV

X2-18 pin 7

Common

Steer Axle ABV

X4-18 pin 16

Supply

Steer Axle ABV

X4-18 pin 13

Common

Trailer ABV Supply X3-15 pin 13

Trail e r ABV

X3-15 pin 8

Common

Frame-Mounted

Non-ESC

Drive Axle ABV Supply

Drive Axle ABV

X3-Green 5

X3-Green 6

Common

Trailer ABV Supply X2-Black 1

Trail e r ABV Common

X2-Black 12

Active Braking

ECU

Frame-Mounted

With ESC

Valve Circuit Connector Pins

Drive Axle ABV

X3-Green 5

Supply

Drive Axle ABV

X3-Green 6

Common

Steer Axle ABV

X2-Green 12

Supply

Steer Axle ABV

X2-Green 11

Common

Trailer ABV Supply X1-Black 9

Trailer ABV

X1-Black 8

Common

ABV Testing Available in WABCO TOOLBOX™ Software

The Active Braking Valves can be cycled using WABCO TOOLBOX™ Software.

To cycle the ABVs, choose the option “Valves” from the “Component Tests” drop-down menu. Figure 3.25. Or if you are using TOOLBOX™ Software version 11 or higher, from “Components”. Figure 3.26.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

3 Diagnostics, Troubleshooting and Testing

4010621a

4010622a

WABCO Toolbox – Pneumatic ABS Diagnostics

Figure3.25

Figure 3.25

Figure3.26

Figure3.27

4010623a

Figure 3.27

Figure 3.26

The valve selection screen will appear where you can choose to cycle Front Axle ABV, Rear Axle ABV or Trailer ABV individually. Figure 3.27 or Figure 3.28.

Then, listen to ensure the correct valve is cycling. This is helpful in verifying correct operation, installation and wiring.

Figure3.28

WABCO Toolbox - Activate Valves

4010624a

Figure 3.28

WABCO Maintenance Manual MM-0112 (Revised 07-18)

3 Diagnostics, Troubleshooting and Testing

4007210a

PRESSURE SENSOR CONNECTOR

NOTE: If you are using versions older than TOOLBOX™ Software version 11, to test the function of the Trailer ABV, choose “Trailer Brake Valve” or “E4.3 Trailer Brake Valve” from the “Component Tests” drop-down menu. Listen to ensure the correct valve is cycling. If you are unsure which test option to choose, please contact WABCO North America at 855-228-3203 and have your ECU part number available.

Brake Pressure Sensor Testing

Electrical Checks

For the following check, all of the ECU connectors must be plugged in as the ECU provides voltage and ground to the BPS.

앫 Take measurements at the pressure sensor harness connector.

Figure 3.29.

앫 Measure Voltage Supply to Ground on Pin 1 of the BPS

Connector Key ON.

With ECU and BPS disconnected:

앫 Verify continuity end to end on all 3 lines.

앫 Verify no shorts to ground or battery on all 3 lines.

Pin Circuit

1 Voltage Supply

2 Ground

3 Pressure Signal

Pressure Sensor Testing Available in WABCO TOOLBOX™ Software

The pressure sensor test can be accessed through WABCO TOOLBOX™ Software under Component Tests, Pressure Sensor.

앫 Ensure brake pedal position and pressure is displayed in the

corresponding boxes. Figure 3.30 and Figure 3.31.

Figure3.30

앫 Verify no continuity between pins.

Measurements should read as below.

Location Measurement

Voltage Supply to Ground 8.0-16.0V

Pressure Signal or Ground Line

No continuity

short to battery or ground

Figure3.29

Figure 3.29

4010625a

Figure 3.30

Figure3.31

WABCO Toolbox – Pressure Sensor

4010626a

WABCO Maintenance Manual MM-0112 (Revised 07-18)

Figure 3.31

3 Diagnostics, Troubleshooting and Testing

4010627a

SAS

ESC

MODULE

CAB ECU

CAN

L H

GND

4010628a

SAS

ESC

MODULE

FRAME

ECU

CAN

L H

GND

ESC CAN Network Testing

The ECU, SAS and ESC module are all connected on propriety CAN network with internal terminating resistors on each one of these components. A failure to one of the components will cause others to fault out. Figure 3.32 and Figure 3.33.

Figure3.32

Figure 3.32

Figure3.33

앫 Measure terminating resistance across CAN High and Low with

Key OFF.

앫 Frame-mounted ECU only: Measure ground resistance Key OFF

to chassis ground.

With ECU and ESC Module disconnected:

앫 Verify continuity end to end on each line

앫 Verify no shorts to ground or battery on all lines.

앫 Verify no continuity between pins.

Measurements should read as follows:

Pins Circuit Measurement

1 Voltage Supply to Chassis Ground 8.0-16.0V

2 (Frame-mounted only) ESC

Ground to Chassis Ground

2 (Cab-mounted only) ESC Ground

to Chassis Ground

Less than 1 ohm resistance

Should have continuity but will not be less than 1 ohm

Figure 3.33

ESC Module Testing

Electrical Checks

For the following checks, all of the ECU connectors must be plugged in as well as the SAS. The ECU provides voltage, ground and CAN communication to ESC module.

앫 Take measurements at the ESC module harness connector.

Figure 3.34 and Figure 3.35.

앫 Measure voltage supply Key ON.

앫 Measure CAN High voltage Key ON.

3 and 4 Terminating Resistance between

ESC CAN-High to ESC CAN-Low

1 With ECU disconnected, check

Approximately 90 ohms

No continuity power supply for battery voltage or ground.

2 With ECU disconnected, check

No continuity ground for battery voltage or ground.

3 and 4 With ECU disconnected, check

No continuity CAN lines for battery voltage or ground.

3 CAN High Voltage to Chassis

2.5-5.0V

Ground

4 CAN Low Voltage to Chassis

0.1-2.4V

Ground

NOTE: Do not load test across power and ground at the ESC Module.

앫 Measure CAN Low voltage Key ON.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

3 Diagnostics, Troubleshooting and Testing

4012659a

ESC MODULE CONNECTOR

4007215a

CAB MOUNT ECU:

LOOKING INTO WIRE

HARNESS CONNECTOR

FRAME MOUNT ECU

WITH ESC:

LOOKING INTO WIRE

HARNESS CONNECTOR

3456

71012 911 8

131618 1517 14

X2-GREEN

Figure3.34

Figure 3.34

Figure3.35

ESC Module Mounting

The ESC module contains sensors which measure both lateral acceleration and yaw rate. Thus, it is critical that the module is securely mounted, leveled and in correct location to the vehicle and that the module is mounted as expected by the ECU and as per vehicle OEM specifications.

The module should be installed in a manner where the label is right side up. The module must be mounted perpendicular to the vehicle frame rails on a cross member or cross member bracket. The module connector could be facing the front or rear of the vehicle depending on the OEM’s specified mounting. It is critical that the unit be mounted in the exact location and manner as originally installed by the vehicle manufacturer. Figure 3.36.

Figure3.36

± 5°

-5°

+2°

-2°

Figure 3.35

ECU

Cab-Mounted

Universal with ESC

Frame-Mounted

With ESC

WABCO Maintenance Manual MM-0112 (Revised 07-18)

ESC Module

Circuit Connector Pins

Power Supply X4-18 pin 7

Ground X4-18 pin 10

ESC CAN-Low X4-18 pin 1

ESC CAN-High X4-18 pin 3

Power Supply X2-Green 9

Ground X2-Green External

ESC CAN-Low X2-Green 7

ESC CAN-High X2-Green 8

+2°

Figure 3.36

-2°

4010609a

ESC Information Available in WABCO TOOLBOX™ Software 11 or Higher

ESC Information can be accessed through WABCO TOOLBOX™ Software 11 or higher under Components, ESC.

To access the ESC Information:

앫 If you are using TOOLBOX™ Software version 11 or higher, click

on the “Components” button. A drop-box will appear. Select “ESC” then select “ESC Info”. Figure 3.37 and Figure 3.38.

3 Diagnostics, Troubleshooting and Testing

4010629a

4010630a

Figure3.37

Figure 3.37

Figure3.38

Steering Angle Sensor (SAS) Testing

Electrical Checks

The following tests are for WABCO SAS Only.

앫 Disconnect SAS and check terminating resistance across Pin 1

and Pin 2 of the SAS. Figure 3.39 and Figure 3.40.

For the following checks, all the ECU and ESC module connectors must be plugged in as the ECU provides all voltage, ground and CAN communications. Figure 3.42 and Figure 3.43.

앫 Take measurements at the SAS harness connector side.

Figure 3.41.

— Check Key On CAN Low voltage on Pin 1.

— Check Key On CAN High voltage on Pin 4.

— Check Key On Voltage Supply on Pin 5.

— Check Key Off resistance across CAN low Pin 1 and CAN

High Pin 4.

Location Measurement

Wabco SAS terminating resistor on sensor

CAN High Voltage 2.5-5.0V

Approximately 180 ohms

Figure 3.38

CAN Low Voltage 0.1-2.4V

Voltage Supply to Ground 8.0-16.0V

ESC CAN-High to ESC CAN-Low Approximately 90 ohm

SAS harness jumper (Pin 2 to

Continuity

Pin 4 or Pin 2 to Pin 3)

ESC CAN-High or CAN-Low to

No continuity Power or Ground (with ECU, ESC Module and SAS unplugged)

NOTE: For correct sensor operation, there must be a jumper wire on the harness side across either Pin 2 to Pin 3 or Pin 4 so terminating resistor is connected as shown in Figure 3.40.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

3 Diagnostics, Troubleshooting and Testing

4006873a

4010631a

CAN-HIGH

180 OHM

CAN-LOW

+U-BATT

GND

STEERING ANGLE SENSOR

4007216a

STEERING ANGLE SENSOR CONNECTOR

123456

Figure3.39

Figure 3.39

Figure3.40

Pin Circuit

1CAN-Low

2 Terminating Resistor

3CAN-High

4CAN-High

5Power

6 Ground

NOTE: Do not load test across power and ground at the SAS.

Figure3.42

BENDIX STEERING ANGLE SENSOR CONNECTOR

4 567

LOOKING INTO WIRE HARNESS CONNECTOR

4011908a

Figure 3.40

Figure3.41

Figure 3.41

Figure 3.42

Pin Circuit

1 Ground

2Power

3CAN-High

4CAN-Low

Figure3.43

CAB MOUNT ECU:

LOOKING INTO WIRE

HARNESS CONNECTOR

Figure 3.43

FRAME MOUNT ECU

WITH ESC:

LOOKING INTO WIRE

HARNESS CONNECTOR

X2-GREEN

3456

71012 911 8

131618 1517 14

4007215a

WABCO Maintenance Manual MM-0112 (Revised 07-18)

3 Diagnostics, Troubleshooting and Testing

4007214a

CAB MOUNT ECU’S:

LOOKING INTO WIRE HARNESS CONNECTOR

4007209a

FRAME MOUNT ECU

WITHOUT ESC:

LOOKING INTO WIRE

HARNESS CONNECTOR

FRAME MOUNT ECU

WITH ESC:

LOOKING INTO WIRE

HARNESS CONNECTOR

3456

710129118

X1-GRAY

3456

71012 911 8

X1-BLACK

131618 1517 14

ECU Circuit Testing

Electrical Checks

앫 Verify vehicle batteries, charging system and fuses are in good

working condition.

앫 Load test battery and ignition circuits to ground at the ECU

harness using a 2-4 amp sealed lamp and verify lamp does not flicker and it is on steady.

앫 Take measurements at the ECU harness pins. Figure 3.44 and

Figure 3.45.

Measurements should read as follows:

Location Measurement

Supply Voltage, Battery to chassis Ground

Supply Voltage, Ignition to chassis Ground

ECU ground to chassis ground Less than 1 ohm resistance

Main ground to chassis ground Less than 1 ohm resistance

9.0-16.0V for 12V system

18.0-32.0V for 24V system

9.0-16.0V for 12V system

18.0-32.0V for 24V system

Power Supply

ECU

Cab-Mounted

Universal with ESC, Universal or Basic

Circuit Connector Pins

Supply Voltage,

X1-15 pin 8

Battery

Supply Voltage,

X1-15 pin 7

Ignition

Central Ground X1-15 pin 4, 9

Frame-Mounted

Non-ESC

Supply Voltage, Battery (Could be

X1-Gray 1

IGN)

Supply Voltage,

X1-Gray 2

Ignition

Central Ground X1-Gray 11, 12

Frame-Mounted

With ESC

Supply Voltage, Battery

Supply Voltage,

X1-Black 1

X1-Black 2

Ignition

Central Ground X1-Black 13, 14

J1939 Serial Communications Testing

Figure3.44

Figure 3.44

Figure3.45

Figure 3.45

Electrical Checks

앫 If the ABS ECU is the only ECU on the J1939 datalink which

cannot communicate, then take measurements at the ABS ECU connector. If other ECUs are not communicating, then troubleshoot the vehicle datalink backbone and contact the vehicle OEM for technical assistance if required.

앫 Check for devices that could be overloading the J1939 datalink

slowing down communications.

앫 Verify J1939 High and Low have correct voltage readings, Key

ON, while datalink communications are active.

앫 For resistance measurements, the vehicle battery must be

disconnected and the ignition must be OFF. Figure 3.46, Figure 3.47, Figure 3.48 and Figure 3.49.

Measurements should read as follows:

Location Measurement

Across J1939 High and Low Approximately 60 ohms

J1939 Low voltage 0.1V-2.4V

J1939 High voltage 2.5V-5.0V

J1939 High or J1939 Low to Ground or Power Supply

WABCO Maintenance Manual MM-0112 (Revised 07-18)

No continuity

3 Diagnostics, Troubleshooting and Testing

4007373a

CAB MOUNT ECU’S

LOOKING INTO WIRE HARNESS CONNECTOR

4007374a

FRAME MOUNT ECU

WITHOUT ESC

LOOKING INTO WIRE

HARNESS CONNECTOR

FRAME MOUNT ECU

WITH ESC

LOOKING INTO WIRE

HARNESS CONNECTOR

3456

710129118

X1-GRAY

3456

71012 911 8

X1-BLACK

131618 1517 14

4012026a

CAB MOUNT ECU’S

LOOKING INTO WIRE HARNESS CONNECTOR

Figure3.46

Figure 3.46

Figure3.47

Figure 3.47

ECU

Cab-Mounted

All

J1939 Datalink

Circuit Connector Pins

J1939 High X1-15 pin 3

J1939 Low X1-15 pin 1

J1587 Datalink

ECU

Frame-Mounted ECU with ESC

Figure3.48

Figure 3.48

Figure3.49

FRAME MOUNT ECU

WITHOUT ESC

LOOKING INTO WIRE

HARNESS CONNECTOR

710129118

Figure 3.49

J1939 High X1-Black 4

J1939 Low 16

X1-GRAY

3456

Circuit Connector Pins

FRAME MOUNT ECU

WITH ESC

LOOKING INTO WIRE

HARNESS CONNECTOR

X1-BLACK

3456

71012 911 8

131618 1517 14

4012027a

Frame-Mounted

Without ESC

Frame-Mounted

With ESC

J1939 High X1-Gray 7

J1939 Low X1-Gray 6

J1939 High X1-Black 18

J1939 Low X1-Black 6

J1587 Datalink

ECU

Circuit Connector Pins

Cab-Mounted ECU J1939 High X1 11

J1939 Low 10

Frame-Mounted ECU without ESC

WABCO Maintenance Manual MM-0112 (Revised 07-18)

J1939 High X1-Gray 4

J1939 Low 9

4 Component Replacement

WARNING

CAUTION

WARNING

4004479a

SENSOR

SPRING

CLIP

WHEEL SPEED SENSOR

4 Component Replacement

Hazard Alert Messages

Read and observe all Warning and Caution hazard alert messages in this publication. They provide information that can help prevent serious personal injury, damage to components, or both.

To prevent serious eye injury, always wear safe eye protection when you perform vehicle maintenance or service.

Release all air from the air systems before you remove any components. Pressurized air can cause serious personal injury.

When welding on an ABS- or ABS/ATC-equipped vehicle is necessary, disconnect the power connector from the ECU to prevent damage to the electrical system and ABS/ATC components.

Component Removal and Installation

Figure4.1

Figure 4.1

Removal

NOTE: When replacing the wheel speed sensor, the sensor spring

clip must also be replaced.

Wheel Speed Sensors

Sensor Lubricant Specification

WABCO specifications call for a sensor lubricant with the following characteristics:

Lubricant must be mineral oil-based and contain molydisulfide. It should have excellent anti-corrosion and adhesion characteristics, and be capable of continuous function in a temperature range of

−40° to 300°F (−40° to 150°C).

Lubricants approved for use on WABCO sensors and spring clips are as follows. Figure 4.1.

앫 Mobilith SHC-220 (Mobil)

앫 TEK 662 (Roy Dean Products)

앫 Staburags NBU 30 PTM (Kluber Lubrication)

앫 Valvoline EP 633

Park the vehicle on a level surface. Block the wheels to prevent the vehicle from moving. Support the vehicle with safety stands. Do not work under a vehicle supported only by jacks. Jacks can slip and fall over. Serious personal injury and damage to components can result.

1. Place blocks under the tires to stop the vehicle from moving. Apply the parking brake.

2. If necessary, raise the tires off the ground. Place safety stands under the axle.

3. Depending on the axle, wheel hub and brake configurations, some components might have to be removed to obtain access to wheel speed sensor. Follow the vehicle OEMs guidelines to gain access to wheel speed sensor.

4. Disconnect the fasteners that hold the sensor cable to other components.

5. Disconnect the sensor cable from the chassis harness.

6. Remove the sensor from the sensor holder. Use a twisting motion if necessary. Do not pull on the cable. Figure 4.2 and Figure 4.3.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

4 Component Replacement

WARNING

1002036a

KNUCKLE-MOUNTED SENSOR

1002037a

SENSOR HOLDER

SPRING CLIP

SPRING

CLIP TAB

SENSOR

Figure4.2

Figure 4.2

Installation

1. Connect the sensor cable to the chassis harness.

2. Install the fasteners used to hold the sensor cable in place.

3. Apply a WABCO recommended lubricant to the sensor spring clip and sensor.

4. Install the sensor spring clip. Make sure the spring clip tabs are on the inboard side of the vehicle.

5. Push the sensor spring clip into the bushing in the steering knuckle until the clip stops.

6. Push the sensor completely into the sensor spring clip until it contacts the tooth wheel.

NOTE: After installation, there should be no gap between the sensor and the tooth wheel. During normal operation, a gap of up to 0.04-inch (1.016 mm) is allowable.

7. Remove the blocks and safety stands.

Modulator Valves

Figure4.3

Figure 4.3

7. Remove the sensor spring clip.

Removal

Park the vehicle on a level surface. Block the wheels to prevent the vehicle from moving. Support the vehicle with safety stands. Do not work under a vehicle supported only by jacks. Jacks can slip and fall over. Serious personal injury and damage to components can result.

1. Turn the ignition switch to the OFF position. Apply the parking brake.

2. Place blocks under the front and rear tires to stop the vehicle from moving.

3. If necessary, raise the vehicle off the ground and place safety stands under the axle.

4. Disconnect the wiring connector from the ABS valve.

5. Disconnect the air lines from Ports 1 (air supply) and 2 (air discharge) of the ABS valve. Figure 4.4.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

4 Component Replacement

CAUTION

WARNING

1002038a

PORT 1,

AIR IN

PORT 2,

AIR OUT

Figure4.4

Figure 4.4

6. Remove the two mounting capscrews and nuts.

7. Remove the ABS valve.

Installation

Moisture can affect the performance of all ABS/ATC systems, as well as the standard braking system. Moisture in air lines can cause air lines to freeze in cold weather.

3. After any repair has been performed, cycle the ignition key and test drive the vehicle. Verify that the ABS indicator lamp operates correctly.

Active Braking Valves (ABV)

Removal

Depending on the OEM specs and vehicle system configuration, ABVs may be located near the rear axle, front axle and in line with trailer service/control line. Consult the vehicle OEM for exact location of these valves.

Park the vehicle on a level surface. Block the wheels to prevent the vehicle from moving. Support the vehicle with safety stands. Do not work under a vehicle supported only by jacks. Jacks can slip and fall over. Serious personal injury and damage to components can result.

1. Turn the ignition switch to the OFF position. Apply the parking brake.

2. Place blocks under the front and rear tires to stop the vehicle from moving.

3. If necessary, raise the vehicle off the ground. Place safety stands under the axle.

1. Install the ABS valve with two mounting capscrews and nuts. Tighten the capscrews per the manufacturer’s recommendation.

2. Connect the line to the brake chambers to Port 2 of the ABS valve. Connect the air supply line to Port 1 of the ABS valve.

3. Connect the wiring connector to the ABS valve. Hand tighten only.

4. Remove the blocks and stands.

5. Test the installation.

Checking the Installation

1. Apply the brakes. Listen for leaks at the modulator valve.

2. Turn the ignition on and listen to the modulator valve cycle. If the valve fails to cycle, check the electrical cable connection. Make repairs as needed.

Relieve line pressure by bleeding the air from the appropriate supply tank. Pressurized air can cause serious personal injury.

