Bendix EC-30 ABS-ATC CONTROLLER User Manual

Bendix® EC-30™ ABS / ATC Controller

Mounting Inserts

(4 Places)

SD-13-4815

18-pin

Connector

Part Number

Label

30-pin

Connector

FIGURE 1 - EC-30™ CONTROLLER

INTRODUCTION

The Bendix® EC-30™ is an electronic ABS (antilock braking system) controller. It is the base component in a family of ABS assemblies for heavy and medium duty buses, trucks and tractors utilizing pneumatic braking systems.

The ABS function of the EC-30™ controller is designed to optimize slip on all vehicle wheels. The EC-30™ controller provides the vehicle with improved stability and steerability during braking. The EC-30™ controller will also reduce vehicle stopping distance on most surfaces.

In addition to the ABS function, the EC-30™ controller can be configured to provide an A TC (automatic traction control) feature. Bendix ATC can improve vehicle traction during acceleration on adverse road conditions. ATC can utilize engine torque limiting and/or differential braking to improve vehicle traction.

LED Diagnostic

Display

TABLE OF CONTENTS . . . . . . . . . . . . . . . . . . . . . . . PAGE

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

EC-30™ Controller Hardware Configurations . . . . . . . . 3

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EC-30

EC-30™ Controller Inputs . . . . . . . . . . . . . . . . . . . . . . . . 4

EC-30

Power-Up Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

ABS Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

ATC Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Auto-Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

EC-30™ Controller Configurable Parameters . . . . . . . . 8

EC-30

Fault Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

ABS Partial Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

EC-30™ Controller Diagnostic Display . . . . . . . . . . . . . . 9

Blink Code Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . 10

Bendix DCI Diagnostic Tool . . . . . . . . . . . . . . . . . . . . . 14

Bendix ABS Diagnostic Software . . . . . . . . . . . . . . . . . 15

NEXIQ (MPSI) Bendix Cartridge . . . . . . . . . . . . . . . . . . 15

Contacting Bendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Safe Maintenance Practices . . . . . . . . . . . . . . . . . . . . . 15

Removing the EC-30

Installing a New EC-30™ Controller . . . . . . . . . . . . . . . 16

ABS and ATC Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Controller With PLC . . . . . . . . . . . . . . . . . . . . . . 3

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Controller Outputs . . . . . . . . . . . . . . . . . . . . . . . 4

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Controller Self-Configuration . . . . . . . . . . . . . . 8

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Controller Assembly . . . . . . . . 16

ABS / ATC

Assembly

EC-30

Controller

ATC

Modulator

(integral)

ATC Modulator Connector

ATR VALVE

FIGURE 2 - EC-30™ CONTROLLER WITH ATR VALVE

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EC-30™ Controller Comparison to EC-16™ and

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EC-17

Controllers

The EC-30™ controller has been designed to replace the EC-17™ and the EC-16™ controllers as the standard Bendix ABS controller for OEM and aftermarket installations. The EC-30™ controller has a black plastic enclosure similar to the EC-17™ controller. However, the EC-30™ controller utilizes plastic mounting inserts to reduce mounting bolt corrosion, where the EC-17™ controller utilizes metal mounting inserts. The EC-16™ controller utilizes a totally metal enclosure.

The EC-30™ controller ABS warning lamp power-up sequence has been simplified compared to the EC-17™ and EC-16

™

controllers. The EC-30™ controller ABS warning lamp, at power-up without

faults, will illuminate for 2.5 seconds and then turn off. The ABS warning lamp for EC-17™ and EC-16™ controllers,

at power-up without faults, will illuminate for approximately 8 seconds and flash twice before turning off.

COMPONENTS

The EC-30™ controller ABS function utilizes the following components:

- Wheel speed sensors (4 or 6, depending on configuration)

- Electro-pneumatic ABS modulator valves (4)

- Dash mounted tractor ABS warning lamp (relay controlled)

- Service brake relay valve

- Dash mounted trailer ABS warning lamp (towing vehicles manufactured after March 1, 2001)

- Blink code activation switch (optional)

The EC-30™ controller ATC function utilizes the following additional components:

- ATC modulator - Integral to the ATR (antilock/traction relay) valve assembly

- Dash mounted ATC active/warning lamp

- Serial communication to engine control module (interfaces with throttle input and engine torque)

- ATC enable/disable switch

ENCLOSURE

The EC-30™ controller electronics are contained in a nonmetallic housing and are environmentally protected by a hard epoxy potting compound. The design of the EC-30 controller electronics is robust against radio, electromagnetic and environmental interference.