4. Disconnect the wiring from the valve.

5. Disconnect the air lines from Port 1 (air supply), Port 2 (air discharge) and Port 3 (treadle) of the ATC valve. Figure 4.5.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

4 Component Replacement

WARNING

1002039a

AIR

LINES

PORT 1, AIR SUPPLY

AIR LINE

PORT 3,

TREADLE

VALVE CONTROL

DO NOT OPEN

PORT 2,

AIR DISCHARGE

Figure4.5

Figure 4.5

6. Remove the two mounting capscrews and nuts. Remove the valve.

Installation

1. Install the valve with two mounting capscrews and nuts. Tighten the capscrews per the manufacturer’s recommendation.

2. Connect the air supply, discharge and treadle lines to Ports 1, 2 and 3 of the valve.

3. Connect the harness connector to the valve. Hand tighten only.

9. Drive the vehicle. Verify that the ATC indicator lamp operates correctly.

Checking the Trailer ABV Installation

1. Connect the blue glad hand to a 50 cu. in. (819 cu. cm) air tank.

2. Start the vehicle.

3. Fully charge the reservoirs with air. Shut off the vehicle.

4. Activate the valve using TOOLBOX™ Software; verify correct operation and no active codes.

5. Listen for air leaks at the valve.

6. Make necessary repairs if needed.

7. Turn the ignition ON. Verify that the ATC/Stability Control indicator lamp operates correctly.

ABS Valve Packages

Removal and Installation — Complete Package

Park the vehicle on a level surface. Block the wheels to prevent the vehicle from moving. Support the vehicle with safety stands. Do not work under a vehicle supported only by jacks. Jacks can slip and fall over. Serious personal injury and damage to components can result.

4. Remove the blocks and stands.

5. Test the installation.

Checking the ABV Installation

To test the active braking valve:

1. Turn the ignition to the ON position and verify that the ATC/ Stability Control lamp operates correctly.

2. Start the vehicle.

3. Fully charge the reservoirs with air. Shut off the vehicle.

4. Apply the brakes.

5. Listen for air leaks at the valve.

6. Release the brakes.

7. Activate the valve using TOOLBOX™ Software. Verify correct

operation and that there are no active codes.

8. Make necessary repairs if needed.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

Relieve line pressure by bleeding the air from the appropriate supply tank. Pressurized air can cause serious personal injury.

1. Place blocks under tires to stop the vehicle from moving.

2. If necessary, raise the tires off the ground.

3. Drain the air from all system air tanks.

4. Remove all the air lines and connections from the ABS valve package. Figure 4.6 and Figure 4.7.

4 Component Replacement

4007847a

472 500 30. 0

MADE IN GERMANY

001 20/98

SUPPLY PORT

1/2" NPT

QUICK RELEASE VA LV E

1/2" NPT

DELIVERY

PORTS

MODULATOR

VA LV E

ABS QUICK RELEASE VALVE PACKAGE

4007848a

ABS

MODULATOR

VA LV E

RELAY VA LV E

CONTROL PORT 1/4" NPT

ABS

MODULATOR

VA LV E

DELIVERY

PORTS

1/2" NPT

DELIVERY

PORTS

1/2" NPT

SUPPLY

PORT

1/2" NPT

DELIVERY

PORTS

3/8" NPT

ABS RELAY VALVE PACKAGE

xxxxx xxxxx

xxxxx xxxxxxxxxx xxxxx

1002041c

472 500 30. 0

MADE IN GERMANY

001 20/98

ALLEN-HEAD BOLTS

13-15 LB-FT (18-20 N•m)

Figure4.6

Figure 4.6

Figure4.7

Removal and Installation — Component Valves

1. Remove the ABS valve package from the vehicle. Figure 4.8.

Figure4.8

Figure 4.8

Figure 4.7

5. Remove the mounting bolts from the valve package. Remove the valve package from the vehicle.

6. Replace the ABS valve package: Tighten the bolts to the vehicle manufacturer’s recommendation. Remove the blocks

and safety stands as necessary.

7. Test the installation.

2. Use a 6 mm Allen wrench to loosen and remove the Allen-head bolts.

3. Carefully separate the ABS modulator valve(s) from the relay or quick release valve.

4. Remove and discard old O-rings. Lubricate replacement O-rings with the grease provided.

5. Plug any unused ports on the replacement valve(s).

6. Attach the ABS modulator valve(s) to the relay or quick release valve. Use a 6 mm Allen wrench to tighten the Allen-head bolts to 13-15 lb-ft (18-20 N폷m).

7. Replace the ABS valve package: Tighten the bolts to the vehicle manufacturer’s recommendation. Remove the blocks and safety stands as necessary.

8. Check the valves for leaks:

앫 Modulator valve(s). Refer to the procedure for checking the

modulator valve installation in this section.

앫 Relay or quick release valve. Refer to the procedure for

checking the quick release or relay valve installation in this section.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

4 Component Replacement

WARNING

Active Braking Valve on the ABS Valve Package

Removal

NOTE: If there is enough room to work, it is not necessary to

remove the valve package from the vehicle before replacing the active braking valve (solenoid valve). If the valve package must be removed, follow the instructions for removing and replacing the ABS Valve Package that appear in this section of the manual.

Relieve line pressure by bleeding air from the appropriate supply tank. Pressurized air can cause serious personal injury.

When installing the new active braking valve (solenoid valve) on the valve package, you must use the new O-rings, seals, mounting bolts and lubricant included with the replacement kit.

1. Turn the ignition switch to the OFF position. Apply the parking brake.

2. Place blocks under the front and rear tires to stop the vehicle from moving.

Figure4.9

ADAPTER

Figure 4.9

MOUNTING BOLTS

SUPPLY

AIR LINE

ACTIVE

BRAKING VALVE

(SOLENOID VALVE)

TREADLE

AIR LINE

SEAL

O-RINGS

4007849a

Installation

1. Clean and lubricate the small adapter piece O-ring. Install the O-ring on the adapter piece.

3. If necessary, raise the vehicle off the ground. Place safety stands under the axle.

Relieve line pressure by bleeding the air from the appropriate supply tank. Pressurized air can cause serious personal injury.

4. Disconnect the wiring from the solenoid valve.

5. Disconnect the supply air line from the adapter and the treadle air line from the solenoid valve.

6. Use a 5 mm Allen wrench to remove the two screws that hold the adapter piece to the relay valve portion of the valve package.

7. Use a 6 mm Allen wrench to remove the two mounting bolts that hold the solenoid valve to the adapter piece. Remove the solenoid valve from the adapter piece. Remove the solenoid valve.

8. Remove the adapter piece, seal and O-rings from the valve package. Figure 4.9.

2. Use the two new M8 Allen-head bolts to attach the solenoid valve to the adapter piece. Use a 6 mm Allen-head tool to tighten to 13-15 lb-ft (18-20 N폷m). Figure 4.10.

Figure4.10

O-RING

ADAPTER

Figure 4.10

MOUNTING BOLTS

12-13 FT-LB (18-20 N m)

•

BRAKING VALVE

(SOLENOID VALVE)

ACTIVE

SEAL

4007850a

WABCO Maintenance Manual MM-0112 (Revised 07-18)

4 Component Replacement

WARNING

xxxx xxxxx

xxxxx xxxxx

1002044a

RELAY VALVE

SUPPLY PORT

1002045a

MOUNTING BOLTS

4-5 LB-FT (6-8 N•m)

O-RING

(INSTALLED)

SUPPLY

PORT

ATC VALVE

AND ADAPTER

CONTROL

PORT

ABS VALVE

PACKAGE

3. Lubricate the replacement seal and install it in Port 2 of the solenoid valve.

4. Lubricate the large replacement O-ring and install it in the groove of the relay valve supply port. Figure 4.11.

Figure4.11

Figure 4.11

NOTE: Use WABCO-recommended lubricant.

5. Use the two M6 Allen-head bolts to attach the adapter to the relay valve. Use a 5 mm Allen-head tool to tighten to 4-5 lb-ft (6-8 N폷m). Figure 4.12.

Figure4.12

8. Attach the wiring connector to the solenoid valve. Hand tighten only.

9. Remove the blocks and stands.

10. Test the installation.

Checking the Installation

1. Start the vehicle.

2. Fully charge the reservoirs with air. Shut off the vehicle.

3. Apply the brakes.

4. Listen for air leaks at all valves.

5. Drive the vehicle. Verify that the ABS indicator lamp operates correctly.

Electronic Control Unit (ECU)

Removal

Figure 4.12

6. Connect the supply air line to the supply port on the adapter.

7. Connect the treadle air line to the control port on the solenoid valve. Place a wrench on the adapter to prevent the control port from twisting. Tighten the fitting to 15 ft-lb (20 N폷m). Do not over tighten.

1. Turn the ignition switch to the OFF position. Apply the parking brake.

2. Place blocks under the front and rear tires to prevent the vehicle from moving.

3. Disconnect the wiring harness connectors from the ECU.

4. Remove the mounting hardware. Remove the ECU. Figure 4.13.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

4 Component Replacement

WARNING

Figure4.13

UNIVERSAL

ECU

Figure 4.13

FRAME-MOUNTED

BASIC

ECU

4003974a

Installation

1. Install the ECU using the manufacturer’s mounting hardware. Tighten the hardware per the manufacturer’s recommendation.

2. Install the wiring harness connectors to the ECU.

3. Remove the blocks.

4. Test the installation.

앫 When the ESC End of Line Calibration Procedure is

completed, the ABS and ATC/ESC lamps should come on and go back off when ignition power is turned on. The ATC/ ESC lamp may remain on briefly after the ABS lamp goes off.

3. There should not be any active faults displayed in the ECU memory.

Steering Angle Sensor (SAS) — WABCO Only

Removal

If equipped, disable the supplemental restraint system (air bag) to avoid serious personal injury. Refer to the vehicle manufacturer’s service publication for further information.

NOTE: If ECU has roll stability control (RSC), mounting of the

ECU is crucial for proper operation due to internal accelerometer. Note the location installation of the ECU before removal. After installing ECU, verify the ECU is properly leveled and securely mounted on the right location as per OEM specs. See Section 2 RSC components for further information.

Testing the Installation

To test the ECU installation:

1. Turn the ignition ON and verify that the ABS self test and ABS light comes on and goes off.

앫 Wheel speed related faults require a vehicle speed over 4

mph before the ABS light turns off and the code clears.

2. Use TOOLBOX™ Software to verify system has no active faults.

앫 ECUs with Electronic Stability Control (ESC) will require

system to be calibrated whenever a component has been replaced.

앫 Follow the ESC End of Line Calibration Procedure described

in this manual.

1. Center the steering wheel with the front wheels positioned straight ahead.

2. Turn the ignition switch to the OFF position. Apply the parking brake.

3. Place blocks under the front and rear tires to prevent the vehicle from moving.

4. Locate the SAS on the steering column shaft, either near the universal joint on the bottom of the column or under the steering wheel near the top of the column.

5. If the SAS is located at the top of the steering column, remove the vehicle steering wheel using the recommended steering wheel puller.

6. The SAS is attached by three screws to the steering column with the center tab located in the grooved steering column shaft. Figure 4.14.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

4 Component Replacement

CAUTION

WARNING

4006873a

Figure4.14

Figure 4.14

7. Disconnect the wiring harness connector from the SAS. (Note the position of the connector either facing up or down.)

8. Remove the attaching screws and slide the SAS off of the steering column shaft.

Installation

If the SAS is not installed in the correct orientation, it will not function correctly and may become damaged.

1. Apply a small amount of the supplied grease to the tab in the center of the SAS and to the machined groove on the steering shaft.

2. When the ESC End of Line Calibration Procedure is completed, the ABS and ATC/ESC lamps should come on and go back off when ignition power is turned on. The ATC/ESC lamp may remain on briefly after the ABS lamp goes off.

3. There should not be any active faults displayed in the ECU memory.

Electronic Stability Control (ESC) Module

Removal

Park the vehicle on a level surface. Block the wheels to prevent the vehicle from moving. Support the vehicle with safety stands. Do not work under a vehicle supported only by jacks. Jacks can slip and fall over. Serious personal injury and damage to components can result.

1. Turn the ignition switch to the OFF position. Apply the parking brake.

2. Place blocks under the front and rear tires to prevent the vehicle from moving.

3. If necessary, raise the vehicle off the ground and place safety stands under the vehicle.

4. Disconnect the wiring harness connector from the ESC module. Figure 4.15 and Figure 4.16.

2. Install the SAS with the connector facing the same direction as the original. Place the SAS over the steering column shaft and slide it into place with the SAS tab placed in the groove that is machined on the steering column shaft.

3. Using the new furnished screws, replace the attaching screws and tighten to a maximum of 22 in-lb (2.5 N폷m).

4. Install the SAS wiring harness connector by pushing the connector together until the small tab snaps into place.

5. Install the steering wheel and tighten per the manufacturer’s recommendation.

6. Remove the blocks.

7. Test the installation.

Test the Installation

To test the SAS installation, the system must be calibrated.

1. Follow the ESC End of Line Calibration Procedure described in this manual.

Figure4.15

Figure 4.15

WARNING

DO NOT MOVE OR RELOCATE

4010604a

WABCO Maintenance Manual MM-0112 (Revised 07-18)

4 Component Replacement

WARNING

4010609a

± 5°

-5°

+2°

-2°

+2°

-2°

Figure4.16

Figure 4.16

5. Remove the two mounting capscrews and nuts. Remove the ESC module.

NOTE: ESC modules are installed by the OEM close to the vehicle center of gravity. Depending on the vehicle manufacturer, the ESC module might face towards the front of the vehicle or rear. For correct operation and the best performance, verify the ESC module is correctly leveled and securely mounted as per OEM specs. Do not move the module to a different location as this will affect the system performance.

1. Follow the ESC End of Line Calibration Procedure described in this manual.

3. There should not be any active faults displayed in the ECU memory.

Brake Pressure Sensor

Removal

Park the vehicle on a level surface. Block the wheels to prevent the vehicle from moving. Support the vehicle with safety stands. Do not work under a vehicle supported only by jacks. Jacks can slip and fall over. Serious personal injury and damage to components can result.

1. Turn the ignition switch to the OFF position. Apply the parking brake.

2. Place blocks under the front and rear tires to prevent the vehicle from moving.

3. If necessary, raise the vehicle off the ground and place safety stands under the vehicle.

Installation

NOTE: It is important that the module is aligned correctly and

the tab on the ESC mounting surface fits into the appropriate hole.

1. Install the ESC module with the two capscrews and nuts. Tighten the capscrews per the manufacturer’s recommendation.

2. Connect the wiring harness connector to the ESC module. Hand tighten only.

3. Remove the stands and blocks.

4. Test the installation.

Test the Installation

To test the ESC module installation, the system must be calibrated.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

Relieve line pressure by bleeding the air from the appropriate supply tank. Pressurized air can cause serious personal injury.

4. Disconnect the wiring harness connector from the brake pressure sensor. Figure 4.17.

Figure4.17

27 FT-LB

(36.6 Nm)

TORQUE

4006870a

Figure 4.17

5. Disconnect the air line or unscrew the brake pressure sensor from the air line fitting.

6. Remove the brake pressure sensor.

Installation

1. Connect the brake pressure sensor to the air line or attach the sensor to the air line fitting.

2. Connect the wiring harness connector to the brake pressure sensor. Hand tighten only.

3. Remove the stands and blocks.

4. Test the installation.

Test the Installation

To test the brake pressure sensor:

1. Turn the ignition on and verify that the ATC/ESC lamp operates correctly.

4 Component Replacement

2. Start the vehicle and fully charge the reservoirs with air. Shut off the vehicle.

3. Apply the brakes and check for air leaks at the brake pressure sensor.

4. There should not be any active faults displayed in the ECU memory.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

5 System Configurations

1003364e

LAMPS

VALVE PACKAGE

INSTALLATION (REAR)

6S/4M ABS

AIR LINES ELECTRICAL LINES

VALVE PACKAGE

INSTALLATION (FRONT)

1003366e

AIR LINES ELECTRICAL LINES

VALVE PACKAGE

INSTALLATION (REAR)

4S/4M ABS/ATC

LAMPS

AT C VA LV E

VALVE PACKAGE

INSTALLATION (FRONT)

5 System Configur ations

System Configuration Layouts

The most common configurations are shown in this section. Always refer back to the vehicle OEM for the correct configuration of your vehicle.

Refer to Figure 5.1, Figure 5.2, Figure 5.3, Figure 5.4, Figure 5.5, Figure 5.6 and Figure 5.7 for system configuration layouts.

Figure5.1

STANDARD OR BASIC 4S/4M ABS

VALVE PACKAGE

INSTALLATION (REAR)

LAMPS

VALVE PACKAGE

INSTALLATION (FRONT)

AIR LINES ELECTRICAL LINES

1003363e

Figure5.3

6S/6M ABS

LAMPS

VALVE PACKAGE

INSTALLATION (FRONT)

AIR LINES ELECTRICAL LINES

Figure 5.3

Figure5.4

VALVE PACKAGE

INSTALLATION (REAR)

1003365e

Figure 5.1

Figure5.2

Figure 5.2

Figure 5.4

WABCO Maintenance Manual MM-0112 (Revised 07-18)

5 System Configurations

1003367e

AIR LINES ELECTRICAL LINES

VALVE PACKAGE

INSTALLATION (REAR)

6S/4M ABS/ATC

LAMPS

AT C VA LV E

VALVE PACKAGE

INSTALLATION (FRONT)

4007813b

VALVE PACKAGE

INSTALLATION

(REAR)

AIR LINES ELECTRICAL LINES

4S/4M RSC/ATC

(ALSO AVAILABLE IN 6S CONFIGURATIONS)

VALVE PACKAGE

INSTALLATION

(FRONT)

LAMPS

TRAILER

ACTIVE

BRAKING

VA LV E

TRAILER STABILITY

CONTROL

MODULATOR

(OPTIONAL)

PRESSURE

SENSOR

(OPTIONAL)

AT C VA LV E

FRONT AXLE ACTIVE BRAKING VA LV E (OPTIONAL)

TRACTOR

PROTECTION

VA LV E

Figure5.5

Figure 5.5

Figure5.6

Figure5.7

4S/4M ESC/ATC

(ALSO AVAILABLE IN 6S CONFIGURATIONS)

TRACTOR

TRAILER

ACTIVE

BRAKING

VA LV E

ESC

MODULE

Figure 5.7

TRAILER STABILITY

CONTROL

MODULATOR

(OPTIONAL)

LAMPS

PRESSURE

SENSOR

AIR LINES ELECTRICAL LINES

PROTECTION VALVE

VALVE PACKAGE

INSTALLATION

(REAR)

AT C VA LV E

SAS

FRONT AXLE ACTIVE BRAKING VA LV E

4007814b

Figure 5.6

WABCO Maintenance Manual MM-0112 (Revised 07-18)

6 Wiring Diagrams and Connectors

BASIC

4004024b

UNIVERSAL

4004025b

101113

X1X4

4007395b

UNIVERSAL ECU (CAB-MOUNTED) WITH 4 CONNECTORS

6 Wiring Diagrams and Connector s

ECU Connector Pin Assignments

Refer to Figure 6.1, Figure 6.2, Figure 6.3, Figure 6.4, Figure 6.5, Figure 6.6, Figure 6.7, Figure 6.8, Figure 6.9, Figure 6.10, Figure 6.11, Figure 6.12, Figure 6.13, Figure 6.14, Figure 6.15 and Figure 6.16 for ECU wiring diagrams.

Figure6.1

BASIC ECU (CAB-MOUNTED)

Figure 6.1

Figure6.2

UNIVERSAL ECU (CAB-MOUNTED)

Figure 6.2

Figure6.3

UNIVERSAL ECU (CAB-MOUNTED) WITH 4 CONNECTORS

Figure 6.3

WABCO Maintenance Manual MM-0112 (Revised 07-18)

ECU (Frame-mounted)

X2-BLACK

11 2

10 3

12 1

X1-GRAY

12 1

11 2

10 3

X3-GREEN

X4-BROWN

(ONLY FOR 6 CHANNEL)

11 2

10 3

12 1

11 2

10 3

4004026a

4007396b

FRAME MOUNT ECU WITH ESC AND/OR HSA

X4-BROWN

(ONLY FOR 6 CHANNEL)

3 4 56

710129118

12 3 4 56

710129118

X1-BLACK

X3-GREEN

13 16 1815 1714

3 4 56

710129118

12 3 4 56

710129118

13 16 1815 1714

X2-GREEN

Figure6.4

FRAME-MOUNTED ECU

Figure 6.4

ECU (Frame-mounted) with ESC and/or HSA

6 Wiring Diagrams and Connectors

Figure6.5

Figure 6.5

WABCO Maintenance Manual MM-0112 (Revised 07-18)

6 Wiring Diagrams and Connectors

BACK VIEW OF HARNESS CONNECTOR

INLET

VALV E

INLET

VALV E

INLET VALV E

OUTLET

VALV E

OUTLET

VALV E

OUTLET

VALV E

OUTLET

VALV E

INLET VALV E

ABV-

SENSOR

2 1

5 4

8 7

11 10

14 13

SENSOR

SENSOR ABV+

17 16

18 PIN CONNECTOR

SENSOR 10 SENSOR 13 SENSOR 11 SENSOR 14 SENSOR 12 SENSOR 15 ABV+ 16 SENSOR 17 SENSOR 18

INLET VALV E OUTLET VALV E INLET VALV E OUTLET VALV E INLET VALVE OUTLET VALV E ABVINLET VALV E OUTLET VALV E

RIGHT FRONT ABS VALVE

LEFT FRONT ABS VALVE

LEFT REAR ABS VALVE

RIGHT REAR ABS VALVE

RIGHT FRONT SENSOR

LEFT REAR SENSOR

LEFT FRONT SENSOR

RIGHT REAR SENSOR

GND

REAR

ABV

16 AWG

GND*

BACK VIEW OF HARNESS CONNECTOR

SAE

J1939

TR-WL

SAE

J1939

ATC

ABS ECU-

GND

BAT ECU+

JUMPER

SAE

J1587

SAE

J1587

ABS

LAMP

3RD BRK

ATC

LAMP

2 1

5 4

8 7

11 10

14 13

14 PIN CONNECTOR

TRAILER INDICATOR LAMP

J1939 L

J1939 H

15A AMP

5A AMP

14 AWG

BAT

J1587 B

J1587 A

ATC

SWITCH

J1587 B J1587 A J1939 L J1939 H BATTERY ECU+

RETARDER TRAILER

INDICATOR LAMP

ATC LAMP TRACTOR

INDICATOR LAMP

ATC SWITCH ABS OFF

ROAD ECUGND

1 3 8 7

13 15

6 5

ATC LAMP

TRACTOR INDICATOR LAMP

BLINK CODE

SWITCH

ABS OFF ROAD SWITCH

87A

IGN

RETARDER

4004027d

*All connected to a common star ground.

Basic ECU ABS Only with Optional Automatic Traction Control (ATC) (Cab-mounted)

Figure6.6

Figure 6.6

WABCO Maintenance Manual MM-0112 (Revised 07-18)

6 Wiring Diagrams and Connectors

BACK VIEW OF HARNESS CONNECTOR

SAE

J1939

TR-WL

SAE

J1939

ATC

ABS ECU-

GND

BAT ECU+

JUMPER

SAE

J1587

SAE

J1587

ABS

LAMP

3RD BRK

ATC

LAMP

2 1

5 4

8 7

11 10

14 13

14 PIN CONNECTOR

TRAILER INDICATOR LAMP

J1939 L

J1939 H

15A AMP

10 AMP

14 AWG

BAT

IGN

J1587 B

J1587 A

INLET

VALV E

INLET

VALV E

INLET

VALV E

OUTLET

VALV E

OUTLET

VALV E

OUTLET

VALV E

OUTLET

VALV E

INLET VALV E

ABV-

SENSOR SENSOR SENSOR

3 2 1

6 5 4

9 8 7

12 11 10

15 14 13

SENSOR SENSOR ABV+

18 17 16

18 PIN CONNECTOR

SENSOR 10 SENSOR 13 SENSOR 11 SENSOR 14 SENSOR 12 SENSOR 15 ABV+ 16 SENSOR 17 SENSOR 18

INLET VALV E OUTLET VALV E INLET VALV E OUTLET VALV E INLET VALVE OUTLET VALV E ABVINLET VALV E OUTLET VALV E

RIGHT FRONT ABS VALVE

LEFT FRONT ABS VALVE

LEFT REAR ABS VALVE

RIGHT REAR ABS VALVE

RIGHT FRONT SENSOR

LEFT REAR SENSOR

LEFT FRONT SENSOR

RIGHT REAR SENSOR

ATC

SWITCH

GND

REAR

ABV

BACK VIEW OF HARNESS CONNECTOR

INLET VALV E

SENSOR

AUX 1

OUTLET

VALV E

SENSOR AUX 2

NOT

USED

TRL

ABV-

AUX 3

INLET VALV E

SENSOR

AUX 4

OUTLET

VALV E

SENSOR

TRL

ABV+

2 1

5 4

8 7

11 10

14 13

15 PIN CONNECTOR

3RD AXLE LEFT SENSOR

NOT USED 9

SENSOR 2

SENSOR 5

INLET 3

OUTLET 6

SENSOR 11

SENSOR 14

INLET 12

OUTLET 15

J1587 B J1587 A J1939 L J1939 H BATTERY ECU+

RETARDER TRAILER

INDICATOR LAMP ATC LAMP TRACTOR

INDICATOR LAMP

ATC SWITCH ABS OFF

ROAD ECUGND

10 11

1 3 8 7

13 15

6 5

GND*

ATC LAMP

TRACTOR INDICATOR LAMP

BLINK CODE

SWITCH

ABS OFF ROAD SWITCH

14 AWG

16 AWG

87A

3RD AXLE RIGHT SENSOR

3RD AXLE LEFT ABS VALVE

3RD AXLE RIGHT ABS VALVE

GND

RETARDER

4004030i

6S/6M Universal ECU ABS Only with Optional Automatic Traction Control (ATC) (6S/4M and 4S/4M Configurations are also available)

Figure6.7

Figure 6.7

WABCO Maintenance Manual MM-0112 (Revised 07-18)

6 Wiring Diagrams and Connectors

BACK VIEW OF HARNESS CONNECTOR

TRL ABV-

TRL

ABV+

2 1

5 4

8 7

11 10

14 13

15 PIN CONNECTOR

TRAILER ABV

NOT USED 9

SENSOR 2

SENSOR 5

INLET 3

OUTLET 6

SENSOR 11

SENSOR 14

INLET 12

OUTLET 15

GND*

BACK VIEW OF HARNESS CONNECTOR

INLET

VALV E

INLET VALV E

OUTLET

VALV E

INLET VALV E

OUTLET

VALV E

NOT

USED

INLET

VALV E

OUTLET

VALV E

OUTLET

VALV E

OUTLET

VALV E

OUTLET

VALV E

INLET

VALV E

ABV-

AUX 1

AUX 2

AUX 3

AUX 4

SENSOR

2 1

5 4

8 7

11 10

14 13

SENSOR

ABV+

17 16

18 PIN CONNECTOR

SENSOR 10 SENSOR 13 SENSOR 11 SENSOR 14 SENSOR 12 SENSOR 15 ABV+ 16 SENSOR 17 SENSOR 18

INLET VALV E OUTLET VALV E INLET VALV E OUTLET VALV E INLET VALVE OUTLET VALV E ABVINLET VALV E OUTLET VALV E

RIGHT FRONT ABS VALVE

LEFT FRONT ABS VALVE

LEFT REAR ABS VALVE

RIGHT REAR ABS VALVE

RIGHT FRONT SENSOR

LEFT REAR SENSOR

LEFT FRONT SENSOR

RIGHT REAR SENSOR

GND

REAR

ABV

16 AWG

BACK VIEW OF HARNESS CONNECTOR

SAE

J1939

TR-WL

SAE

J1939

ATC

ABS ECU-

GND

BAT ECU+

JUMPER

SAE

J1587

SAE

J1587

ABS

LAMP

3RD BRK

ATC

LAMP

2 1

5 4

8 7

11 10

14 13

14 PIN CONNECTOR

TRAILER INDICATOR LAMP

J1939 L

J1939 H

15A AMP

5 AMP

14 AWG

BAT

IGN

J1587 B

J1587 A

ATC

SWITCH

J1587 B J1587 A J1939 L J1939 H BATTERY ECU+

RETARDER TRAILER

INDICATOR LAMP ATC LAMP TRACTOR

INDICATOR LAMP

ATC SWITCH ABS OFF

ROAD ECUGND

10 11

1 3 8 7

13 15

6 5

ATC/RSC LAMP

TRACTOR INDICATOR LAMP

BLINK CODE

SWITCH

ABS OFF ROAD SWITCH

14 AWG

87A

RETARDER

4004030j

Momentary Switch

Optional Equipment

Twisted Pair = TP All unmarked wires should be 16 or 18 AWG. All fuses should be blade type. *All connected to a common star ground.

TRL ABV- 8

TRL ABV+ 13

3RD AXLE LEFT SENSOR

16 AWG

3RD AXLE RIGHT SENSOR

3RD AXLE LEFT ABS VALVE

3RD AXLE RIGHT ABS VALVE

GND

6S/6M Universal ECU with Roll Stability Control (RSC) (6S/4M and 4S/4M Configurations are also available)

Figure6.8

Figure 6.8

WABCO Maintenance Manual MM-0112 (Revised 07-18)

6 Wiring Diagrams and Connectors

BACK VIEW OF HARNESS CONNECTOR

2 1

5 4

8 7

11 10

14 13

15 PIN CONNECTOR

TRAILER ABV

TRL ABV- 8

TRL ABV+ 13

NOT USED 9

SENSOR 2

SENSOR 5

INLET 3

OUTLET 6

SENSOR 11

SENSOR 14

INLET 12

OUTLET 15

GND*

BACK VIEW OF HARNESS CONNECTOR

INLET

VALV E

INLET

VALV E

INLET

VALV E

OUTLET

VALV E

INLET

VALV E

INLET

VALV E

OUTLET

VALV E

OUTLET

VALV E

NOT

USED

TRL

ABV-

TRL

ABV+

OUTLET

VALV E

OUTLET

VALV E

OUTLET

VALV E

INLET

VALV E

ABV-

SENSOR

2 1

5 4

8 7

11 10

14 13

SENSOR

AUX 1

AUX 2

AUX 3

AUX 4

SENSOR

ABV+

17 16

18 PIN CONNECTOR

SENSOR 10 SENSOR 13 SENSOR 11 SENSOR 14 SENSOR 12 SENSOR 15 ABV+ 16 SENSOR 17 SENSOR 18

INLET VALV E OUTLET VALV E INLET VALV E OUTLET VALV E INLET VALVE OUTLET VALV E ABVINLET VALV E OUTLET VALV E

RIGHT FRONT ABS VALVE

FRONT AXLE BRAKE (OPTIONAL)

GND

POWER

PRESSURE SENSOR

1 3 2

LEFT FRONT ABS VALVE

LEFT REAR ABS VALVE

RIGHT REAR ABS VALVE

RIGHT FRONT SENSOR

LEFT REAR SENSOR

LEFT FRONT SENSOR

RIGHT REAR SENSOR

GND

REAR

ABV

16 AWG

BACK VIEW OF HARNESS CONNECTOR

SAE

J1939

TR-WL

SAE

J1939

ATC

ABS ECU-

GND

BAT ECU+

JUMPER

SAE

J1587

SAE

J1587

ABS

LAMP

3RD BRK

ATC

LAMP

2 1

5 4

8 7

11 10

14 13

14 PIN CONNECTOR

TRAILER INDICATOR LAMP

J1939 L

J1939 H

15A AMP

5 AMP

14 AWG

BAT

IGN

J1587 B

J1587 A

ATC

SWITCH

J1587 B J1587 A J1939 L J1939 H BATTERY ECU+

RETARDER TRAILER

INDICATOR LAMP ATC LAMP TRACTOR

INDICATOR LAMP

ATC SWITCH ABS OFF

ROAD ECUGND

10 11

1 3 8 7

13 15

6 5

ATC/RSC LAMP

TRACTOR INDICATOR LAMP

BLINK CODE

SWITCH

ABS OFF ROAD SWITCH

14 AWG

87A

RETARDER

4004030k

Momentary Switch

Optional Equipment

Twisted Pair = TP All unmarked wires should be 16 or 18 AWG. All fuses should be blade type. *All connected to a common star ground.

3RD AXLE LEFT SENSOR

16 AWG

3RD AXLE RIGHT SENSOR

3RD AXLE LEFT ABS VALVE

3RD AXLE RIGHT ABS VALVE

GND

X2 X4

6S/6M Universal ECU with RSC and Optional Front Axle Brake (6S/4M and 4S/4M Configurations are also available)

Figure6.9

Figure 6.9

WABCO Maintenance Manual MM-0112 (Revised 07-18)

6 Wiring Diagrams and Connectors

6S/6M Universal ECU with Electronic Stability Control (ESC) (6S/4M and 4S/4M Configurations are also available)

Figure6.10

Figure 6.10

16 AWG

GND

RIGHT FRONT ABS VALVE

LEFT FRONT ABS VALVE

LEFT REAR ABS VALVE

RIGHT REAR ABS VALVE

RIGHT FRONT SENSOR

LEFT REAR SENSOR

LEFT FRONT SENSOR

RIGHT REAR SENSOR

INLET

VALV E

OUTLET

VALV E

OUTLET

VALV E

INLET

VALV E

OUTLET

VALV E

INLET

VALV E

INLET

2 1

VALV E

OUTLET

5 4

VALV E

8 7

ABV-

X2 X4

SENSOR

11 10

SENSOR

14 13

SENSOR

17 16

ABV+

INLET VALV E OUTLET VALV E INLET VALV E OUTLET VALV E INLET VALVE OUTLET VALV E ABVINLET VALV E OUTLET VALV E

18 PIN CONNECTOR

SENSOR 10 SENSOR 13 SENSOR 11 SENSOR 14 SENSOR 12 SENSOR 15 ABV+ 16 SENSOR 17 SENSOR 18

7 8

SAS

MODULE

(SAS)

ESC

MODULE

DRIVER’S

BRAKE

DEMAND

REAR

ABV

FRONT AXLE ABV

GND

CAN

GND

PRESSURE SENSOR

GND

BACK VIEW OF HARNESS CONNECTOR

INLET

VALV E

OUTLET

VALV E

NOT

USED

INLET

VALV E

OUTLET

VALV E

SENSOR AUX 1

SENSOR

TRL

ABV-

SENSOR

2 1

AUX 2

5 4

AUX 3

8 7

AUX 4

11 10

TRL

14 13

ABV+

TRL ABV- 8

TRL ABV+ 13

NOT USED 9

SENSOR 2

SENSOR 5

15 PIN CONNECTOR

INLET 3

OUTLET 6

SENSOR 11

SENSOR 14

INLET 12

OUTLET 15

16 AWG

GND

TRAILER ABV

3RD AXLE LEFT SENSOR

3RD AXLE LEFT ABS VALVE

3RD AXLE RIGHT SENSOR

3RD AXLE RIGHT ABS VALVE

BACK VIEW OF HARNESS CONNECTOR

SAE

J1939

GND

JUMPER

ABS

LAMP

TR-WL

ATC

J1587

ABS ECU-

BAT ECU+

SAE

3RD BRK

BACK VIEW OF HARNESS CONNECTOR

SAE

2 1

J1939

5 4

8 7

SAE

11 10

J1587

ATC

14 13

LAMP

J1587 B J1587 A J1939 L J1939 H BATTERY ECU+

RETARDER TRAILER

INDICATOR LAMP

14 PIN CONNECTOR

ATC LAMP TRACTOR

INDICATOR LAMP

ATC SWITCH ABS OFF

ROAD ECUGND

10 11

1 3

14 AWG

TRAILER INDICATOR LAMP

ATC/RSC LAMP

TRACTOR INDICATOR LAMP

BLINK CODE

ABS OFF ROAD SWITCH

SWITCH

15A AMP

10 AMP

87A

RETARDER

ATC

SWITCH

GND*

J1587 B

J1587 A

J1939 L

J1939 H

BAT

IGN

Momentary Switch

Optional Equipment

Twisted Pair = TP All unmarked wires should be 16 or 18 AWG. All fuses should be blade type. *All connected to a common star ground.

4007397b

WABCO Maintenance Manual MM-0112 (Revised 07-18)

6 Wiring Diagrams and Connectors

6S/6M Universal ECU with ESC and Hill Start Aid (HSA) (6S/4M and 4S/4M Configurations are also available)

Figure6.11

Figure 6.11

16 AWG

GND

RIGHT FRONT ABS VALVE

LEFT FRONT ABS VALVE

LEFT REAR ABS VALVE

RIGHT REAR ABS VALVE

RIGHT FRONT SENSOR

LEFT REAR SENSOR

LEFT FRONT SENSOR

RIGHT REAR SENSOR

INLET VALV E

OUTLET

VALV E

OUTLET

VALV E

INLET

VALV E

OUTLET

VALV E

INLET

VALV E

INLET

2 1

VALV E

OUTLET

5 4

VALV E

8 7

ABV-

X2 X4

SENSOR

11 10

SENSOR

14 13

17 16

SENSOR ABV+

SENSOR

INLET VALV E OUTLET VALV E INLET VALV E OUTLET VALV E INLET VALVE OUTLET VALV E ABVINLET VALV E OUTLET VALV E

18 PIN CONNECTOR

SENSOR 10 SENSOR 13 SENSOR 11 SENSOR 14 SENSOR 12 SENSOR 15 ABV+ 16 SENSOR 17 SENSOR 18

7 8

SAS

MODULE

(SAS)

ESC

MODULE

DRIVER’S

BRAKE

DEMAND

REAR

ABV

FRONT AXLE ABV

GND

CAN

PRESSURE SENSOR

GND

BACK VIEW OF HARNESS CONNECTOR

INLET

VALV E

OUTLET

VALV E

NOT

USED

INLET

VALV E

OUTLET

VALV E

SENSOR

TRL

ABV-

SENSOR

HSA

2 1

LAMP

HSA

5 4

SWITCH

AUX 3

8 7

AUX 4

11 10

TRL

14 13

ABV+

HSA SWITCH 4

HSA LAMP 1

TRL ABV- 8

TRL ABV+ 13

NOT USED 9

SENSOR 2

SENSOR 5

15 PIN CONNECTOR

INLET 3

OUTLET 6

SENSOR 11

SENSOR 14

INLET 12

OUTLET 15

GND

16 AWG

GND

RSC VALVE

3RD AXLE LEFT SENSOR

3RD AXLE LEFT ABS VALVE

3RD AXLE RIGHT SENSOR

3RD AXLE RIGHT ABS VALVE

BACK VIEW OF HARNESS CONNECTOR

SAE

TR-WL

J1939

ATC

GND

JUMPER

ABS

LAMP

ABS ECU-

BAT ECU+

SAE

J1587

3RD BRK

BACK VIEW OF HARNESS CONNECTOR

SAE

2 1

J1939

5 4

8 7

SAE

11 10

J1587

ATC

14 13

LAMP

J1587 B J1587 A J1939 L J1939 H BATTERY ECU+

RETARDER TRAILER

INDICATOR LAMP

14 PIN CONNECTOR

ATC LAMP TRACTOR

INDICATOR LAMP

ATC SWITCH ABS OFF

ROAD ECUGND

10 11

1 3

14 AWG

TRAILER INDICATOR LAMP

ATC/RSC LAMP

TRACTOR INDICATOR LAMP

BLINK CODE

SWITCH

ABS OFF ROAD SWITCH

15A AMP

5 AMP

87A

RETARDER

SWITCH

GND*

ATC

J1587 B

J1587 A

J1939 L

J1939 H

BAT

IGN

Momentary Switch

Optional Equipment

Twisted Pair = TP All unmarked wires should be 16 or 18 AWG. All fuses should be blade type. *All connected to a common star ground.

4008457b

WABCO Maintenance Manual MM-0112 (Revised 07-18)

6 Wiring Diagrams and Connectors

BACK VIEW OF HARNESS CONNECTOR

2 1

5 4

8 7

11 10

14 13

15 PIN CONNECTOR

RSC VALVE

GND*

BACK VIEW OF HARNESS CONNECTOR

INLET

VALV E

INLET VALV E

INLET

VALV E

OUTLET

VALV E

OUTLET

VALV E

OUTLET

VALV E

OUTLET

VALV E

INLET

VALV E

ABV-

SENSOR

2 1

5 4

8 7

11 10

14 13

SENSOR

SENSOR ABV+

17 16

18 PIN CONNECTOR

SENSOR 10 SENSOR 13 SENSOR 11 SENSOR 14 SENSOR 12 SENSOR 15 ABV+ 16 SENSOR 17 SENSOR 18

INLET VALV E OUTLET VALV E INLET VALV E OUTLET VALV E INLET VALVE OUTLET VALV E ABVINLET VALV E OUTLET VALV E

RIGHT FRONT ABS VALVE

LEFT FRONT ABS VALVE

LEFT REAR ABS VALVE

RIGHT REAR ABS VALVE

RIGHT FRONT SENSOR

LEFT REAR SENSOR

LEFT FRONT SENSOR

RIGHT REAR SENSOR

GND

REAR

ABV

16 AWG

BACK VIEW OF HARNESS CONNECTOR

SAE

J1939

TR-WL

SAE

J1939

ATC

ABS ECU-

GND

BAT ECU+

JUMPER

SAE

J1587

SAE

J1587

ABS

LAMP

3RD BRK

ATC

LAMP

2 1

5 4

8 7

11 10

14 13

14 PIN CONNECTOR

TRAILER INDICATOR LAMP

J1939 L

J1939 H

15A AMP

5 AMP

14 AWG

BAT

IGN

J1587 B

J1587 A

ATC

SWITCH

J1587 B J1587 A J1939 L J1939 H BATTERY ECU+

RETARDER TRAILER

INDICATOR LAMP ATC LAMP TRACTOR

INDICATOR LAMP

ATC SWITCH ABS OFF

ROAD ECUGND

10 11

1 3 8 7

13 15

6 5

ATC/RSC LAMP

TRACTOR INDICATOR LAMP

BLINK CODE

SWITCH

ABS OFF ROAD SWITCH

14 AWG

87A

RETARDER

4012621a

Momentary Switch

Optional Equipment

Twisted Pair = TP All unmarked wires should be 16 or 18 AWG. All fuses should be blade type. *All connected to a common star ground.