A patented LED (light emitting diode) diagnostic display and magnetic reset switch are incorporated in the housing for simple, self-contained diagnostics.

The EC-30™ controller utilizes a 30-pin and an 18-pin wire harness to interface with ABS, ATC and vehicle system components.

ECU Enclosure ABS Warning Lamp

Model Power-Up Sequence

EC-30™Plastic with Plastic 2.5 seconds on, then off

Controller Mounting Inserts

EC-17™Plastic with Metal 8 seconds on, two

Controller Mounting Inserts flashes, then off Controller flashes, then off

CHART 1 - ECU DIFFERENCES (EC-30 CONTROLLERS)

EC-16

™

Metal Enclosure 8 seconds on, two

™

, EC-17™, EC-16

MOUNTING

ECU Only

The EC-30™ controller can be bracket mounted to the vehicle cab or chassis as a stand alone ECU. See figure 1.

Valve Mounted EC-30™ Controller

The EC-30™ controller can be assembled on one of four different valve models. The controller valve assembly is then mounted in place of the standard service brake relay valve on the vehicle. An assembly model designation is assigned when the EC-30™ controller is mounted on an AR (antilock relay) valve or an ATR (antilock/traction relay) valve. See figure 2. Some models include bobtail proportioning and/or A TC functions. See chart 2.

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EC-30

Controller/Valve Added

Assembly ABS / A TR Funct ion V ehicle

Models Valve Provided Application

CR-30 AR-1™ Valve None All

CR-30BP AR-2™ Valve Bobtail Brake Tractors

AT-30 ATR-1

AT-30BP ATR-2

CHART 2 - EC-30™ CONTROLLER / VALVE ASSEMBLIES

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Valve ATC All

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V alve ATC & Bobtail Tractors

Proportioning Only

Brake Proportioning Only

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EC-30™ CONTROLLER HARDWARE CONFIGURATIONS

The EC-30™ controller ABS ECU is available in different hardware configurations in order to support various ABS, A TC and power line carrier (PLC) features. See chart 3.

EC-30™ controller premium PLC hardware can be configured for four or six sensors, with or without A TC, and PLC can be disabled.

EC-30™ controller basic models can not be configured for six sensors or ATC.

PLC hardware is needed to support PLC communication. Always verify that you are working with the correct EC-30

controller by referring to the part number label on the ECU.

EC-30™ CONTROLLER WITH PLC

Effective March 1, 2001, all towing vehicles must control an in-cab trailer ABS warning lamp. Trailers built after this date will transmit the status of the trailer ABS unit over the power line (blue wire of the J560 connector) to the tractor using PLC communications.

The PLC signal is usually broadcasted by the trailer ABS ECU. The application of PLC technology for the heavy vehicle industry is known as PLC4Trucks. The Bendix® EC-30 controller premium with PLC, and basic with PLC, will support PLC communication in accordance with SAE J2497.

Measuring / Identifying the PLC Signal

An oscilloscope can be used to verify the presence of a PLC signal on the power line. The PLC signal is an amplitude and frequency modulated signal. Depending on the filtering and load on the power line, the PLC signal amplitude can range from 5.0 mVp-p to 7.0 Vp-p. Suggested oscilloscope settings are (AC coupling, 1 volt/div, 100 µsec/div). The signal should be measured at the power leads of the

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EC-30 The EC-30

unless it is specially programmed to do so. With this standard configuration, an ABS trailer equipped with PLC or

™

a PLC diagnostic tool will need to be attached to the vehicle in order to generate a PLC signal on the power line.

™

controller. See figures 3 & 4.

™

controller will not broadcast PLC messages

Identifying an EC-30™ Controller with PLC

FIGURE 3 - POWER LINE WITHOUT PLC SIGNAL

An EC-30™ controller with or without PLC can be identified by the individual part number label on the ECU. Also, an EC-30™ controller may have one of the following labels applied:

White Label:

ECU does not support an in-cab

Trailer ABS warning lamp.