3RD AXLE LEFT SENSOR

16 AWG

3RD AXLE RIGHT SENSOR

3RD AXLE LEFT ABS VALVE

3RD AXLE RIGHT ABS VALVE

GND

X2 X4

GND

FRONT AXLE ABV

GND

CAN

SAS

MODULE

(SAS)

DRIVER DEMAND

PRESSURE

(OPTIONAL)

AIR 1

COMPRESSOR

UPLOADER

DRYER REGEN

GND

ECU IGN +

1 3 2

ESC

MODULE

HSA LAMP 1

TRL ABV- 8

TRL ABV+ 13

NOT USED 9

SENSOR 2

SENSOR 5

INLET 3

OUTLET 6

SENSOR 11

SENSOR 14

INLET 12

OUTLET 15

INLET

VALV E

INLET

VALV E

OUTLET

VALV E

OUTLET

VALV E

NOT

USED

TRL

ABV-

TRL

ABV+

SENSOR

HSA

LAMP

HSA

SWITCH

AUX 3

AUX 4

SENSOR

HSA SWITCH 4

6S/6M E8 Universal ECU with Electronic Stability Control (ESC), Hill Start Aid (HSA) and Electronic Air Processing (EAP) Function (6S/4M and 4S/4M Configurations are also available)

Figure6.12

Figure 6.12

WABCO Maintenance Manual MM-0112 (Revised 07-18)

6 Wiring Diagrams and Connectors

6S/6M Frame-mounted ECU ABS or RSC (6S/4M and 4S/4M Configurations are also available)

Figure6.13

6 7

5 8

4 9

3 10

2 11

1 12

16 AWG

ABS OFF ROAD SWITCH

GND

X4-BROWN

(FOR 6 CHANNEL ONLY)

6 7

5 8

4 9

3 10

2 11

1 12

REAR AXLE

ABV

16 AWG

RIGHT REAR

X3-GREEN

SENSOR

R3RD

SENSOR

L3RD

SENSOR

LEFT REAR

(6S/4M AND 6S/6M ONLY)

OUTLET

COMMON

INLET

(6S/4M AND 6S/6M ONLY)

OUTLET

COMMON

INLET

OUTLET

COMMON

INLET

OUTLET

COMMON

INLET

ABS VALVE RIGHT 3RD

(6S/6M ONLY)

ABS VALVE

LEFT 3RD

(6S/6M ONLY)

ABS VALVE RIGHT REAR

ABS VALVE

LEFT REAR

+12V IGN

OR BATTERY

12V IGN

86 85

30 87A

TO RETARDER

ABS VALVE LEFT FRONT

ABS VALVE

RIGHT FRONT

15AMP

5 OR

10 AMP*

ABS LAMP

BLINK CODE

87A

TRAILER WL

INLET

COMMON

OUTLET

COMMON

INLET

GND

LAMP

ATC/RSC LAMP

14 AWG 14 AWG

14 AWG

+12V +12V

GND

BLINK CODE

SWITCH

GND

ATC SWITCH

(OPTIONAL)

RETARDER

TRAILER

ABV

16 AWG

SENSOR

LEFT FRONT

SENSOR

RIGHT FRONT

J1587 -B

J1587 +A

J1939 - H

J1939 - L

*4 VALVES – 5 AMP *6 VALVES – 10 AMP

12 1

11 2

10 3

9 4

8 5

7 6

X1-GRAY

12 1

11 2

10 3

9 4

8 5

7 6

X2-BLACK

4004031d

Figure 6.13

WABCO Maintenance Manual MM-0112 (Revised 07-18)

6 Wiring Diagrams and Connectors

6S/6M Frame-mounted ECU with ESC (6S/4M and 4S/4M Configurations are also available)

Figure6.14

6 7

5 8

4 9

3 10

2 11

1 12

16 AWG

X4-BROWN

(FOR 6 CHANNEL ONLY)

SENSOR

R3RD

SENSOR

LEFT 3RD

(6S/4M AND 6S/6M ONLY)

OUTLET

COMMON

INLET

(6S/4M AND 6S/6M ONLY)

OUTLET

COMMON

INLET

BATTERY

ABS VALVE

RIGHT 3RD

(6S/6M ONLY)

ABS VALVE

LEFT 3RD

(6S/6M ONLY)

+12V

IGN

30 87A

TO RETARDER

87A

15AMP

BLINK CODE

SWITCH

ABS

LAMP

ATC/RSC/ESC

TRAILER WL

LAMP

14 AWG 14 AWG

14 AWG

GND

ATC SWITCH

(OPTIONAL)

DRIVER’S

BRAKE

DEMAND

AUX 1

TRAILER

ABV

J1587+A

J1587-B

GND

PRESSURE

SENSOR SIGNAL

RETARDER

ABS OFF-ROAD

SWITCH (OPTIONAL)

J1939-H

J1939-L

+12V +12V

GND

LD-GND

X1-BLACK

6 7

5 8

4 9

3 10

2 11

1 12

X3-GREEN

Figure 6.14

REAR AXLE

ABV

16 AWG

SENSOR

RIGHT REAR

SENSOR

LEFT REAR

OUTLET

COMMON

INLET

OUTLET

COMMON

INLET

ABS VALVE

RIGHT REAR

ABS VALVE

LEFT REAR

GND

STEERING

ANGLE

SENSOR

(SAS)

ESC

MODULE

FRONT AXLE

ABS VALVE LEFT FRONT

ABS VALVE

RIGHT FRONT

ABV

INLET

COMMON

OUTLET

COMMON

INLET

LD-GND

RIGHT FRONT

SENSOR

LEFT FRONT

SENSOR

CAN-L

CAN-H

16 AWG

X2-GREEN

4010642a

WABCO Maintenance Manual MM-0112 (Revised 07-18)

6 Wiring Diagrams and Connectors

X3-GREEN

SENSOR

RIGHT REAR

SENSOR

LEFT REAR

6 7

5 8

4 9

3 10

2 11

1 12

OUTLET

COMMON

INLET

OUTLET

COMMON

INLET

ABS VALVE RIGHT REAR

ABS VALVE

LEFT REAR

X4-BROWN

6 7

5 8

4 9

3 10

2 11

1 12

*DIFFERENTIAL

LOCK

11 2

10 3

9 4

8 5

7 6

ABS VALVE

RIGHT FRONT

ABS VALVE

LEFT FRONT

INLET

COMMON

OUTLET

COMMON

INLET

SENSOR

LEFT FRONT

SENSOR

RIGHT FRONT

X2-BLACK

12 1

GND

12V IGN

15AMP

5AMP

GND

+12V +12V

GND

12 1

11 2

10 3

9 4

8 5

7 6

TRAILER WL

RETARDER

J1587 -B

J1587 +A

TO RETARDER

87A

ATC/RSC LAMP

BLINK CODE

SWITCH

ATC SWITCH

(OPTIONAL)

ABS LAMP

BLINK CODE

86 85

30 87A

X1-GRAY

LAMP

14 AWG 14 AWG

14 AWG

J1939 - H

J1939 - L

DCDL

DCTC

TRANSFER CASE

LOCK

*Differential Lock Solenoid is optional in some vehicles. If you are replacing the ECU with a Service Kit, please follow carefully instructions provided on it.

16 AWG

4012053a

+12V IGN

OR BATTERY

4S/4M Frame-mounted ECU with Supervised-Lock-Control (SLC) Feature

Figure6.15

Figure 6.15

WABCO Maintenance Manual MM-0112 (Revised 07-18)

6 Wiring Diagrams and Connectors

6S/6M Frame-mounted ECU with ESC and Hill Start Aid (HSA) (6S/4M and 4S/4M with HSA and without ESC Configurations are also available)

Figure6.16

6 7

5 8

4 9

3 10

2 11

1 12

16 AWG

HSA

SWITCH

X4-BROWN

(FOR 6 CHANNEL ONLY)

SENSOR

R3RD

SENSOR

LEFT 3RD

(6S/4M AND 6S/6M ONLY)

OUTLET

COMMON

INLET

(6S/4M AND 6S/6M ONLY)

OUTLET

COMMON

INLET

BATTERY

ABS VALVE

RIGHT 3RD

(6S/6M ONLY)

ABS VALVE

LEFT 3RD

(6S/6M ONLY)

+12V

IGN

30 87A

TO RETARDER

87A

15AMP

BLINK CODE

SWITCH

ABS

LAMP

ATC/RSC/ESC

TRAILER WL

LAMP

14 AWG 14 AWG

14 AWG

GND

ATC SWITCH

(OPTIONAL)

DRIVER’S

BRAKE

DEMAND

HSA

LAMP

TRAILER

ABV

J1587+A

J1587-B

GND

PRESSURE

SENSOR SIGNAL

RETARDER

ABS OFF-ROAD

SWITCH (OPTIONAL)

J1939-H

J1939-L

+12V +12V

GND

LD-GND

X1-BLACK

6 7

5 8

4 9

3 10

2 11

1 12

X3-GREEN

Figure 6.16

REAR AXLE

ABV

16 AWG

SENSOR

RIGHT REAR

SENSOR

LEFT REAR

OUTLET

COMMON

INLET

OUTLET

COMMON

INLET

ABS VALVE

RIGHT REAR

ABS VALVE

LEFT REAR

GND

STEERING

ANGLE

SENSOR

(SAS)

ESC

MODULE

FRONT AXLE

ABS VALVE LEFT FRONT

ABS VALVE

RIGHT FRONT

ABV

INLET

COMMON

OUTLET

COMMON

INLET

LD-GND

RIGHT FRONT

SENSOR

LEFT FRONT

SENSOR

CAN-L

CAN-H

16 AWG

X2-GREEN

4010643a

WABCO Maintenance Manual MM-0112 (Revised 07-18)

7 SPN, SID, FMI Fault Codes

SPN, SID, FMI Diagnostic Trouble Code List

Figure7.1

7 SPN, SID, FMI Fault Codes

• Check communication device connections.

Cause Action

Left Front Wheel Speed Sensor

System

Reaction

Light

Warning

Description

Blink

Code

to date.

• Verify protocol (J1708/J1939) was not changed on the same key cycle.

• Verify RP1012A compliant device, and verify the device software and ﬁrmware are up

• Check data link connector for issues.

• Adjust wheel sensor to touch tone ring.

• Check condition of ABS sensor head.

ABS ECU not fully

communicating with

TOOL BOX

0 1 TOOLBOX ABS WL

• Check for loose wheel bearings or excessive hub runout.

Sensor air gap is too

large; sensor output

Disabled

ABS Wheel

voltag e.

• Check mounting of ABS tone ring and condition of teeth.

• Check condition and retention of ABS sensor spring clip.

• Check ABS sensor cable routing and clipping.

• Turn the wheel at half a revolution per second and verify 0.2 AC volt sensor output

voltage is too low

but is high enough

to be read by ECU.

HSA Disabled

ESC/RSC/ATC/

• Check for tire size mismatch.

• Check for correct number of tone ring teeth.

System has

detected a

signiﬁcant difference

in the proportion

Disabled

ABS Wheel

• Verify that ECU is programmed for the correct vehicle.

of tire diameter to

number of tone ring

teeth between wheel

ends. 10% (+/-2%)

Continuity between

ABS Wheel

HSA Disabled

ESC/RSC/ATC/

sensor.

• Verify 900-2000 ohms resistance through sensor circuit.

• Verify no DC voltage through sensor circuit Key ON.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

the sensor

connection and

battery voltage

(short circuit) is

detected.

Disabled

HSA Disabled

ESC/RSC/ATC/

ABS WL

UBATT

Shorted to

sensor.

• Verify 900-2000 ohms resistance through sensor circuit.

• Check for continuity between the ABS sensor connection and ground.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

• Verify wheel speed sensor wires are not switched left/right.

• Check sensor, sensor cable and connectors to verify no loose or damaged connection.

• Verify 900-2000 ohms resistance through sensor circuit.

• Verify wheel speed sensor wires are not switched left/right.

Continuity between

the sensor

connection and

ground (short circuit)

is detected.

An open circuit has

been detected,

i.e. ECU detects a

disconnected wheel

speed sensor.

Continuity

Disabled

ABS Wheel

ABS WL

Ground

Shorted to

ESC/RSC/ATC/

HSA Disabled

Disabled

ABS Wheel

ESC/RSC/ATC/

HSA Disabled

ABS Wheel

sensor.

• Verify 900-2000 ohms resistance through sensor circuit.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

interruption

between the sensor

connections (short

circuit) has been

detected.

Disabled

HSA Disabled

ESC/RSC/ATC/

SPN SID FMI

Figure 7.1

789 1 1 3 + 2 Air Gap ABS WL

789 1 2 5 + 2 Incorrect Tire ABS WL

789 1 3 4 + 2

789 1 4 4 + 2

789 1 5 4 + 2 Open Circuit ABS WL

WABCO Maintenance Manual MM-0112 (Revised 07-18)

789 1 6 4 + 2 Short Circuit ABS WL

4010644a

7 SPN, SID, FMI Fault Codes

SPN SID FMI

Blink

Code

Description

Warning

Light

System

Reaction

Cause Action

789 1 7 6 + 2

Incorrect Tone

Ring

ABS WL

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

Wheel speed

signal drops out

periodically at

speeds higher than

6 mph.

• Check for damaged or missing teeth on tone ring.

• Verify tone ring is not corroded or with contamination.

789 1 8 3 + 2 Excessive Slip ABS WL

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

Wheel slip over

16 seconds

continuously has

been detected.

• Adjust wheel sensor to touch tooth wheel.

• Check sensor gap.

• Check for loose wheel bearings or excessive hub runout.

789 1 9 5 + 2

Wires

Mismatched

ABS WL

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

A sensor lead from

an incorrect wheel

end has been

detected.

• Check for mismatch fault of another sensor.

• Verify correct harness location and wiring for sensor.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

sensor.

789 1 10 3 + 2

Speed Drop-

Out

ABS WL

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

A temporary loss

of the ABS wheel

speed signal has

been detected.

• Adjust wheel speed sensor until it touches the tone ring.

• Check for loose wheel bearings or excessive hub runout.

• Check sensor wiring and connectors for intermittent contact.

• Check condition of ABS sensor head.

• Check mounting of tone ring and condition of teeth.

• Check condition and retention of ABS sensor or spring clip.

• Check ABS sensor cable routing and clipping.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

sensor.

• Turn the wheel at half a revolution per second and verify 0.2 AC volt sensor output

voltag e.

789 1 11 5 + 2

Abnormal

Speed

(Chatter)

ABS WL

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

Brake drag or

chatter has been

detected. Abnormal

vibrations detected

which affect sensor

signal.

• Check for loose wheel bearings or excessive hub runout.

• Check sensor wiring and connectors for intermittent contact.

• Check mounting of tone ring and condition of teeth.

• Check condition and retention of ABS sensor spring clip as well as the mounting block.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

sensor.

• Turn the wheel at half a revolution per second and verify 0.2 AC volt sensor output

voltag e.

789 1 12 5 + 2

Frequency

Too High

ABS WL

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

A non-plausible

sensor frequency

has been measured.

• Check sensor wiring and connectors for intermittent contact.

• Check if brake at this location is operating correctly, i.e., potentially dragging.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

sensor.

789 1 13 N/A

Brake

Performance

issue LF,RR,

L3rd

ATC WL N/A

Brake performance

monitor condition

exceeded.

• Check the foundation brakes for all wheel ends.

4010645a

Figure7.2

Figure 7.2

WABCO Maintenance Manual MM-0112 (Revised 07-18)

7 SPN, SID, FMI Fault Codes

Figure7.3

• Adjust wheel sensor to touch tone ring.

Cause Action

Right Front Wheel Speed Sensor

System

Reaction

Light

Warning

Description

Blink

Code

• Check condition of ABS sensor head.

• Check for loose wheel bearings or excessive hub runout.

• Check mounting of ABS tone ring and condition of teeth.

Sensor air gap is too

large, sensor output

Disabled

ABS Wheel

voltag e.

• Check condition and retention of ABS sensor spring clip.

• Check ABS sensor cable routing and clipping.

• Turn the wheel at half a revolution per second and verify 0.2 AC volt sensor output

voltage is too low

but is high enough to

be read by ECU.

System has

HSA Disabled

ESC/RSC/ATC/

• Check for tire size mismatch.

• Check for correct number of tone ring teeth.

detected a

signiﬁcant difference

in the proportion of

Disabled

ABS Wheel

• Verify that ECU is programmed for the correct vehicle.

• Contact WABCO or OEM.

tire diameter to

number of tone ring

teeth between wheel

ends. 10% (+/-2%)

HSA Disabled

ESC/RSC/ATC/

sensor.

• Verify 900-2000 ohms resistance through sensor circuit.

• Verify no DC voltage through sensor circuit Key ON.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

Continuity between

the sensor

connection and

battery voltage

(short circuit) is

detected.

Disabled

ABS Wheel

ESC/RSC/ATC/

ABS WL

UBATT

Shorted to

HSA Disabled

sensor.

• Verify 900-2000 ohms resistance through sensor circuit.

• Check for continuity between the ABS sensor connection and ground.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

• Verify wheel speed sensor wires are not switched left/right.

• Check sensor, sensor cable and connectors to verify no loose or damaged connection.

• Verify 900-2000 ohms resistance through sensor circuit.

• Verify wheel speed sensor wires are not switched left/right.

Continuity between

the sensor

connection and

ground (short circuit)

is detected.

An open circuit has

been detected, i.e.

ECU detects a

disconnected wheel

speed sensor.

Disabled

ABS Wheel

ESC/RSC/ATC/

ABS WL

Ground

Shorted to

HSA Disabled

Disabled

ABS Wheel

ESC/RSC/ATC/

HSA Disabled

sensor.

• Verify 900-2000 ohms resistance through sensor circuit.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

Continuity

interruption between

the sensor

connections (short

circuit) has been

detected.

Disabled

ABS Wheel

ESC/RSC/ATC/

HSA Disabled

SPN SID FMI

Figure 7.3

790 2 1 3 + 1 Air Gap ABS WL

790 2 2 5 + 1 Incorrect Tire ABS WL

790 2 3 4 + 1

790 2 4 4 + 1

790 2 5 4 + 2 Open Circuit ABS WL

790 2 6 4 + 1 Short Circuit ABS WL

4010646a

WABCO Maintenance Manual MM-0112 (Revised 07-18)

7 SPN, SID, FMI Fault Codes

Figure7.4

Cause Action

Wheel speed signal

System

Reaction

ABS Wheel

Light

Warning

Description

Blink

Code

• Check for damaged or missing teeth on tone ring.

• Verify tone ring is not corroded or with contamination.

drops out

periodically at

speeds higher than

Disabled

ESC/RSC/ATC/

ABS WL

Ring

Incorrect Tone

• Adjust wheel sensor to touch tooth wheel.

• Check sensor gap.

• Check for loose wheel bearings or excessive hub runout.

• Check for mismatch fault of another sensor.

• Verify correct harness location and wiring for sensor.

6 mph.

Wheel slip over 16

seconds

continuously has

been detected.

A sensor lead from

an incorrect wheel

HSA Disabled

Disabled

ABS Wheel

ESC/RSC/ATC/

HSA Disabled

Disabled

ABS Wheel

ABS WL

Wires

sensor.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

• Adjust wheel speed sensor until it touches the tone ring.

• Check for loose wheel bearings or excessive hub runout.

• Check sensor wiring and connectors for intermittent contact.

• Check condition of ABS sensor head.

• Check mounting of tone ring and condition of teeth.

end has been

detected.

HSA Disabled

ESC/RSC/ATC/

Mismatched

A temporary loss of

Disabled

ABS Wheel

sensor.

• Check condition and retention of ABS sensor spring clip.

• Check ABS sensor cable routing and clipping.

the ABS wheel

speed signal has

ESC/RSC/ATC/

ABS WL

Speed

Drop-Out

voltag e.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

• Turn the wheel at half a revolution per second and verify 0.2 AC volt sensor output

been detected.

HSA Disabled

• Check for loose wheel bearings or excessive hub runout.

sensor.

• Check sensor wiring and connectors for intermittent contact.

• Check mounting of tone ring and condition of teeth.

• Check condition and retention of ABS sensor spring clip as well as the mounting block.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

• Turn the wheel at half a revolution per second and verify 0.2 AC volt sensor output

Brake drag or

chatter has been

detected. Abnormal

vibrations detected

which affect sensor

signal.

Disabled

ABS Wheel

ABS WL

Speed

Abnormal

HSA Disabled

ESC/RSC/ATC/

(Chatter)

voltag e.

ABS Wheel

sensor.

• Check sensor wiring and connectors for intermittent contact.

• Check if brake at this location is operating correctly, i.e., potentially dragging.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

A non-plausible

sensor frequency

has been measured.

Disabled

HSA Disabled

ESC/RSC/ATC/

ABS WL

Too High

Frequency

SPN SID FMI

790 2 7 6 + 1

790 2 8 3 + 1 Excessive Slip ABS WL

Figure 7.4

WABCO Maintenance Manual MM-0112 (Revised 07-18)

790 2 9 5 + 1

790 2 10 3 + 1

790 2 11 5 + 1

790 2 12 5 + 1

4010647a

7 SPN, SID, FMI Fault Codes

Figure7.5

• Adjust wheel sensor to touch tone ring.

Cause Action

Left Rear Wheel Speed Sensor

System

Reaction

Light

Warning

Description

Blink

Code

• Check condition of ABS sensor head.

• Check for loose wheel bearings or excessive hub runout.

• Check mounting of ABS tone ring and condition of teeth.