Orange Label:

ECU supports IN-CAB T railer

FIGURE 4 - POWER LINE WITH PLC SIGNAL

ABS warning lamp.

Diagnostics

Engine

Communication

EC-30 Hardware Sensors A TC J1587 J1939 Blink J1922 J1939 PLC Trailer

Configurations Codes ABS WL

Basic 4XXXX

Premium 4, 6 X X X X X

Basic PLC 4XXXXXX

Premium PLC 4, 6 X X X X X X X

EC-17/EC-16 Service 4, 6 X X X X X X

Replacement

Required for all towing vehicles built after March 1, 2001.

CHART 3 - EC-30™ CONTROLLER HARDWARE CONFIGURATIONS

EC-30™ CONTROLLER INPUTS

Power and Ground

Power is supplied to the EC-30™ controller from the ignition circuit through a 30 Amp fuse. The EC-30™ controller is grounded to the vehicle chassis. For EC-30™ controller power and ground connector pin locations, see EC-30™ controller system schematic, Figure 14.

Wheel Speed Sensors

Wheel speed data is provided to the EC-30™ controller from the Bendix® WS-20™ or WS-24™ wheel speed sensors. See figure 5 for wheel speed sensor illustrations. Working with an exciter ring, wheel speed sensors provide the EC-30 controller with an AC signal, which varies in voltage and frequency in relation to the speed of the wheel. The EC-30 controller can be configured to receive wheel speed information from 100 or 86 tooth exciter rings. Vehicle axle configurations and ATC features determine the number of speed sensors that must be used. A vehicle with a single rear drive axle (4x2, 4x4 or 6x2) requires four speed sensors for both ABS and ATC operation. A vehicle with two rear drive axles (6x4) can utilize six speed sensors for optimal ABS and ATC performance. For wheel speed sensor connector pin locations, see the EC-30™ controller system schematic, Figure 14.

Blink Code Switch

The EC-30™ controller can be configured to support an optional diagnostic blink code switch to ground, which can be used to activate several functions available through blink code diagnostics. Pin F3, of the 30-pin connector, is the blink code switch input.

Three Position Switch for ATC and Blink Codes

The EC-30™ controller can be configured to receive both the A TC enable/disable signal and the blink code activation signal from a single three-position switch. In this case, the common position of the switch is connected to pin F2 of the 30-pin

™

connector. The normally-open switch position is connected to +12 VDC to disable A TC. The normally-open (momentary)

™

switch position is connected to ground to activate blink codes. When configured in this manner, there is no wire installed in pin F3 of the 30-pin connector, which is normally used for the blink code switch input.

Brake Switch Input

The EC-30™ controller can be configured to support an optional brake switch input. The brake switch input can be used in accordance with ABS and ATC performance. Pin A2, of the 18-pin connector, is the brake switch input.

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WS-24 Sensor

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WS-20 Sensor

90° Speed

Sensors

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WS-24 Sensor

FIGURE 5 - BENDIX® WS-20™ AND WS-24™ WHEEL SPEED SENSORS

Straight Speed

Sensors

WS-20

Sensor

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ATC Enable/Disable Switch

Premium EC-30™ controller models, configured for ATC, monitor an ATC enable/disable switch to +12 VDC, which allows ATC to be manually deactivated. The ATC active/ warning lamp will be on while the ATC is disabled. Pin F2, of the 30-pin connector is the ATC enable/disable switch input.

J1939 - ATC Enable/Disable Switch

The EC-30™ controller can be configured to receive the status of the A TC enable/disable switch over the SAE J1939 serial communications link. A vehicle controller will monitor the position of the ATC enable/disable switch directly, and broadcast a J1939 message indicating its status. When configured in this manner, there will be no wire installed in pin F2 of the 30-pin ECU connector. In the event that J1939 communications is lost between the EC-30™ controller and the vehicle controller, the EC-30™ controller will disable the A TC function.