Sensor air gap is too

large, sensor output

Disabled

ABS Wheel

voltag e.

• Check condition and retention of ABS sensor spring clip.

• Check ABS sensor cable routing and clipping.

• Turn the wheel at half a revolution per second and verify 0.2 AC volt sensor output

voltage is too low

but is high enough to

be read by ECU.

System has

HSA Disabled

ESC/RSC/ATC/

• Check for tire size mismatch.

detected a

signiﬁcant difference

in the proportion of

Disabled

ABS Wheel

• Check for correct number of tone ring teeth.

• Verify that ECU is programmed for the correct vehicle.

tire diameter to

number of tone ring

teeth between wheel

ends. 10% (+/-2%)

HSA Disabled

ESC/RSC/ATC/

sensor.

• Verify 900-2000 ohms resistance through sensor circuit.

• Verify no DC voltage through sensor circuit Key ON.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

Continuity between

the sensor

connection and

battery voltage

(short circuit) is

detected.

Disabled

ABS Wheel

ESC/RSC/ATC/

ABS WL

UBATT

Shorted to

HSA Disabled

sensor.

• Verify 900-2000 ohms resistance through sensor circuit.

• Check for continuity between the ABS sensor connection and ground.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

• Verify wheel speed sensor wires are not switched left/right.

• Check sensor, sensor cable and connectors to verify no loose or damaged connection.

• Verify 900-2000 ohms resistance through sensor circuit.

• Verify wheel speed sensor wires are not switched left/right.

Continuity between

the sensor

connection and

ground (short circuit)

is detected.

An open circuit has

been detected, i.e.

ECU detects a

disconnected wheel

speed sensor.

Disabled

ABS Wheel

ESC/RSC/ATC/

ABS WL

Ground

Shorted to

HSA Disabled

Disabled

ABS Wheel

ESC/RSC/ATC/

HSA Disabled

sensor.

• Verify 900-2000 ohms resistance through sensor circuit.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

Continuity

interruption between

the sensor

connections (short

circuit) has been

detected.

Disabled

ABS Wheel

ESC/RSC/ATC/

HSA Disabled

SPN SID FMI

Figure 7.5

791 3 1 3 + 4 Air Gap ABS WL

791 3 2 5 + 4 Incorrect Tire ABS WL

791 3 3 4 + 4

791 3 4 4 + 4

791 3 5 4 + 4 Open Circuit ABS WL

791 3 6 4 + 4 Short Circuit ABS WL

4010648a

WABCO Maintenance Manual MM-0112 (Revised 07-18)

7 SPN, SID, FMI Fault Codes

SPN SID FMI

Blink

Code

Description

Warning

Light

System

Reaction

Cause Action

791 3 7 6 + 4

Incorrect Tone

Ring

ABS WL

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

Wheel speed signal

drops out

periodically at

speeds higher than

6 mph.

• Check for damaged or missing teeth on tone ring.

• Verify tone ring is not corroded or with contamination.

791 3 8 3 + 4 Excessive Slip ABS WL

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

Wheel slip over 16

seconds

continuously has

been detected.

• Adjust wheel sensor to touch tooth wheel.

• Check sensor gap.

• Check for loose wheel bearings or excessive hub runout.

791 3 9 5 + 4

Wires

Mismatched

ABS WL

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

A sensor lead from

an incorrect wheel

end has been

detected.

• Check for mismatch fault of another sensor.

• Verify correct harness location and wiring for sensor.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

sensor.

791 3 10 3 + 4

Speed

Drop-Out

ABS WL

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

A temporary loss of

the ABS wheel

speed signal has

been detected.

• Adjust wheel speed sensor until it touches the tone ring.

• Check for loose wheel bearings or excessive hub runout.

• Check sensor wiring and connectors for intermittent contact.

• Check condition of ABS sensor head.

• Check mounting of tone ring and condition of teeth.

• Check condition and retention of ABS sensor spring clip.

• Check ABS sensor cable routing and clipping.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

sensor.

• Turn the wheel at half a revolution per second and verify 0.2 AC volt sensor output

voltag e.

791 3 11 5 + 4

Abnormal

Speed

(Chatter)

ABS WL

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

Brake drag or

chatter has been

detected. Abnormal

vibrations detected

which affect sensor

signal.

• Check for loose wheel bearings or excessive hub runout.

• Check sensor wiring and connectors for intermittent contact.

• Check mounting of tone ring and condition of teeth.

• Check condition and retention of ABS sensor spring clip as well as the mounting block.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

sensor.

• Turn the wheel at half a revolution per second and verify 0.2 AC volt sensor output

voltag e.

791 3 12 5 + 4

Frequency

Too High

ABS WL

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

A non-plausible

sensor frequency

has been measured.

• Check sensor wiring and connectors for intermittent contact.

• Check if brake at this location is operating correctly, i.e., potentially dragging.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

sensor.

789 3 13 N/A

Brake

Performance

issue RF,LR,

R3rd

ATC WL N/A

Brake performance

monitor condition

exceeded.

• Check the foundation brakes for all wheel ends.

4010649a

Figure7.6

Figure 7.6

WABCO Maintenance Manual MM-0112 (Revised 07-18)

7 SPN, SID, FMI Fault Codes

Figure7.7

• Adjust wheel sensor to touch tone ring.

Cause Action

Right Rear Wheel Speed Sensor

System

Reaction

Light

Warning

Description

Blink

Code

• Check condition of ABS sensor head.

• Check for loose wheel bearings or excessive hub runout.

• Check mounting of ABS tone ring and condition of teeth.

Sensor air gap is too

large, sensor output

Disabled

ABS Wheel

voltage.

• Check condition and retention of ABS sensor spring clip.

• Check ABS sensor cable routing and clipping.

• Turn the wheel at half a revolution per second and verify 0.2 AC volt sensor output

voltage is too low

but is high enough to

be read by ECU.

System has

HSA Disabled

ESC/RSC/ATC/

• Check for tire size mismatch.

• Check for correct number of tone ring teeth.

detected a

signiﬁcant difference

in the proportion of

Disabled

ABS Wheel

• Verify that ECU is programmed for the correct vehicle.

• Contact WABCO or OEM.

tire diameter to

number of tone ring

teeth between wheel

ends. 10% (+/-2%)

HSA Disabled

ESC/RSC/ATC/

sensor.

• Verify 900-2000 ohms resistance through sensor circuit.

• Verify no DC voltage through sensor circuit Key ON.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

Continuity between

the sensor

connection and

battery voltage

(short circuit) is

detected.

Disabled

ABS Wheel

ESC/RSC/ATC/

ABS WL

UBATT

Shorted to

HSA Disabled

sensor.

• Verify 900-2000 ohms resistance through sensor circuit.

• Check for continuity between the ABS sensor connection and ground.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

• Verify wheel speed sensor wires are not switched left/right.

• Check sensor, sensor cable and connectors to verify no loose or damaged connection.

• Verify 900-2000 ohms resistance through sensor circuit.

• Verify wheel speed sensor wires are not switched left/right.

Continuity between

the sensor

connection and

ground (short circuit)

is detected.

An open circuit has

been detected, i.e.

ECU detects a

disconnected wheel

speed sensor.

Disabled

ABS Wheel

ESC/RSC/ATC/

ABS WL

Ground

Shorted to

HSA Disabled

Disabled

ABS Wheel

ESC/RSC/ATC/

HSA Disabled

sensor.

• Verify 900-2000 ohms resistance through sensor circuit.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

Continuity

interruption between

the sensor

connections (short

circuit) has been

detected.

Disabled

ABS Wheel

ESC/RSC/ATC/

HSA Disabled

SPN SID FMI

Figure 7.7

792 4 1 3 + 3 Air Gap ABS WL

792 4 2 5 + 3 Incorrect Tire ABS WL

792 4 3 4 + 3

792 4 4 4 + 3

792 4 5 4 + 3 Open Circuit ABS WL

792 4 6 4 + 3 Short Circuit ABS WL

4010650a

WABCO Maintenance Manual MM-0112 (Revised 07-18)

7 SPN, SID, FMI Fault Codes

Figure7.8

Cause Action

Wheel speed signal

System

Reaction

ABS Wheel

Light

Warning

Description

Blink

Code

• Check for damaged or missing teeth on tone ring.

• Verify tone ring is not corroded or with contamination.

drops out

periodically at

speeds higher than

Disabled

ESC/RSC/ATC/

ABS WL

Ring

Incorrect Tone

• Adjust wheel sensor to touch tooth wheel.

• Check sensor gap.

• Check for loose wheel bearings or excessive hub runout.

• Check for mismatch fault of another sensor.

• Verify correct harness location and wiring for sensor.

6 mph.

Wheel slip over 16

seconds

continuously has

been detected.

A sensor lead from

an incorrect wheel

HSA Disabled

Disabled

ABS Wheel

ESC/RSC/ATC/

HSA Disabled

Disabled

ABS Wheel

ABS WL

Wires

sensor.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

• Adjust wheel speed sensor until it touches the tone ring.

• Check for loose wheel bearings or excessive hub runout.

• Check sensor wiring and connectors for intermittent contact.

• Check condition of ABS sensor head.

• Check mounting of tone ring and condition of teeth.

end has been

detected.

HSA Disabled

ESC/RSC/ATC/

Mismatched

A temporary loss of

Disabled

ABS Wheel

sensor.

• Check condition and retention of ABS sensor spring clip.

• Check ABS sensor cable routing and clipping.

the ABS wheel

speed signal has

ESC/RSC/ATC/

ABS WL

Speed

Drop-Out

voltag e.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

• Turn the wheel at half a revolution per second and verify 0.2 AC volt sensor output

been detected.

HSA Disabled

• Check for loose wheel bearings or excessive hub runout.

sensor.

• Check sensor wiring and connectors for intermittent contact.

• Check mounting of tone ring and condition of teeth.

• Check condition and retention of ABS sensor spring clip as well as the mounting block.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

• Turn the wheel at half a revolution per second and verify 0.2 AC volt sensor output

Brake drag or

chatter has been

detected. Abnormal

vibrations detected

which affect sensor

signal.

Disabled

ABS Wheel

ABS WL

Speed

Abnormal

HSA Disabled

ESC/RSC/ATC/

(Chatter)

voltag e.

ABS Wheel

sensor.

• Check sensor wiring and connectors for intermittent contact.

• Check if brake at this location is operating correctly, i.e., potentially dragging.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

A non-plausible

sensor frequency

has been measured.

Disabled

HSA Disabled

ESC/RSC/ATC/

ABS WL

Too High

Frequency

SPN SID FMI

792 4 7 6 + 3

792 4 8 3 + 3 Excessive Slip ABS WL

Figure 7.8

WABCO Maintenance Manual MM-0112 (Revised 07-18)

792 4 9 5 + 3

792 4 10 3 + 3

792 4 11 5 + 3

792 4 12 5 + 3

4010651a

7 SPN, SID, FMI Fault Codes

Figure7.9

• Adjust wheel sensor to touch tone ring.

Cause Action

Left Third Axle Wheel Speed Sensor

System

Reaction

Light

Warning

Description

Blink

Code

• Check condition of ABS sensor head.

• Check for loose wheel bearings or excessive hub runout.

• Check mounting of ABS tone ring and condition of teeth.

Sensor air gap is too

large, sensor output

Disabled

ABS Wheel

voltag e.

• Check condition and retention of ABS sensor spring clip.

• Check ABS sensor cable routing and clipping.

• Turn the wheel at half a revolution per second and verify 0.2 AC volt sensor output

voltage is too low

but is high enough to

be read by ECU.

System has

HSA Disabled

ESC/RSC/ATC/

• Check for tire size mismatch.

• Check for correct number of tone ring teeth.

detected a

signiﬁcant difference

in the proportion of

Disabled

ABS Wheel

• Verify that ECU is programmed for the correct vehicle.

• Contact WABCO or OEM.

tire diameter to

number of tone ring

teeth between wheel

ends. 10% (+/-2%)

HSA Disabled

ESC/RSC/ATC/

sensor.

• Verify 900-2000 ohms resistance through sensor circuit.

• Verify no DC voltage through sensor circuit Key ON.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

Continuity between

the sensor

connection and

battery voltage

(short circuit) is

detected.

Disabled

ABS Wheel

ESC/RSC/ATC/

ABS WL

UBATT

Shorted to

HSA Disabled

sensor.

• Verify 900-2000 ohms resistance through sensor circuit.

• Check for continuity between the ABS sensor connection and ground.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

• Verify wheel speed sensor wires are not switched left/right.

• Check sensor, sensor cable and connectors to verify no loose or damaged connection.

• Verify 900-2000 ohms resistance through sensor circuit.

• Verify wheel speed sensor wires are not switched left/right.

Continuity between

the sensor

connection and

ground (short circuit)

is detected.

An open circuit has

been detected, i.e.

ECU detects a

disconnected wheel

speed sensor.

Disabled

ABS Wheel

ESC/RSC/ATC/

ABS WL

Ground

Shorted to

HSA Disabled

Disabled

ABS Wheel

ESC/RSC/ATC/

HSA Disabled

sensor.

• Verify 900-2000 ohms resistance through sensor circuit.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

Continuity

interruption between

the sensor

connections (short

circuit) has been

detected.

Disabled

ABS Wheel

ESC/RSC/ATC/

HSA Disabled

SPN SID FMI

Figure 7.9

793 5 1 3 + 6 Air Gap ABS WL

793 5 2 5 + 6 Incorrect Tire ABS WL

793 5 3 4 + 6

793 5 4 4 + 6

793 5 5 4 + 6 Open Circuit ABS WL

793 5 6 4 + 6 Short Circuit ABS WL

4010652a

WABCO Maintenance Manual MM-0112 (Revised 07-18)

7 SPN, SID, FMI Fault Codes

Figure7.10

Cause Action

Wheel speed signal

System

Reaction

ABS Wheel

Light

Warning

Description

Blink

Code

• Check for damaged or missing teeth on tone ring.

• Verify tone ring is not corroded or with contamination.

drops out

periodically at

Disabled

ABS WL

Ring

Incorrect Tone

• Adjust wheel sensor to touch tooth wheel.

• Check sensor gap.

• Check for loose wheel bearings or excessive hub runout.

• Check for mismatch fault of another sensor.

• Verify correct harness location and wiring for sensor.

speeds higher than

6 mph.

Wheel slip over 16

seconds

continuously has

been detected.

A sensor lead from

an incorrect wheel

ESC/RSC/ATC/

HSA Disabled

Disabled

ABS Wheel

ESC/RSC/ATC/

HSA Disabled

Disabled

ABS Wheel

Wires

sensor.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

• Adjust wheel speed sensor until it touches the tone ring.

• Check for loose wheel bearings or excessive hub runout.

• Check sensor wiring and connectors for intermittent contact.

• Check condition of ABS sensor head.

end has been

detected.

HSA Disabled

ESC/RSC/ATC/

ABS WL

Mismatched

A temporary loss of

ABS Wheel

sensor.

• Check mounting of tone ring and condition of teeth.

• Check condition and retention of ABS sensor spring clip.

• Check ABS sensor cable routing and clipping.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

• Turn the wheel at half a revolution per second and verify 0.2 AC volt sensor output

the ABS wheel

speed signal has

been detected.

Disabled

HSA Disabled

ESC/RSC/ATC/

ABS WL

Speed

Drop-Out

voltag e.

• Check for loose wheel bearings or excessive hub runout.

• Check sensor wiring and connectors for intermittent contact.

• Check mounting of tone ring and condition of teeth.

Brake drag or

chatter has been

Disabled

ABS Wheel

Abnormal

sensor.

voltag e.

• Check condition and retention of ABS sensor spring clip as well as the mounting block.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

• Turn the wheel at half a revolution per second and verify 0.2 AC volt sensor output

detected. Abnormal

vibrations detected

which affect sensor

signal.

HSA Disabled

ESC/RSC/ATC/

ABS WL

Speed

(Chatter)

sensor.

• Check sensor wiring and connectors for intermittent contact.

• Check if brake at this location is operating correctly, i.e., potentially dragging.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

A non-plausible

sensor frequency

has been measured.

Disabled

ABS Wheel

ESC/RSC/ATC/

ABS WL

Too High

Frequency

HSA Disabled

SPN SID FMI

793 5 7 6 + 6

793 5 8 3 + 6 Excessive Slip ABS WL

Figure 7.10

WABCO Maintenance Manual MM-0112 (Revised 07-18)

793 5 9 5 + 6

793 5 10 3 + 6

793 5 11 5 + 6

793 5 12 5 + 6

4010653a

Figure7.11

7 SPN, SID, FMI Fault Codes

• Adjust wheel sensor to touch tone ring.

Cause Action

Right Third Axle Wheel Speed Sensor

System

Reaction

Light

Warning

Description

Blink

Code

• Check condition of ABS sensor head.

• Check for loose wheel bearings or excessive hub runout.

• Check mounting of ABS tone ring and condition of teeth.

Sensor air gap is too

large, sensor output

Disabled

ABS Wheel

voltag e.

• Check condition and retention of ABS sensor spring clip.

• Check ABS sensor cable routing and clipping.

• Turn the wheel at half a revolution per second and verify 0.2 AC volt sensor output

voltage is too low

but is high enough to

be read by ECU.

System has

HSA Disabled

ESC/RSC/ATC/

• Check for tire size mismatch.

• Check for correct number of tone ring teeth.

detected a

signiﬁcant difference

in the proportion of

Disabled

ABS Wheel

• Verify that ECU is programmed for the correct vehicle.

• Contact WABCO or OEM.

tire diameter to

number of tone ring

teeth between wheel

ends. 10% (+/-2%)

HSA Disabled

ESC/RSC/ATC/

sensor.

• Verify 900-2000 ohms resistance through sensor circuit.

• Verify no DC voltage through sensor circuit Key ON.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

Continuity between

the sensor

connection and

battery voltage

(short circuit) is

detected.

Disabled

ABS Wheel

ESC/RSC/ATC/

ABS WL

UBATT

Shorted to

HSA Disabled

sensor.

• Verify 900-2000 ohms resistance through sensor circuit.

• Check for continuity between the ABS sensor connection and ground.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

• Verify wheel speed sensor wires are not switched left/right.

• Check sensor, sensor cable and connectors to verify no loose or damaged connection.

• Verify 900-2000 ohms resistance through sensor circuit.

• Verify wheel speed sensor wires are not switched left/right.

Continuity between

the sensor

connection and

ground (short circuit)

is detected.

An open circuit has

been detected, i.e.

ECU detects a

disconnected wheel

speed sensor.

Disabled

ABS Wheel

ESC/RSC/ATC/

ABS WL

Ground

Shorted to

HSA Disabled

Disabled

ABS Wheel

ESC/RSC/ATC/

HSA Disabled

sensor.

• Verify 900-2000 ohms resistance through sensor circuit.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

Continuity

interruption between

the sensor

connections (short

circuit) has been

detected.

Disabled

ABS Wheel

ESC/RSC/ATC/

HSA Disabled

SPN SID FMI

Figure 7.11

794 6 1 3 + 5 Air Gap ABS WL

794 6 2 5 + 5 Incorrect Tire ABS WL

794 6 3 4 + 5

794 6 4 4 + 5

794 6 5 4 + 5 Open Circuit ABS WL

794 6 6 4 + 5 Short Circuit ABS WL

4010654a

WABCO Maintenance Manual MM-0112 (Revised 07-18)

7 SPN, SID, FMI Fault Codes

Figure7.12

Cause Action

Wheel speed signal

System

Reaction

ABS Wheel

Light

Warning

Description

Blink

Code

• Check for damaged or missing teeth on tone ring.

• Verify tone ring is not corroded or with contamination.

drops out

periodically at

speeds higher than

Disabled

ESC/RSC/ATC/

ABS WL

Ring

Incorrect Tone

• Adjust wheel sensor to touch tooth wheel.

• Check sensor gap.

• Check for loose wheel bearings or excessive hub runout.

• Check for mismatch fault of another sensor.

• Verify correct harness location and wiring for sensor.

6 mph.

Wheel slip over 16

seconds

continuously has

been detected.

A sensor lead from

an incorrect wheel

HSA Disabled

Disabled

ABS Wheel

ESC/RSC/ATC/

HSA Disabled

Disabled

ABS Wheel

ABS WL

Wires

sensor.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

• Adjust wheel speed sensor until it touches the tone ring.

• Check for loose wheel bearings or excessive hub runout.

• Check sensor wiring and connectors for intermittent contact.

• Check condition of ABS sensor head.

end has been

detected.

HSA Disabled

ESC/RSC/ATC/

Mismatched

A temporary loss of

ABS Wheel

sensor.

• Check mounting of tone ring and condition of teeth.

• Check condition and retention of ABS sensor spring clip.

• Check ABS sensor cable routing and clipping.

the ABS wheel

speed signal has

Disabled

ESC/RSC/ATC/

ABS WL

Speed

Drop-Out

voltage.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

• Turn the wheel at half a revolution per second and verify 0.2 AC volt sensor output

been detected.

HSA Disabled

sensor.

• Check for loose wheel bearings or excessive hub runout.

• Check sensor wiring and connectors for intermittent contact.

• Check mounting of tone ring and condition of teeth.

• Check condition and retention of ABS sensor spring clip as well as the mounting block.

Brake drag or

chatter has been

detected. Abnormal

Disabled

ABS Wheel

Abnormal

voltag e.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

• Turn the wheel at half a revolution per second and verify 0.2 AC volt sensor output

• Check sensor wiring and connectors for intermittent contact.

• Check if brake at this location is operating correctly, i.e., potentially dragging.

vibrations detected

which affect sensor

HSA Disabled

ESC/RSC/ATC/

ABS WL

Speed

(Chatter)

signal.

A non-plausible

Disabled

ABS Wheel

Frequency

sensor.

• Check for corroded or damaged wiring between the ECU and the ABS wheel speed

sensor frequency

has been measured.

HSA Disabled

ESC/RSC/ATC/

ABS WL

Too High

SPN SID FMI

794 6 7 6 + 5

794 6 8 3 + 5 Excessive Slip ABS WL

Figure 7.12

WABCO Maintenance Manual MM-0112 (Revised 07-18)

794 6 9 5 + 5

794 6 10 3 + 5

794 6 11 5 + 5

794 6 12 5 + 5

4010655a

Figure7.13

7 SPN, SID, FMI Fault Codes

Cause Action

Left Front Modulator Valve

System

Reaction

Light

Warning

Description

Blink

Code

system (11.0-21.0 ohms for 24v system).

• Verify valve resistance of 4.0-9.0 ohm between IV to ground and OV to ground for 12v

• Verify resistance through harness and valve together is the same as valve by itself.

• Verify no voltage between Inlet/Outlet circuit and ground at the valve.

• Verify no voltage through the harness with ECU unplugged and Key ON.

Continuity between

Inlet (IV) or Outlet

(OV) and battery

voltage or another

modulator wire

Disabled

ABS Wheel

ESC/RSC/ATC/

ABS WL

UBATT

Shorted to

• Check for corroded or damaged wiring between the ECU and the modulator valve.

(short circuit) is

detected.

HSA Disabled

system (11.0-21.0 ohms for 24v system).

• Verify valve resistance of 4.0-9.0 ohm between IV to ground and OV to ground for 12v

• Verify resistance through harness and valve together is the same as valve by itself.

• Check if connectors are fully seated and verify no open connections.

• Check for corroded or damaged wiring between the ECU and the modulator valve.

ECU has detected

that Inlet (IV), Outlet

(OV) or both are not

connected.

Disabled

ABS Wheel

ESC/RSC/ATC/

HSA Disabled

system (11.0-21.0 ohms for 24v system).

• Verify valve resistance of 4.0-9.0 ohm between IV to ground and OV to ground for 12v

• Verify resistance through harness and valve together is the same as valve by itself.

• Check for corroded or damaged wiring between the ECU and the modulator valve.

Continuity between

Inlet (IV) or Outlet

(OV) and ground

(short circuit) is

detected.

Disabled

ABS Wheel

HSA Disabled

ESC/RSC/ATC/

ABS WL

Ground

Shorted to

• Verify valve resistance of 4.0-9.0 ohm between IV to ground and OV to ground for 12v

Continuity between

Inlet (IV) or Outlet

Right Front Modulator Valve

ABS Wheel

system (11.0-21.0 ohms for 24v system).

• Verify resistance through harness and valve together is the same as valve by itself.

• Verify no voltage between Inlet/Outlet circuit and ground at the valve.

• Verify no voltage through the harness with ECU unplugged and Key ON.

• Check for corroded or damaged wiring between the ECU and the modulator valve.

(OV) and battery

voltage or another

modulator wire

(short circuit) is

Disabled

HSA Disabled

ESC/RSC/ATC/

ABS WL

UBATT

Shorted to

system (11.0-21.0 ohms for 24v system).

• Verify valve resistance of 4.0-9.0 ohm between IV to ground and OV to ground for 12v

detected.

ECU has detected

Disabled

ABS Wheel

• Check for corroded or damaged wiring between the ECU and the modulator valve.

HSA Disabled

• Verify valve resistance of 4.0-9.0 ohm between IV to ground and OV to ground for 12v

Continuity between

ABS Wheel

system (11.0-21.0 ohms for 24v system).

Inlet (IV) or Outlet

(OV) and ground

Disabled

ABS WL

Shorted to

• Verify resistance through harness and valve together is the same as valve by itself.

• Check if connectors are fully seated and verify no open connections.

that Inlet (IV), Outlet

(OV) or both are not

connected.

ESC/RSC/ATC/

• Verify resistance through harness and valve together is the same as valve by itself.

• Check for corroded or damaged wiring between the ECU and the modulator valve.

(short circuit) is

detected.

HSA Disabled

ESC/RSC/ATC/

Ground

SPN SID FMI

Figure 7.13

795 7 3 2 + 2

795 7 5 2 + 2 Open Circuit ABS WL

795 7 6 2 + 2

796 8 3 2 + 1

796 8 5 2 + 1 Open Circuit ABS WL

796 8 6 2 + 1

4010656a

WABCO Maintenance Manual MM-0112 (Revised 07-18)

7 SPN, SID, FMI Fault Codes

SPN SID FMI

Blink

Code

Description

Warning

Light

System

Reaction

Cause Action

Left Rear Modulator Valve

797 9 3 2 + 4

Shorted to

UBATT

ABS WL

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

Continuity between

Inlet (IV) or Outlet

(OV) and battery

voltage or another

modulator wire

(short circuit) is

detected.

• Verify valve resistance of 4.0-9.0 ohm between IV to ground and OV to ground for 12v

system (11.0-21.0 ohms for 24v system).

• Verify resistance through harness and valve together is the same as valve by itself.

• Verify no voltage between Inlet/Outlet circuit and ground at the valve.

• Verify no voltage through the harness with ECU unplugged and Key ON.

• Check for corroded or damaged wiring between the ECU and the modulator valve.

797 9 5 2 + 4 Open Circuit ABS WL

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

ECU has detected

that Inlet (IV), Outlet

(OV) or both are not

connected.

• Verify valve resistance of 4.0-9.0 ohm between IV to ground and OV to ground for 12v

system (11.0-21.0 ohms for 24v system).

• Verify resistance through harness and valve together is the same as valve by itself.

• Check if connectors are fully seated and verify no open connections.

• Check for corroded or damaged wiring between the ECU and the modulator valve.

797 9 6 2 + 4

Shorted to

Ground

ABS WL

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

Continuity between

Inlet (IV) or Outlet

(OV) and ground

(short circuit) is

detected.

• Verify valve resistance of 4.0-9.0 ohm between IV to ground and OV to ground for 12v

system (11.0-21.0 ohms for 24v system).

• Verify resistance through harness and valve together is the same as valve by itself.

• Check for corroded or damaged wiring between the ECU and the modulator valve.

Right Rear Modulator Valve

798 10 3 2 + 3

Shorted to

UBATT

ABS WL

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

Continuity between

Inlet (IV) or Outlet

(OV) and battery

voltage or another

modulator wire

(short circuit) is

detected.

• Verify valve resistance of 4.0-9.0 ohm between IV to ground and OV to ground for 12v

system (11.0-21.0 ohms for 24v system).

• Verify resistance through harness and valve together is the same as valve by itself.

• Verify no voltage between Inlet/Outlet circuit and ground at the valve.

• Verify no voltage through the harness with ECU unplugged and Key ON.

• Check for corroded or damaged wiring between the ECU and the modulator valve.

798 10 5 2 + 3 Open Circuit ABS WL

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

ECU has detected

that Inlet (IV), Outlet

(OV) or both are not

connected.

• Verify valve resistance of 4.0-9.0 ohm between IV to ground and OV to ground for 12v

system (11.0-21.0 ohms for 24v system).

• Verify resistance through harness and valve together is the same as valve by itself.

• Check if connectors are fully seated and verify no open connections.

• Check for corroded or damaged wiring between the ECU and the modulator valve.

798 10 6 2 + 3

Shorted to

Ground

ABS WL

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

Continuity between

Inlet (IV) or Outlet

(OV) and ground

(short circuit) is

detected.

• Verify valve resistance of 4.0-9.0 ohm between IV to ground and OV to ground for 12v

system (11.0-21.0 ohms for 24v system).

• Verify resistance through harness and valve together is the same as valve by itself.

• Check for corroded or damaged wiring between the ECU and the modulator valve.

4010657a

Figure7.14

Figure 7.14

WABCO Maintenance Manual MM-0112 (Revised 07-18)

Figure7.15

7 SPN, SID, FMI Fault Codes

Cause Action

Left Third Axle Modulator Valve

System

Reaction

Light

Warning

Description

Blink

Code

system (11.0-21.0 ohms for 24v system).

• Verify valve resistance of 4.0-9.0 ohm between IV to ground and OV to ground for 12v

• Verify resistance through harness and valve together is the same as valve by itself.

• Verify no voltage between Inlet/Outlet circuit and ground at the valve.

• Verify no voltage through the harness with ECU unplugged and Key ON.

Continuity between

Inlet (IV) or Outlet

(OV) and battery

voltage or another

modulator wire

Disabled

ABS Wheel

ESC/RSC/ATC/

ABS WL

UBATT

Shorted to

• Check for corroded or damaged wiring between the ECU and the modulator valve.

(short circuit) is

detected.

HSA Disabled

system (11.0-21.0 ohms for 24v system).

• Verify valve resistance of 4.0-9.0 ohm between IV to ground and OV to ground for 12v

• Verify resistance through harness and valve together is the same as valve by itself.

• Check if connectors are fully seated and verify no open connections.

• Check for corroded or damaged wiring between the ECU and the modulator valve.

ECU has detected

that Inlet (IV), Outlet

(OV) or both are not

connected.

Disabled

ABS Wheel

HSA Disabled

ESC/RSC/ATC/

system (11.0-21.0 ohms for 24v system).

• Verify valve resistance of 4.0-9.0 ohm between IV to ground and OV to ground for 12v

• Verify resistance through harness and valve together is the same as valve by itself.

• Check for corroded or damaged wiring between the ECU and the modulator valve.

Continuity between

Inlet (IV) or Outlet

(OV) and ground

(short circuit) is

detected.

Disabled

ABS Wheel

ESC/RSC/ATC/

ABS WL

Ground

Shorted to

HSA Disabled

• Verify valve resistance of 4.0-9.0 ohm between IV to ground and OV to ground for 12v

Continuity between

Inlet (IV) or Outlet

Right Third Axle Modulator Valve

ABS Wheel

system (11.0-21.0 ohms for 24v system).

• Verify resistance through harness and valve together is the same as valve by itself.

• Verify no voltage between Inlet/Outlet circuit and ground at the valve.

• Verify no voltage through the harness with ECU unplugged and Key ON.

• Check for corroded or damaged wiring between the ECU and the modulator valve.

(OV) and battery

voltage or another

modulator wire

(short circuit) is

Disabled

HSA Disabled

ESC/RSC/ATC/

ABS WL

UBATT

Shorted to

system (11.0-21.0 ohms for 24v system).

• Verify valve resistance of 4.0-9.0 ohm between IV to ground and OV to ground for 12v

detected.

ECU has detected

that Inlet (IV), Outlet

Disabled

ABS Wheel

• Verify resistance through harness and valve together is the same as valve by itself.

• Check if connectors are fully seated and verify no open connections.

• Check for corroded or damaged wiring between the ECU and the modulator valve.

• Verify valve resistance of 4.0-9.0 ohm between IV to ground and OV to ground for 12v

(OV) or both are not

connected.

Continuity between

Inlet (IV) or Outlet

Disabled

ABS Wheel

HSA Disabled

ESC/RSC/ATC/

system (11.0-21.0 ohms for 24v system).

• Verify resistance through harness and valve together is the same as valve by itself.

• Check for corroded or damaged wiring between the ECU and the modulator valve.

(OV) and ground

(short circuit) is

detected.

HSA Disabled

ESC/RSC/ATC/

ABS WL

Ground

Shorted to

SPN SID FMI

Figure 7.15

799 11 3 2 + 6

799 11 5 2 + 6 Open Circuit ABS WL

799 11 6 2 + 6

800 12 3 2 + 5

800 12 5 2 + 5 Open Circuit ABS WL

800 12 6 2 + 5

4010658a

WABCO Maintenance Manual MM-0112 (Revised 07-18)

7 SPN, SID, FMI Fault Codes

SPN SID FMI

Blink

Code

Description

Warning

Light

System

Reaction

Cause Action

Engine Retarder Relay, Automatic Third Brake Application Relay

801 13 3 7 + 3

Shorted to

UBATT

ABS WL

Hardwired

Retarder Control

is Disabled

Continuity between

the retarder relay

output and the

battery voltage has

been detected.

• Check for continuity between the retarder relay output and voltage supply.

• Check for corroded or damaged wiring between the ECU and the relay.

• Verify if vehicle is equipped with an engine retarder relay or a third brake relay such as driveline

brake, exhaust brake or engine brake. If hardwired retarder control is not installed on the

vehicle but this fault is present, the operator should perform “Reset Memorized Components”

TOOLBOX™ Software procedure.

• Verify with the OEM if (connector X1 pin 14 Cab ECU or connector X1 pin 5 Frame ECU) circuit

is used on the vehicle, circuit has many possible uses other than a retarder, prior to performing a

“Reset Memorized” or “Reconﬁguring” the ECU.

801 13 5 7 + 3 Open Circuit ABS WL

Hardwired

Retarder Control

is Disabled

ECU has detected

that the retarder relay

is not connected

but was previously

learned.

• Check for broken wires or connectors and verify all connections are fully seated, relay present

and operational.

• Check for corroded or damaged wiring between the ECU and the relay.

• Verify if vehicle is equipped with an engine retarder relay or a third brake relay such as driveline

brake, exhaust brake or engine brake. If hardwired retarder control is not installed on the vehicle

but this fault is present, the operator should perform “Reset Memorized Components” through

TOOLBOX™ Software procedure.

• Verify with the OEM if (connector X1 pin 14 Cab ECU or connector X1 pin 5 Frame ECU) circuit

is used on the vehicle, circuit has many possible uses other than a retarder, prior to performing a

“Reset Memorized” or “Reconﬁguring” the ECU.

801 13 6 7 + 3

Shorted to

Ground

ABS WL

Hardwired

Retarder Control

is Disabled

Continuity between

the retarder relay

output and ground

has been detected.

• Check for continuity between the retarder relay output and ground.

• Check for corroded or damaged wiring between the ECU and the relay.

• Verify if vehicle is equipped with an engine retarder relay or a third brake relay such as driveline

brake, exhaust brake or engine brake. If hardwired retarder control is not installed on the vehicle

but this fault is present, the operator should perform “Reset Memorized Components” through

”TOOLBOX™ Software procedure.

• Verify with the OEM if (connector X1 pin 14 Cab ECU or connector X1 pin 5 Frame ECU) circuit

is used on the vehicle, circuit has many possible uses other than a retarder, prior to performing a

“Reset Memorized” or “Reconﬁguring” the ECU.

Other Components

701 3

Shorted to

UBATT

HSA WL HSA Disabled

AUX1-Output,

shorted to UB

detection.

• A short circuit to UB of the AUX1-Output line was detected.

− HiSA function: The AUX1-Output used in HiSA functionality. The AUX1-line is set with

the HiSA lamp.

701 4

Shorted to

Ground

HSA WL HSA Disabled

AUX1-Output,

shorted to GND

detection.

• A short circuit to GND of the AUX1-Output line was detected.

− HiSA function: The AUX1-Output used for HiSA functionality. The AUX1-line is set

with the HiSA lamp.

701 5 Open Circuit HSA WL HSA Disabled

AUX1-Output, open

circuit detection.

• An interruption of the AUX1-Output line was detected.

− HiSA function: The AUX1-Output used in HiSA functionality. The AUX1-line is set with

the HiSA lamp.

702 3

Shorted to

UBATT

HSA WL HSA Disabled

AUX2-Output,

shorted to UB

detection.

• A short circuit to UB of the AUX2-Output line was detected.

− HiSA function: The AUX2-Output could be used for HiSA functionality. The AUX2-line

is set with the HiSA switch.

702 4

Shorted to

Ground

HSA WL HSA Disabled

AUX2-Output,

shorted to GND

detection.

• A short circuit to GND of the AUX2-Output line was detected.

− HiSA function: The AUX2-Output could be used for HiSA functionality. The AUX2-line

is set with the HiSA switch.

702 5 Open Circuit HSA WL HSA Disabled

AUX2-Output, open

circuit detection.

• An interruption of the AUX2-Output line was detected.

− HiSA function: The AUX2-Output could be used for HiSA functionality. The AUX2-line

is set with the HiSA switch.

4010659a

Figure7.16

Figure 7.16

WABCO Maintenance Manual MM-0112 (Revised 07-18)

Figure7.17

SPN SID FMI

Blink

Code

Description

Warning

Light

System

Reaction

Cause Action

705 3

Shorted to

UBATT

ATC WL EAP Disabled

AUX5-Output,

shorted to UB

detection.

• An interruption of the AUX5 Output line was detected.

− Electronic air processing (EAP) function: The AUX5-output could be used for EAP

functionality. See EAP maintenance manual MM-1696 for further instructions.

705 4

Shorted to

Ground

ATC WL EAP Disabled

AUX5-Output,

shorted to GND

detection.

• An interruption of the AUX5 Output line was detected.

− Electronic air processing (EAP) function: The AUX5-output could be used for EAP

functionality. See EAP maintenance manual MM-1696 for further instructions.

705 5 Open Circuit ATC WL EAP Disabled

AUX5-Output, open

circuit detection.

• An interruption of the AUX5 Output line was detected.

− Electronic air processing (EAP) function: The AUX5-output could be used for EAP

functionality. See EAP maintenance manual MM-1696 for further instructions.

706 3

Shorted to

UBATT

ATC WL EAP Disabled

AUX6-Output,

shorted to UB

detection.

• An interruption of the AUX6 Output line was detected.

− Electronic air processing (EAP) function: The AUX6-output could be used for EAP

functionality. See EAP maintenance manual MM-1696 for further instructions.

706 4

Shorted to

Ground

ATC WL EAP Disabled

AUX6-Output,

shorted to GND

detection.

• An interruption of the AUX6 Output line was detected.

− Electronic air processing (EAP) function: The AUX6-output could be used for EAP

functionality. See EAP maintenance manual MM-1696 for further instructions.

706 5 Open Circuit ATC WL EAP Disabled

AUX6-Output, open

circuit detection.

• An interruption of the AUX6 Output line was detected.

− Electronic air processing (EAP) function: The AUX6-output could be used for EAP

functionality. See EAP maintenance manual MM-1696 for further instructions.

802 14 4 8 + 1

Supply

Voltage is too

Low

ABS WL

(while

supply

voltage is

detected

as too low)

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

The supply voltage

is temporarily too

low.

• Measure the battery or ignition voltage under load. Verify voltage does not drop below

9v (12v system) or 18v (24v system).

• Verify correct ECU and battery ground (less than 1 ohm)

• Check the vehicle battery and associated components (alternator).

• Check for corroded or damaged wiring between the ECU and voltage supply as well as

ground path.

• Check conditions of fuses.

802 14 5 8 + 5

ECU Central

Ground Open

Circuit

ABS WL

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

The ECUs

connection to central

ground has been

interrupted or the

resistance measured

is too high.

• Verify correct ECU central ground (less than 1 ohm resistance).

• Check for corroded, loose or damaged wiring between the ECU and central ground

path.

802 14 7 8 + 3

Internal

Voltage

Supply

ABS WL

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

A failure was

detected on the

internal ECU relay 1.

• Measure the battery or ignition voltage supply. Verify voltage is between 9v-16v (12v

system) or 18v-32v (24v system).

• Verify correct ECU and battery ground (less than 1 ohm).

• Check for corroded or damaged wiring between the ECU and voltage supply as well as

ground path.

• If all wiring checks are within specs and if fault repeats and does not clear, this may

indicate the ECU has failed.

803 15 3 8 + 5

All ABVs

Output

Shorted to

UBATT

ABS WL

ESC/RSC/ATC

Disabled

Continuity between

suspect Active

Braking Valve output

and voltage supply

(short circuit) is

detected.

• Verify 7.0-14.0 ohm between ABV supply and ABV common for 12V system (26.3-49.0

ohm for 24V system).

• Check for continuity between suspect ABV ground circuit and voltage supply.

• Check for corroded or damaged wiring between the ECU and ABV.

• Fault may indicate an issue with the BPS in certain vintage ECUs, See SID 55 FMI 3.

4010660a

7 SPN, SID, FMI Fault Codes

Figure 7.17

WABCO Maintenance Manual MM-0112 (Revised 07-18)

7 SPN, SID, FMI Fault Codes

SPN SID FMI

Blink

Code

Description

Warning

Light

System

Reaction

Cause Action

803 15 4 8 + 1

ECU Voltage

is Too Low

ABS WL

(while

supply

voltage is

detected

as too low)

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

The supply voltage

is temporarily too

low.

• Measure the battery or ignition voltage under load. Verify voltage does not drop below

9v (12v system) or 18v (24v system).

• Verify correct ECU and battery ground (less than 1 ohm).

• Load Test between ECU powers and grounds.

• Check the vehicle battery and associated components (alternator).

• Check for corroded or damaged wiring between the ECU and voltage supply as well as

ground path.

• Check conditions of fuses.

803 15 5 8 + 5

All ABVs High

Impedance

ABS WL

ESC/RSC/ATC/

HSA Disabled

ECU has detected

that the suspect

Active Braking Valve

circuit is not

detected, has high

impedance or the

circuit has been

interrupted.