EC-30™ CONTROLLER OUTPUTS

ABS Modulators

Bendix® ABS modulators (M-21™, M-22™, M-30™ or M-32™) are controlled by the EC-30™ controller to modify driver applied air pressure to the service brakes during ABS or ATC activation. See figure 6 for illustration. The ABS modulator, an electro-pneumatic control valve, is the last valve that air passes through on its way to the brake chamber . The modulator hold and exhaust solenoids are activated to precisely modify the brake pressure during ABS. The hold solenoid is normally open and the exhaust solenoid is normally closed. The EC-30™ controller is able to control four individual modulator assemblies. For ABS modulator connector pin locations see the EC-30™ controller system schematic, figure 13.

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M-30

Supply

(Port 1)

Electrical

Connector

FIGURE 6 - M-30™, M-32™, AND M-32QR™ MODULATORS

Modulator

M-32QR

Modulator

™

Delivery

(Port 2)

Exhaust

(Port 3)

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M-32

Modulator

ATC Modulator

Premium EC-30™ controller models configured for differential braking ATC will activate the ATC modulator during ATC situations. The A TC modulator is an electrically controlled air valve integral to the ATR valve. Pins D2 and D3, of the 18-pin connector, control the A TC modulator . A connection to the ATC modulator is provided via a two-pin Deutsch connector from the A TR valve. See figure 2.

Trailer ABS Warning Lamp

EC-30™ controller models with PLC can be configured to control a trailer ABS warning lamp (located in the dash) that indicates the status of the trailer ABS unit of one or more trailers or dollies. The EC-30™ controller directly controls the trailer ABS warning lamp by providing a ground path when the lamp is to be activated. Pin E2, of the 30-pin connector, is the trailer ABS warning lamp output.

ABS Warning Lamp

The EC-30™ controller controls an ABS warning lamp to indicate the ABS unit status. The EC-30™ controller provides a ground signal to activate an ABS warning lamp relay and turn the ABS lamp off. The actual ABS warning lamp is connected to the normally-closed contacts of the relay in order to illuminate in a fail-safe manner during an ABS ECU failure. Pin E3, of the 30-pin connector, is the ABS warning lamp output.

J1939 ABS Warning Lamp

The EC-30™ controller can be configured to broadcast the ABS status over the SAE J1939 serial communications link. A vehicle dash controller directly controls the ABS warning lamp. When configured in this manner, there is no wire installed in pin E3 of the 30-pin connector. If J1939 communications is lost between the EC-30™ controller and the vehicle dash controller, the dash controller will activate the ABS warning lamp.

Retarder Disable Relay

The EC-30™ controller controls an engine or transmission retarder disable relay . The retarder activation wire is routed through the normally-closed contacts of the relay. The EC-30™ controller provides a ground path to activate the relay and interrupt power to the retarder during ABS operation. This output may also connect directly to a transmission ECU. Pin K1, of the 30-pin connector, is the ret arder disable relay output.

J1939/J1922 Retarder Disable

The EC-30™ controller can be configured to interrupt the engine or transmission retarder over the SAE J1939 serial communications link. (J1922 for some service replacement models). The retarder will be disabled during ABS via the serial communications. When configured in this manner, there is no wire installed in pin K1 of the 30-pin connector . Use of the retarder disable function via the serial link may be essential to ABS performance and is highly recommended for vehicles equipped with a capable retarder .

J1939/J1922 Torque Converter Lock Disable

The EC-30™ controller can be configured to interrupt the automatic transmission torque converter lock function, over the SAE J1939 serial communications link. (J1922 for some service replacement models). The converter lock will be disabled during ABS via the serial communications. Use of the torque converter lock disable function may be essential to ABS performance and is highly recommended for vehicles equipped with a capable transmission.

J1939/J1587 Trailer ABS W arning Lamp

The EC-30™ controller can be configured to broadcast the trailer ABS status over the SAE J1939 or the SAE J1587 serial communications links. In this case, a vehicle controller will directly operate the trailer ABS warning lamp. When configured in this manner, there is no wire installed in pin E2 of the 30-pin connector. In the event that communications is lost between the EC-30 controller, the dash controller will activate the trailer ABS warning lamp.

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controller and the vehicle

J1708/J1587 Diagnostic Link (J1939)

The EC-30™ controller provides a J1708/J1587 diagnostic link to communicate with the vehicle and various diagnostic tools. Diagnostics, system configuration, data uploading and downloading and other functions can be performed using this link. The EC-30™ controller is supported by tools such as Bendix® ABS Diagnostic Software, the Bendix® DCI hand held tool and the MPSI ProLink. The EC-30™ controller may also provide diagnostics using the SAE J1939 serial communications link.

J1939/1922 Engine Torque Reduction - ATC

The EC-30™ controller can be configured to reduce engine torque over the SAE J1939 (J1922 for some service replacement models) serial communications link. The EC-30™ controller will send a J1939 message to reduce engine torque during A TC operation.

A TC Active/Warning Lamp

Premium EC-30™ controller models configured for A TC can control an A TC active/warning lamp to indicate the st atus of the A TC system. The A TC active/warning lamp flashes when A TC is active and stays on if an ATC system fault is detected or ATC is disabled by the ATC enable/disable switch. The EC-30™ controller directly controls the ATC active/warning lamp by providing a ground path when the lamp is to be activated. Pin C2, of the 30-pin connector, is the A TC active/ warning lamp output.

J1939 A TC Active/Warning Lamp

Premium EC-30™ controller models configured for A TC can be configured to broadcast the status of the ATC active/ warning lamp over the SAE J1939 serial communications link. In this case a vehicle dash controller directly operates the ATC active/warning lamp. When configured in this manner, there is no wire installed in pin C2 of the 30-pin connector. In the event that J1939 communications are lost between the EC-30™ controller and the vehicle dash controller, the dash controller will activate the ATC active/ warning lamp.

POWER-UP SEQUENCE

ABS Warning Lamp at Power-Up

At power-up without detected faults, the ABS warning lamp turns on for 2.5 seconds and then turns off. See figure 7.

A TC Active / Warning Lamp at Power-Up

At power-up, the A TC active/warning lamp displays the A TC control configuration and then turns off. A series of blinks indicates if the ATC is configured for engine torque limiting and differential braking, engine torque limiting only, or differential braking only . See figure 7.

Powered Vehicle ABS WL

Trailer ABS WL

(PLC Detected)

Trailer ABS WL

(PLC Not Detected)

ON OFF

Diagnostic LEDs at Power-Up

At power-up, the diagnostic LEDs all turn on, then display the configuration for sensors and the ATC. After showing the configuration, only the green VLT LED will stay on. However, if a fault is detected, the faulted component will be identified by the red LEDs. See chart 4.

LED Power-Up Sequence LEDs

When power is applied All LEDs Illuminate

Then the LEDs indicate one of the following:

4 Sensors SEN-RER-FRT 6 Sensors SEN-RER-MID-FRT

Then the LEDs indicate one of the following:

ATC Engine Limiting T RC

ATC Differential Braking TRC-MOD

No A TC N/A

The LEDs will then indicate system status:

4thNormal Operation (if no faults) VLT

CHART 4 - LED POWER-UP DISPLAY OF EC-30 CONTROLLER CONFIGURATION

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Retarder Disable Relay at Power-Up

At power-up, the EC-30™ controller may toggle the retarder disable relay . If the relay is located in the cab it is usually audible to the operator.

Engine torque

limiting and

differential braking

Engine torque

limiting only

Differential braking only

No A TC

FIGURE 7 - EC-30™ CONTROLLER POWER-UP LAMP SEQUENCE

OFF

ON OFF

Trailer ABS Warning Lamp

At power-up, the trailer ABS warning lamp turns on for 2.5 seconds and then turns off. This only occurs if a PLC trailer or PLC diagnostic tool is connected to the tractor at the time ignition power is applied. Only an EC-30™ controller with PLC installed on a towing vehicle will support the trailer ABS lamp.

Modulator Chuff Test at Power-Up

At power-up, the EC-30™ controller activates a patented modulator chuff test. The modulator chuff test is an electrical and pneumatic ABS modulator test, that can assist the technician in verifying proper modulator wiring and installation. With brake pressure applied, a properly installed modulator causes a single sharp audible chuff of air pressure by activating the hold solenoid two times and the exhaust solenoid once. If the modulator is wired incorrectly, the modulator will produce a double chuff, or no chuff at all. The EC-30™ controller activates a chuff at each modulator in the following sequence:

Right-Front, Left-Front, Right-Rear , Left-Rear. See figure 8. The chuff sequence is then repeated for a total of 8 chuffs. If

an issue is detected during the modulator chuff test, look for faults and compare the modulator wiring and plumbing to the EC-30™ controller system schematic shown in figure 13.