• Verify 7.0-14.0 ohm between ABV supply and ABV common for 12V system (26.3-49.0

ohm for 24V system).

• Verify if connectors are fully seated, check for corroded or damaged wiring between the

ECU and ABVs.

• Replace ECU if all wiring checks are within spec and if fault repeats and does not clear.

• Fault may indicate an issue with the BPS in certain vintage ECUs, See SID 55 FMI 5.

803 15 6 8 + 5

All ABVs

Shorted to

Ground

ABS WL N/A

Continuity between

suspect Active

Braking Valve circuit

and ground is

detected.

• Verify 7.0-14.0 ohm between ABV supply and ABV common for 12V system (26.3-49.0

ohm for 24V system).

• Check for continuity between suspect Active Braking Valve circuit and ground.

• Check for corroded or damaged wiring between the ECU and ABVs.

• Check ECU grounds should be less than 1 ohm of resistance to ground.

• Replace ECU if all wiring checks are within spec and if fault repeats and does not clear.

803 15 7 8 + 3

Internal

Voltage

Supply

ABS WL

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

A failure was

detected on the

internal ECU relay 2.

• Measure the battery or ignition voltage supply. Verify voltage is between 9v-16v (12v

system) or 18v-32v (24v system).

• Verify correct ECU and battery ground (less than 1 ohm).

• Load test between ECU powers and ground.

• Check for corroded or damaged wiring between the ECU and voltage supply as well as

ground path.

• If all wiring checks are within specs and if fault repeats and does not clear, this may

indicate the ECU has failed.

1045 16 3 7 + 7

E401 and

E404 Version

Only. Pressure

Sensor

Shorted to

UBATT

ABS WL

ESC/RSC/ATC/

HSA Disabled

Continuity between

pressure signal

circuit and voltage

supply (short circuit)

is detected. E401

and E404 version

only.

• Check for continuity between pressure sensor signal circuit and voltage supply.

• Check connectors and pressure sensor for corrosion.

• It could also be possible that the ECU has detected a permanent braking signal from

the pressure sensor between zero to 30 mph.

• Fault only for E401 and E404 versions only.

1045 16 5 7 + 7

E401 and

E404 Version

Only. Pressure

Sensor

Shorted to

Ground

ABS WL

ESC/RSC/ATC/

HSA Disabled

Continuity between

pressure signal

circuit and ground

(short circuit) or an

open circuit is

detected. E401 and

E404 version only.

• Verify if connectors are fully seated, check for corroded or damaged wiring between the

ECU and component.

• Check for continuity between pressure sensor signal circuit and ground.

• The pressure sensor supply line could be also clogged or frozen up.

• Fault only for E401 and E404 versions only.

806 18 3 7 + 2

ABV Drive

Axle. Shorted

to UBATT

ABS WL

ABS Wheel

Disabled

ESC/RSC/ATC/

HSA Disabled

Continuity between

suspect Active

Braking Valve circuit

and voltage supply

(short circuit) is

detected.

• Verify 7.0-14.0 ohm between ABV supply and ABV common for 12V system (26.3-49.0

ohm for 24V system).

• Check for continuity between suspect ABV ground circuit and voltage supply.

• Check for corroded or damaged wiring between the ECU and ABV.

4010661a

Figure7.18

Figure 7.18

WABCO Maintenance Manual MM-0112 (Revised 07-18)

Figure7.19

7 SPN, SID, FMI Fault Codes

• E8 Version only.

Cause Action

Continuity between

System

Reaction

Light

Warning

Description

Blink

Code

49.0 ohm for 24V system).

− Verify 7.0-14.0 ohm between ABV supply and ABV common for 12V system (26.3-

• Check for continuity between suspect Active Braking Valve circuit and ground.

• Check for corroded or damaged wiring between the ECU and ABVs.

suspect Active

Braking Valve circuit

and ground is

detected.

ECU has detected

that the suspect

HSA Disabled

ESC/RSC/ATC/

ABS WL

to ground

ABV Drive

Axle. Shorted

ohm for 24V system).

ECU and ABV.

• Verify 7.0-14.0 ohm between ABV supply and ABV common for 12V system (26.3-49.0

• Verify if connectors are fully seated, check for corroded or damaged wiring between the

Active Braking Valve

circuit is not

detected or the

circuit has been

HSA Disabled

ESC/RSC/ATC/

ABS WL

Circuit

ABV Drive

Axle. Open

ohm for 24V system).

• Verify 7.0-14.0 ohm between ABV supply and ABV common for 12V system (26.3-49.0

interrupted.

Continuity between

suspect Active

ESC/RSC/ATC/

ABV Drive

• Check for continuity between suspect Active Braking Valve circuit and ground.

• Check for corroded or damaged wiring between the ECU and ABVs.

Braking Valve circuit

and ground is

detected.

HSA Disabled

ABS WL

to Ground

Axle. Shorted

ohm for 24V system).

• Verify 7.0-14.0 ohm between ABV supply and ABV common for 12V system (26.3-49.0

• Check for continuity between suspect ABV ground circuit and voltage supply.

• Check for corroded or damaged wiring between the ECU and ABV.

Continuity between

suspect Active

Braking Valve circuit

and voltage supply

(short circuit) is

detected.

ECU has detected

HSA Disabled

ESC/RSC/ATC/

ABS WL

to UBATT

ABV Front

Axle. Shorted

ohm for 24V system).

ECU and ABV.

• Verify 7.0-14.0 ohm between ABV supply and ABV common for 12V system (26.3-49.0

• Verify if connectors are fully seated, check for corroded or damaged wiring between the

• May also indicate incorrect ECU for type of transmission.

that the suspect

Active Braking Valve

circuit is not

detected or the

circuit has been

HSA Disabled

ESC/RSC/ATC/

ABS WL

Circuit

ABV Front

Axle. Open

• Verify 7.0-14.0 ohm between ABV supply and ABV common for 12V system (26.3-49.0

interrupted.

Continuity between

suspect Active

ABV Trailer

ohm for 24V system).

• Check for continuity between suspect ABV ground circuit and voltage supply.

• Check for corroded or damaged wiring between the ECU and ABV.

Braking Valve circuit

and voltage supply

(short circuit) is

detected.

Disabled

ESC/RSC/ATC

ABS WL

UBATT

Control.

Shorted to

ohm for 24V system).

• Verify 7.0-14.0 ohm between ABV supply and ABV common for 12V system (26.3-49.0

• Check for continuity between suspect Active Braking Valve circuit and ground.

• Check for corroded or damaged wiring between the ECU and ABV.

Continuity between

suspect Active

Braking Valve circuit

and ground is

HSA Disabled

ESC/RSC/ATC/

ABS WL

to Ground

ABV Front

Axle. Shorted

ohm for 24V system).

• Verify 7.0-14.0 ohm between ABV supply and ABV common for 12V system (26.3-49.0

detected.

ECU has detected

that the suspect

Active Braking Valve

ABV Trailer

ECU and ABV.

• Verify if connectors are fully seated, check for corroded or damaged wiring between the

• If SLC ECU may indicate issue with diff lock solenoid or transfer case lock solenoid.

circuit is not

detected or the

circuit has been

Disabled

ESC/RSC

ABS WL

Circuit

Control. Open

interrupted.

SPN SID FMI

806 4

806 18 5 7 + 2

Figure 7.19

806 18 6 7 + 2

807 19 1 7 + 6

807 19 2 7 + 6

807 19 3 7 + 6

807 19 4 7 + 6

WABCO Maintenance Manual MM-0112 (Revised 07-18)

807 19 5 7 + 6

4010662a

7 SPN, SID, FMI Fault Codes

Figure7.20

ohm for 24V system).

• Verify 7.0-14.0 ohm between ABV supply and ABV common for 12V system (26.3-49.0

Cause Action

Continuity between

suspect Active

Braking Valve circuit

System

Reaction

ESC/RSC

Light

Code

Control.

ABV Trailer

ABS WL

Warning

Description

Blink

• Check for continuity between suspect Active Braking Valve circuit and ground.

• Check for corroded or damaged wiring between the ECU and ABV.

and ground is

Disabled

Ground

Shorted to

• Verify if vehicle is equipped with Dual Trailer Stability Control Modulator Valve (ABV 3/2

detected.

Continuity between

solenoid + Modulator valve) or Hill Start Aid switch and lamp. Depending on the vehicle

conﬁguration, these components use Aux 1 through 4.

Auxiliary port circuits

and voltage supply

HSA Disabled

ESC/RSC/ATC/

ABS WL

4. Shorted to

Aux 1, 2, 3 or

3/2 solenoid + Modulator valve) or Hill Start Aid switch* and lamp. Depending on the

• Check for continuity between component and voltage supply.

(short circuit) is

UBATT

vehicle conﬁguration, these components use Aux 1 through 4.

• Check for corroded or damaged wiring between the ECU and component.

• Verify if vehicle is equipped with Dual Trailer Stability Control Modulator Valve (ABV

detected.

ECU has detected

ECU and component.

• Check for continuity between component and ECU.

• Verify if connectors are fully seated, check for corroded or damaged wiring between the

• If hardwired components for Aux 1-4 are not installed on the vehicle but are checked as

auxiliary port circuit

or circuit was once

learned and it is no

longer available.

Disabled

ESC/RSC

ABS WL

Circuit

4. Open

Aux 1, 2, 3 or

learned in TOOLBOX™ Software and this fault is present, the operator should perform

• HSA switch open fault detection is not activated in ECU as switch could be multiplexed.

an open circuit in

“Reset Memorized Components” through TOOLBOX™ Software procedure.

• If SLC ECU may indicate issue with Diff lock solenoid or transfer case lock solenoid.

3/2 solenoid + Modulator valve) or Hill Start Aid switch* and lamp. Depending on the

vehicle conﬁguration, these components use Aux 1 through 4.

• Verify if vehicle is equipped with Dual Trailer Stability Control Modulator Valve (ABV

Continuity between

ECU and component.

• Check for continuity between Auxiliary port component and ground.

• Verify if connectors are fully seated, check for corroded or damaged wiring between the

auxiliary port circuit

and ground is

detected.

Disabled

ESC/RSC

ABS WL

Ground

4. Shorted to

Aux 1, 2, 3 or

continuity to battery voltage with Key On.

• Verify SAS, ESC and ECU are correctly connected.

• Disconnect ECU, SAS and ESC module and check wiring between components for

• Check for corroded or damaged wiring between the ECU, SAS and ESC.

• Verify SAS, ESC and ECU are correctly connected.

• Check for corroded or damaged wiring between the ECU, SAS and ESC.

Continuity between

SAS or ESC supply

line and high voltage

supply is detected.

ECU has detected

an open circuit in

between SAS or

ESC supply line and

ABS WL N/A

to UBATT

SAS & ESC

line. Shorted

Module supply

ABS WL N/A

Circuit

line. Open

SAS & ESC

Module supply

continuity to ground.

• Verify SAS, ESC and ECU are correctly connected.

• Disconnect ECU, SAS and ESC module and check wiring between components for

• Check for corroded or damaged wiring between the ECU, SAS and ESC.

ECU.

Continuity between

SAS or ESC supply

line and ground is

detected.

Disabled

ESC/RSC

ABS WL

to Ground

SAS & ESC

line. Shorted

Module supply

and the ABS ECU.

• Check availability of engine data information and communication between engine ECU

• Contact OEM to verify engine is correctly broadcasting tire size.

Tire size data has

not been received

from engine ECU at

start up. E452

version only.

Disabled

ATC/HSA

ABS/ESC/RSC/

(Only at

start up)

ABS WL

error

Tire size

broadcast

SPN SID FMI

807 19 6 7 + 6

807 19 7 7 + 6

Figure 7.20

WABCO Maintenance Manual MM-0112 (Revised 07-18)

807 19 8 7 + 6

807 19 9 7 + 6

807 19 10 N/A

807 19 11 8 + 6

807 19 12 8 + 6

810 22 8 7 + 1

4010663a

Figure7.21

SPN SID FMI

Blink

Code

Description

Warning

Light

System

Reaction

Cause Action

810 22 14 3 + 7

ABS

Complete

Shut-off

ABS WL

Complete

Shut-Off

It was detected by

the ABS ECU, that

the number of stored

wheel speed sensor

failures is greater

than 100. An

absence of repair is

the cause of this

failure. If this failure

is detected, ABS

completely shuts-off.

• Repair all other active faults and road test vehicle over 4 mph.

• Check sensor adjustment, condition of tone rings, wheel end play. This fault is

generated by speed signal issues and usually is a wheel end issue.

• Once sensor issue has been corrected, may try to perform “Reset Memorized” to clear

code.

811 23 5 7 + 4

Warning Light

Relay

(E-Frame)

ABS WL if

grounded.

Off if

burned out

N/A

Output detects no

load to battery or is

permanently

grounded.

• Verify ABS WL is working correctly during self test.

• Verify wire and/or bulb is not damaged.

• Blink code activation via switch longer than 16 sec could cause. Verify blink code switch

is not permanently grounded.

1045 55 3 7 + 7

Pressure

Sensor

Shorted to

UBATT

ABS WL

ESC/RSC/ATC/

HSA Disabled

Continuity between

pressure signal

circuit and voltage

supply (short circuit)

is detected.

• Verify if connectors are fully seated, check for corroded, damaged or shorted

connectors or wiring between the ABS ECU and the pressure sensor.

• Verify there is no continuity between pressure sensor signal circuit and voltage supply.

• It could also be possible that the ECU has detected a permanent braking signal from

the pressure sensor between zero to 30 mph.

• If all wiring and connector checks pass, may indicate a pressure sensor failure.

• If DTC persists after completing previous checks and repairs, may indicate the ECU

has failed.

1045 55 5 7 + 7

Pressure

Sensor

Shorted to

Ground

ABS WL

ESC/RSC/ATC/

HSA Disabled

Continuity between

pressure signal

circuit and ground

(short circuit) or an

open circuit is

detected.

• Verify if connectors are fully seated, check for corroded, damaged or shorted

connectors or wiring between the ABS ECU and the pressure sensor.

• Verify there is no continuity between pressure sensor signal circuit and ground.

• Verify there is 8.0-16.0 volts across pins 1-2 at the pressure sensor harness connector.

• If all wiring and connector checks pass, may indicate a pressure sensor failure.

• If no voltage is found, verify if the ECU will self-test.

• If no self-test, verify power and ground to the ECU.

• If DTC persists after completing previous checks and repairs, may indicate the ECU

has failed.

1045 55 7 7 + 7

CAN BLS

(Brake light

Switch) Signal

Faulty

ABS WL RSC Disabled

Fault only for RSC

systems with ECU

E440. ECU has

detected the brake

light switch signal is

faulty.

• Refer to OEM Brake light switch troubleshooting.

• Check the BLS switch (installation, wire, connector).

• Only relevant for RSC systems without Pressure Sensor installed, with BLS over CAN

Bus and ECU E440 only.

1049 3

Pressure

Sensor

Shorted to

UBATT

ABS WL

ESC/RSC/ATC/

HSA Disabled

Permanent positive

pressure signal

detection.

• Check for continuity between pressure sensor signal circuit and voltage supply.

• Check connectors and pressure sensor for corrosion.

• It could also be possible that the ECU has detected a permanent braking signal from

the pressure sensor between zero to 30 mph.

1049 5

Pressure

Sensor Open

Circuit or

Shorted to

Ground

ABS WL

ESC/RSC/ATC/

HSA Disabled

Permanent 0 psi

pressure detection.

• Verify if connectors are fully seated, check for corroded or damaged wiring between the

ECU and component.

• Check for continuity between pressure sensor signal circuit and ground.

• The pressure sensor supply line could be also clogged or frozen up.

• Call WABCO North America Customer Care at 855-228-3203 with the part

number to ensure ECU is correct for the application.

4010664a

7 SPN, SID, FMI Fault Codes

Figure 7.21

WABCO Maintenance Manual MM-0112 (Revised 07-18)

7 SPN, SID, FMI Fault Codes

SPN SID FMI

Blink

Code

Description

Warning

Light

System

Reaction

Cause Action

1050 1

EAP Sensor

Data Erratic or

Incorrect

ATC WL EAP Disabled

ABS system

pressure is below

set value.

• See EAP maintenance manual MM-1696.

1052 3

EAP Pressure

Sensor

Shorted to

UBATT

ATC WL EAP Disabled

Continuity between

pressure signal

circuit and voltage

supply (short circuit)

is detected.

• Check for continuity between pressure sensor signal circuit and voltage supply.

• Check connectors and pressure sensor for corrosion.

1052 5

EAP Pressure

Sensor

Shorted to

Ground

ATC WL EAP Disabled

Continuity between

pressure signal

circuit and ground

(short circuit) or

an open circuit is

detected.

• Check for continuity between pressure sensor signal circuit and voltage supply.

• Check connectors and pressure sensor for corrosion.

1055 3

EAP Pressure

Sensor

Shorted to

UBATT

ATC WL EAP Disabled

Continuity between

pressure signal

circuit and voltage

supply (short circuit)

is detected.

• Check for continuity between pressure sensor signal circuit and voltage supply.

• Check connectors and pressure sensor for corrosion.

1055 5

EAP Pressure

Sensor

Shorted to

Ground

ATC WL EAP Disabled

Continuity between

pressure signal

circuit and ground

(short circuit) or

an open circuit is

detected.

• Check for continuity between pressure sensor signal circuit and voltage supply.

• Check connectors and pressure sensor for corrosion.

1056 3

ABV Trailer

Shorted to

UBATT

ABS WL

ESC/RSC/ATC

Disabled

E8 version only.

Continuity between

suspect Active

Braking Valve circuit

and voltage supply

(short circuit) is

detected.

• Verify 7.0-14.0 ohm between ABV supply and ABV common for 12V system (26.3-49.0

ohm for 24V system).

• Check for continuity between suspect ABV ground circuit and voltage supply.

• Check for corroded or damaged wiring between the ECU and ABV.

1056 4

ABV Trailer

Shorted to

Ground

ABS WL

ESC/RSC

Disabled

E8 version only.

Continuity between

suspect Active

Braking Valve circuit

and ground is

detected.

• Verify 7.0-14.0 ohm between ABV supply and ABV common for 12V system (26.3-49.0

ohm for 24V system).

• Check for continuity between suspect Active Braking Valve circuit and ground.

• Check for corroded or damaged wiring between the ECU and ABV.

1056 5

ABV Trailer

Open Circuit

ABS WL

ESC/RSC

Disabled

E8 version only.

ECU has detected

that the suspect

Active Braking

Valve circuit is not

detected or the

circuit has been

interrupted.

• Verify 7.0-14.0 ohm between ABV supply and ABV common for 12V system (26.3-49.0

ohm for 24V system).

• Verify if connectors are fully seated, check for corroded or damaged wiring between the

ECU and ABV.

4010665a

Figure7.22

Figure 7.22

WABCO Maintenance Manual MM-0112 (Revised 07-18)

Figure7.23

7 SPN, SID, FMI Fault Codes

Cause Action

Tire pressure loss

System

Reaction

Light

Warning

Description

Blink

Code

• Check and correct tire pressure.

• Only available if ECU has been programmed for TPM use.

detected by change

of wheel

circumference.

N/A

is set

ATC WL if

Parameter

Tire Pressure

Monitor (TPM)

• Check harness to ensure that modulators are connected and check fuses.

E8 version only.

The ECU detects

that no modulators

are connected.

This is a common

Disabled

ABS Wheel

ABS WL

No Loads

fault during end

of line testing or

programming if only

the X1 connector is

connected.

HSA Disabled

ESC/RSC/ATC/

Detected

• Verify if ECU is correct for vehicle application.

• Contact vehicle OEM to verify broadcast of HSA switch is correct.

It was detected that

HSA was

continuously active

for more than 90s

or ECU detected no

HSA switch

HSA WL HSA Disabled

Fault

HSA Active

ESC

information in the

EBC1 Message if

switch is multiplexed.

• Follow the ESC Initialization (End of Line) calibration.

ECU has recognized

that the ESC module

is currently in

initialization mode

and has not been

completed.

ESC Disabled

Blinking

ATC WL

ESC

Initialization

Not Complete

the ABS ECU.

Conﬁguration

circuits.

• Check CAN wiring between ABS-ECU and ESC-module for interruptions and short

• Check CAN wiring between ABS-ECU and SAS for interruptions and short circuits.

• Check for corroded or damaged wiring between the ECU, SAS and ESC Module.

Loss of CAN

communication

between the ESC

module and the ABS

ATC WL ESC Disabled

ESC CAN

Datalink Fault

ECU.

• Verify correct ABS ECU with OEM.

The ESC module is

not compatible with

ATC WL ESC Disabled

ESC System

WABCO North America Customer Care at 855-228-3203 to ensure ESC

module mounting is in accordance with ABS ECU parameters.

• Verify ESC module is securely mounted, leveled and in correct location. Contact

E8 version only.

The ESC module

mounting is not in

accordance with

speciﬁcation.

ATC WL ESC Disabled

Fault

Mounting

ESC Module

SPN SID FMI

1069 79 1 7 + 8

Figure 7.23

1204 5

2622 94 2 7 + 1

520210 88 1 N/A

520210 88 2 8 + 6

520210 88 5 7 + 1

520210 7

4010666a

WABCO Maintenance Manual MM-0112 (Revised 07-18)

7 SPN, SID, FMI Fault Codes

SPN SID FMI

Blink

Code

Description

Warning

Light

System

Reaction

Cause Action

520210 88 9 7 + 1

ESC CAN

messages

missing, data

erratic or

incorrect

ATC WL ESC Disabled

Data communication

between the ESC

module, SAS and

the ABS ECU is

missing or incorrect.

• Check CAN wiring between ABS-ECU and ESC-module for interruptions and short

circuits.

• Check CAN wiring between ABS-ECU and SAS for interruptions and short circuits.

• Check for corroded or damaged wiring between the ECU, SAS and ESC Module.

520210 10

ESC

Plausibility

ATC WL ESC Disabled

The ESC system

detects a plausibility

issue while driving

(straight line).

• Check that SAS and ESC module are correctly mounted, leveled, and in correct

location. Contact WABCO North America Customer Care at 855-228-3203

to ensure ESC module and SAS are mounted in accordance with ECU

parameters.

520210 88 12 8 + 6

ESC System

Failure

ATC WL ESC Disabled

ECU has detected

ESC system failure

due to missing or

incorrect data from

ESC Module or SAS.

• Check CAN wiring between ABS-ECU, ESC-module and SAS for interruptions and

short circuits.

• Check for corroded or damaged wiring between the ECU, SAS and ESC Module.

• Check for stray single power wires on or near the ESC module.

• Check for damaged or incorrectly mounted SAS.

• Verify ESC module is securely mounted, leveled and in correct location.

• Verify ABS ECU and ESC has been correctly calibrated. Follow the ESC Initialization

(End of Line) calibration. Refer to Section 8.

520210 88 13 8 + 6

ESC

Initialization

required

ATC WL ESC Disabled

The system has

detected that the

ABS ECU, ESC

module or

parameters were

exchanged and ESC

initialization is

required.

• Follow the ESC Initialization (End of Line) calibration.

520210 88 14 8 + 6

ESC Module

Mounting

Fault

ATC WL ESC Disabled

E4 version: The ESC

module mounting is

not in accordance

with speciﬁcation.

E8 version: ESC

Initialization not

Completed.

• E4 version: Verify ESC module is securely mounted, leveled and in correct location.

Contact WABCO North America Customer Care at 855-228-3203 to ensure

ESC module mounting is in accordance with ABS ECU parameters.

• E8 version: Follow the ESC Initialization (End of Line) calibration procedure for E8

version ECUs.

520211 7

Liftaxle

Plausibility

Fault

ATC WL ESC Disabled

The system has

detected that

the ABS ECU

parameters are not

plausible.

• Contact WABCO North America Customer Care at 855-228-3203 to ensure

that the ECU parameter setting is correct for the vehicle.

1807 89 1 8 + 6

SAS Offset

Fault

ATC WL ESC Disabled

The Steering Angle

Sensor offset is out

of tolerance.

• Check for damaged or incorrectly mounted SAS.

• If work has been performed on the vehicle which affects the steering system or front

end alignment, perform SAS Calibration and ESC Initialization. Refer to Section 8.

1807 89 2 8 + 6

SAS Not

Plausible

ATC WL ESC Disabled

The ESC module

has detected an

implausible steering

angle compared to

the measured yaw

rate.

• Check for correct mounting of the SAS and ESC module.

4010667a

Figure7.24

Figure 7.24

WABCO Maintenance Manual MM-0112 (Revised 07-18)

Figure7.25

7 SPN, SID, FMI Fault Codes

• Check CAN wiring between ABS-ECU and SAS for interruptions and short circuits.

Cause Action

The steering wheel

System

Reaction

Light

Warning

Description

Blink

Code

parameter setting of ABS ECU and SAS compatibility.

• Check for corroded or damaged wiring between the SAS and ESC Module.

• Contact WABCO North America Customer Care at 855-228-3203 to check

• Check for correct mounting of the SAS and ESC module.

angle signal is

not available after

ignition on.

The calculated

ATC WL ESC Disabled

Fault

SAS Datalink

end alignment, perform SAS Calibration and ESC Initialization. Refer to Section 8.

• If work has been performed on the vehicle which affects the steering system or front

steering ratio of the

ATC WL ESC Disabled

Steering Ratio

• Verify SAS is correctly mounted.

• Perform SAS Calibration and ESC Initialization. Refer to Section 8.

vehicle is not

plausible.

The Steering Angle

Sensor calibration

ATC WL ESC Disabled

SAS

Fault

Calibration

failed.

Fault

• Check harness between ABS ECU and SAS.

• Check parameter setting of ABS ECU.

• Check SAS operation if fault persists.

Data communication

faults with ESC

module.

ESC Disabled

(temp possible)

(temp)

ATC WL

Fault

SAS CAN

• Check CAN wiring between ABS-ECU and SAS for interruptions and short circuits.

The Steering Angle

Sensor is

communicating an

• Check for corroded or damaged wiring between the SAS and ESC Module.

internal error to the

ABS ECU.

The ECU has

SAS not

• Follow the SAS calibration procedure. Refer to Section 8.

detected that SAS

out of calibration.

ATC WL ESC Disabled

Calibrated

• Check the installation and condition of the SAS and steering system.

The Steering Angle

Sensor is

communicating an

ATC WL ESC Disabled

Fault

SAS Internal

• Check CAN wiring between ABS-ECU and SAS for interruptions and short circuits.

• Check for corroded or damaged wiring between the SAS and ESC Module.

internal error to the

ABS ECU.

Continuity between

suspect ESC supply

SAS and

ESC Module

setting of ABS ECU and SAS compatibility.

• Contact WABCO North America Customer Care at 855-228-3203 to check parameter

circuit and voltage

supply (short circuit)

ATC WL ESC Disabled

Supply

Shorted to

• Check CAN wiring between ABS-ECU and SAS for interruptions and short circuits

is detected.

Continuity between

UBATT

SAS and

ESC Module

parameter setting of ABS ECU and SAS compatibility.

• Check for corroded or damaged wiring between the SAS and ESC Module.

• Contact Meritor OnTrac™ Customer Call Center at 866-OnTrac1 (668-7221) to check

suspect ESC supply

circuit and ground is

detected.

ATC WL ESC Disabled

Supply

Ground

Shorted to

SPN SID FMI

1807 4

Figure 7.25

1807 89 7 8 + 6

1807 89 8 7 + 1

1807 89 9 7 + 1

1807 89 12 8 + 6 SAS Failure ATC WL ESC Disabled

1807 89 13 8 + 6

1807 89 14 8 + 6

3509 3

4010668a

WABCO Maintenance Manual MM-0112 (Revised 07-18)

3509 4

7 SPN, SID, FMI Fault Codes

Figure7.26

Cause Action

Datalink J1939

System

Reaction

Light

Warning

Description

Blink

Code

• Check tire size and verify ECU is for the correct vehicle application.

Received vehicle

speed and ABS

vehicle speed is

incorrect.

Supervision

ABS WL N/A

Erratic,

Data Link

SAE J1939

VSC1 Speed

normally not

activated.

Incorrect

Intermittent or

ECU and J1939 backbone.

• If ABS ECU is only vehicle ECU not communicating, verify J1939 wiring between ABS

• Resistance should be 60 ohms between J1939 high and low.

SAE J1939

the high side has 2.5 to 5 volts and the low side has 2.49 volts or less. The readings

will ﬂuctuate but should be in range and should never be the same. The total of both

• Key on, check voltage to ground at the ECU harness connector J1939 pins and verify

communication is

not possible.

HSA Disabled

ESC/RSC/ATC/

ABS WL

Circuit

Data Link

Open or Short

readings together should be approximately 5 volts.

ECU and J1939 backbone.

• If ABS ECU is only vehicle ECU not communicating, verify J1939 wiring between ABS

• Resistance should be 60 ohms between J1939 high and low.

SAE J1939

ESC/RSC/ATC/

SAE J1939

the high side has 2.5 to 5 volts and the low side has 2.49 volts or less. The readings

will ﬂuctuate but should be in range and should never be the same. The total of both

readings together should be approximately 5 volts.

• Key on, check voltage to ground at the ECU harness connector J1939 pins and verify

communication is

not possible.

HSA Disabled

ABS WL

No Access

is correct and messages are correct.

ECU and J1939 backbone.

the high side has 2.5 to 5 volts and the low side has 2.49 volts or less. The readings

will ﬂuctuate but should be in range and should never be the same. The total of both

readings together should be approximately 5 volts.

• Contact OEM to verify J1939 wiring between engine ECU and vehicle J1939 backbone

• If ABS ECU is only vehicle ECU not communicating, verify J1939 wiring between ABS

• Resistance should be 60 ohms between J1939 high and low.

There is either too

much time in

between EEC1

broadcasts from the

HSA Disabled

ESC/RSC/ATC/

ABS WL

EEC1

Data Link

SAE J1939

• Key on, check voltage to ground at the ECU harness connector J1939 pins and verify

engine or the

message content is

not as expected.

Timeout

• Verify J1939 wiring between external ECU which is sending request and J1939

The external brake

request message

the high side has 2.5 to 5 volts and the low side has 2.49 volts or less. The readings

backbone.

System such as OnGuard™.

• This message is most likely to come from Adaptive Cruise or a Collision Mitigation

(XBR) is expected

but is not being

received in expected

time or not at all.

XBR Disabled

ABS WL

Temporary

SAE J1939

XBR Timeout

• Verify J1939 wiring between ABS ECU and J1939 backbone.

• Resistance should be 60 ohms between J1939 high and low.

• Key on, check voltage to ground at the ECU harness connector J1939 pins and verify

An internal fault

related to the CAN

controller is

Disabled

ABS Wheel

ESC/RSC/ATC/

ABS WL

SAE J1939

Internal Error

will ﬂuctuate but should be in range and should never be the same. The total of both

detected.

backbone.

readings together should be approximately 5 volts.

HSA Disabled

System such as OnGuard™.

• Verify J1939 wiring between external ECU which is sending request and J1939

• This message is most likely to come from Adaptive Cruise or a Collision Mitigation

The external brake

request message

(XBR) has been

received incorrectly.

XBR Disabled

ABS WL

Temporary

SAE J1939

XBR Timeout

SPN SID FMI

639 231 2 7 + 1

639 231 5 7 + 1

Figure 7.26

WABCO Maintenance Manual MM-0112 (Revised 07-18)

639 231 6 7 + 1

639 231 9 7 + 1

639 231 10 7 + 1

639 231 12 7 + 1

639 231 13 7 + 1

4012655a

Figure7.27

7 SPN, SID, FMI Fault Codes

Cause Action

The electronic

System

Reaction

Light

Warning

Description

Blink

Code

backbone.

• Verify J1939 wiring between external ECU which is sending request and J1939

• This message is most likely to come from a steering tag axle controller.

steering control

message (ESC1) is

expected but is not

being received in

expected time or not

at all.

ATC WL ESC Disabled

Data Link

SAE J1939

ESC1 Timeout

• Measure the battery or ignition voltage under load. Check the vehicle battery and

Internal

A supply voltage

ABS Wheel

associate components (alternator).

being used with a 12V ECU.

ground path.

• Check the battery and ensure it is correct for the ECU, i.e., ensure a 24V battery is not

• Check for corroded or damaged wiring between the ECU and voltage supply as well as

which is too high

has been measured

by the ECU for more

than 5 seconds.

Disabled

HSA Disabled

ESC/RSC/ATC/

E8 Version only.

The ECU

memorized

system is not in

accordance with the

ABS Wheel

ABS System

number to ensure ECU is correct for the application.

• Check number of sensors and modulators and correct wiring compared to ECU type.

• Call WABCO North America Customer Care at 855-228-3203 with part

harness. There are

loads detected at

outputs which

should be open

circuits. Wheel

Disabled

HSA Disabled

ESC/RSC/ATC/

ABS WL

Wheel

Incorrect

EEPROM

Parameter

Conﬁguration

parameters (number

of tone ring teeth or

tire size) are out of

• Verify data link circuit voltage and resistance.

• Try engine derate test. If test fails, indicates issue with data link circuit.

tolerance.

ABS ECU can see

ATC valve but not

the data link.

The ECU

memorized

system is not in

accordance with the

ABS WL ATC Disabled

AT C

Issue

Conﬁguration

Incorrect ABS

conﬁgurations.(Parameters and installed components are not matching).

engine data information and communication between Engine ECU and the ABS ECU.

• Check number of sensors, modulators, 3/2 valves and other components match ECU

• Verify the installed wheel size matches ECU wheel parameter.

• On E452 ECUs with tire data available on request: check Engine ECU, availability of

harness. There are

loads detected at

outputs which

should be open

circuits. Wheel

parameters (number

of tone ring teeth or

tire size) are out of

tolerance.

Disabled

ABS Wheel

HSA Disabled

ESC/RSC/ATC/

ABS WL

Wheel

System

EEPROM or

Conﬁguration.

Incorrect

Parameter

SPN SID FMI

639 231 14 7 + 1

Figure 7.27

627 251 3 8 + 2 Overvoltage ABS WL

631 2

630 253 1 7 + 5

630 253 2 8 + 2

4012656a

WABCO Maintenance Manual MM-0112 (Revised 07-18)

7 SPN, SID, FMI Fault Codes

Figure7.28

Cause Action

There is an incorrect

System

Reaction

Light

Warning

Description

Blink

Code

• Reset ECU by cycling the ignition or by using the reset option in TOOLBOX™.

• Retry the programming that was being attempted.

checksum in the

EEPROM. A

diagnostic tool may

have been

Disabled

ABS Wheel

ABS WL

EEPROM

Checksum

disconnected during

active diagnosis or

programming.

HSA Disabled

ESC/RSC/ATC/

• Check number of sensors and modulators and correct wiring compared to ECU type.

The ECU

memorized system

is not in accordance

with the harness.

Disabled

ABS Wheel

HSA Disabled

ESC/RSC/ATC/

ABS WL

Fault

ABS System

• Contact vehicle OEM to obtain correct ECU part number for vehicle.

The stability control

parameters set in

the ECU are not in

accordance with

what is detected or

learned on the

vehicle.

ABS WL ESC Disabled

ESC

Incorrect

EEPROM

Parameter

• Check harness to ensure that modulators are connected and check fuses.

The ECU detects

that no modulators

are connected. This

is a common fault

during end of line

testing or

Disabled

ABS Wheel

ESC/RSC/ATC/

ABS WL

Detected

No Loads

programming if only

the X1 connector is

connected.

One axle is detected

to be rotating much

HSA Disabled

faster than another.

This fault is common

if vehicle has been

on a dyno and

Disabled

ABS Wheel

• Use the “Disable ATC” diagnostic command when the vehicle is on a Dyno.

• Check for excessive ABS sensor gap on multiple wheel ends.

detection is not

disabled via

diagnostic

command. It is also

possible that there

HSA Disabled

ESC/RSC/ATC/

are excessive

sensor air gaps on

multiple wheel ends.

SPN SID FMI

630 253 12 8 + 4

Figure 7.28

WABCO Maintenance Manual MM-0112 (Revised 07-18)

630 253 13 8 + 4

630 253 14 8 + 6

629 254 5 8 + 4

629 254 8 7 + 1 Excessive Slip ABS WL

4012657a

Figure7.29

7 SPN, SID, FMI Fault Codes

Cause Action

System

Reaction

ABS Wheel

Light

Warning

Description

Blink

Code

• Adjust wheel sensor to touch tone ring.

• Check condition of ABS sensor head.

• Check for loose wheel bearings or excessive hub runout.

• Check mounting of ABS tone ring and condition of teeth.

• Check condition and retention of ABS sensor spring clip.

An ABS modulator

was activated for an

abnormally long

time.

Disabled

ESC/RSC

ATC Disabled if

ABS WL

Time

Activation

Modulator

Excessive

• Check ABS sensor cable routing and clipping.

Fault on Driven

Wheel

There are multiple

causes. Valves may

ABS Wheel

• Reset ECU by cycling the ignition or by using the reset option in TOOLBOX™.

have been activated

ECU has failed.

• If fault persists, check ABS ECU powers, grounds and load test.

• After checking powers, grounds and load testing, if fault still persists may indicate the

too long during

diagnostic testing.

Internal ECU

communication is

not correct.

Disabled

HSA Disabled

ESC/RSC/ATC/

speciﬁcation.

• Verify that the ECU is securely mounted, leveled and in correct location as per OEM

• Reset ECU by cycling the ignition or by using the reset option in TOOLBOX™.

The measured

lateral acceleration

by the ECU is out of

range.

ABS WL RSC Disabled

Out of Range

Accelerometer

speciﬁcation.

• Verify that the ECU is securely mounted, leveled and in correct location as per OEM

• Reset ECU by cycling the ignition or by using the reset option in TOOLBOX™.

The measured

lateral

acceleration is not

plausible or the

learned offset is too

high. ECU may be

mounted incorrectly.

ABS WL RSC Disabled

ECU

Mounting,

Not Plausible

Accelerometer

Figure 7.29

SPN SID FMI

629 254 9 2 + 1

629 254 12 8 + 3 Internal Error ABS WL

629 254 13 8 + 6

629 254 14 8 + 6

4012658a

WABCO Maintenance Manual MM-0112 (Revised 07-18)

8 Appendix I

Reconfiguration Procedure

How to Reconfigure an ECU (E Version)

Before reconfiguring the ECU, contact WABCO North America at 855-228-3203 for additional information.

E version ECUs will automatically learn and memorize the following components if they are connected at start up:

앫 ATC valve

앫 Retarder relay or third brake relay

앫 Datalink SAE J1939

앫 Auxiliary inputs and outputs 1-5

NOTE: Depending on the ECU configuration (RSC, ESC or HSA), ATC Valve and auxiliary 1 through 5 cannot be reconfigured to remove these components. Only the retarder relay is memorized or cleared.

Once these components have been memorized, the ECU will look for them at each start up. If a memorized component is not present, the ECU will record a fault. For example, if an ATC valve is memorized, but is not present at the next start up, the ECU records a fault. This can occur if an ECU is moved from one truck to another and one or more of the memorized components are not available on the new truck. If this occurs, use TOOLBOX™ Software to reconfigure the ECU. If you do not have TOOLBOX™ Software, follow the manual reconfiguration instructions in this section.

Figure8.1

WABCO ABS

4010669a

Figure 8.1

Figure8.2

WABCO Toolbox – Pneumatic ABS Diagnostics

4010670a

Figure 8.2

TOOLBOX™ Software

NOTE: For complete instructions for using TOOLBOX™ Software,

refer to the TOOLBOX™ User’s Manual, TP-99102.

To reconfigure the ECU with TOOLBOX™ Software, use the Reset Memorized command.

Select Reset Memorized from the pull-down menu to tell the ECU to reset the memorized or “learned” components. Figure 8.1. If you are using TOOLBOX™ Software version 11 or higher, choose Components, Memorized Components and Reset Memorized. Figure 8.2 and Figure 8.3.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

8 Appendix I

4010671a

WABCO Toolbox – Memorized Components

Figure8.3

Figure 8.3

NOTE: Vehicle Ignition must be cycled and vehicle test driven over 4 mph (6.4 kph) to complete reset memorization.

Manual Reconfiguration

Refer to Table C and Figure 8.4 for information on manual reconfiguration.

Table C:

Action Result Reason

1. Turn the ignition ON.

2. Press and hold the blink switch

for at least three seconds.

NOTE: Do not hold this switch

longer than seven seconds.

The ABS lamp displays the ABS system configuration code:

앫 One blink: 6S/6M 6X2

앫 Two blinks: 4S/4M

앫 Four blinks: 6S/4M

앫 Five blinks: 6S/6M 6X4

NOTE: The ABS lamp may display eight quick flashes before the system configuration code begins.

Stored faults cleared, no active faults present. Continue with reconfiguration.

NOTE: The reconfiguration procedure cannot be conducted if there are active faults present. These must be repaired before proceeding with the reconfiguration.

WABCO Maintenance Manual MM-0112 (Revised 07-18)

8 Appendix I

3 Second

Hold

(2)

Pause

1.5 s

Pause

4 s

*ATC Lamp will light only if ATC is connected.

System ID

A system reconfiguration is illustrated below:

IGNITION ON

Light ON*

Continues until power is turned off

SWITCH

-1s

Pause

4 s

Pause

4 s

Pause

4 s

Pause

4 s

ATC Reset

Confirmation

Pause

4 s

ATC Lamp — Dyno Function (remains lit for entire test)

ATC

(2)

System ID

(2)

System ID

(2)

System ID

(2)

System ID

(2)

System ID

1003371a

-1s

-1s-1s

Action Result Reason

Observe the ABS and ATC lamps. The ATC lamp comes on and stays on. A complete ATC system — including an ATC

lamp — is installed. If not, the ATC lamp will not come on.

While the configuration code is flashing, press the blink code switch three times (one second each, with a one second pause between each).

Turn the ignition OFF.

Figure8.4

The ABS lamp will continuously blink the system configuration code.

The ABS lamp displays four quick flashes, followed by a continuous display of the system configuration code.

NOTE: The system configuration code continues until ignition is turned OFF.

ECU reconfiguring the system.

The ECU checks the following components and reprograms itself based on the new system:

앫 ATC valve

AND/OR

앫 Retarder relay

AND/OR

앫 Datalink J1939

Successfully reconfigured.

Figure 8.4

WABCO Maintenance Manual MM-0112 (Revised 07-18)

WABCO ABS, RSC, ESC, HSA Maintenance Manual

Specifications and Main Features

Frequently Asked Questions

User Manual