Right Front

Left Front

Right Mid

Driver

Left Mid

Right Rear

Left Rear

FIGURE 8 - VEHICLE ORIENTATION

ABS OPERATION

Bendix ABS uses wheel speed sensors, ABS modulators and an ECU to control either four or six wheels. By monitoring the wheel slip during braking, and adjusting the brake pressure at each wheel, the EC-30™ controller is able to optimize slip between the tire and the road surface. When excessive wheel slip is detected, the EC-30™ controller will activate ABS. The EC-30™ controller controls the ABS modulators to simulate a driver pumping the brakes. However, the EC-30™ controller is able to pump each brake on the vehicle independently , and with greater speed and accuracy than a driver.

Front Axle Control

Although both steering-axle wheels are controlled by individual ABS modulators, the EC-30™ controller does not control them completely independently. The EC-30 controller uses a Modified Individual Regulation (MIR) philosophy which blends the applied braking force between the two steering axle brakes. MIR is used to minimize steering wheel pull while ABS is active on an uneven road surface (e.g. ice and asphalt).

Single Rear Axle Control

On vehicles with a single rear axle (4x2), the rear axle wheels are controlled independently . Therefore, brake application pressure at each wheel is adjusted according to the wheel behavior on the road surface.

Dual Rear Axle Control

For vehicles with dual rear axles (6x2 or 6x4), one ABS modulator controls both right wheels and the other modulator controls both left wheels. Both wheels on each side receive equal brake pressure during an ABS stop. In the case of only four wheel speed sensors, the two rear sensors are located on the lighter rear axle.

Normal Braking

During normal braking, brake pressure is delivered through the ABS modulator and into the brake actuator . If the wheel speed sensors do not detect an excessive slip, the EC-30 controller does not activate ABS control and the vehicle stop s with normal braking.

ATC OPERATION

Just as ABS improves vehicle st ability during braking, A TC improves vehicle stability and traction during vehicle acceleration. By adding an ATC modulator and/or engine communication, the EC-30™ controller ATC function uses the same wheel speed information and modulator control as the ABS function. The EC-30™ controller detects excessive drive wheel speed, compares the speed of the front, non-driven, wheels, and reacts to bring the wheel spin under control. The EC-30™ controller can be configured to use engine torque limiting and/or differential braking to control wheel spin. For optimal ATC performance, both methods are recommended.

During ATC activation, the EC-30™ controller will blink the A TC active/warning lamp to advise the driver that drive-wheel spin is occurring. When ATC is no longer active, the ATC active/warning lamp turns off.

Engine Torque Limiting ATC

The engine torque limiting feature allows the EC-30 controller to reduce engine torque to a suitable level, in relation to the amount of available traction. When the engine torque is controlled, wheel slip can be optimized, producing more traction between the wheel and road surface. Engine torque limiting is especially beneficial in avoidance of a power jackknife and when all drive wheels are on an equally slippery surface. The EC-30™ controller will verify that the driver is pressing the accelerator (using J1939 or J1922) prior to initiating an A TC event.

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In order for the engine torque limiting A TC feature to be used, the vehicle must be equipped with an electronically controlled engine and throttle. When configured for engine torque limiting ATC, the EC-30

™

controller must be connected to an electronic engine via the SAE J1939 or J1922 serial communications links.

Differential Braking ATC

Differential braking ATC allows the EC-30™ controller to gradually apply the brake on a spinning drive wheel. Since the vehicle's differential tends to drive the wheel that presents the least resistance (the wheel on the most slippery surface), a slight brake application to this wheel forces the differential to drive the wheel on the opposite side. The EC-30™ controller applies brake pressure to both rear-axle ABS modulators by energizing the ATC modulator. The EC-30™ controller can then apply pressure only to the spinning wheel by controlling the ABS modulators.

Differential braking ATC can be activated only when vehicle speed is under 25 mph and one drive wheel is spinning faster than the others.

In the event that differential braking, ATC is active for an excessive time period, the EC-30™ controller will disable

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A TC to prevent overheating and fading of brakes. The EC-30 controller will re-enable A TC af ter a short period of time. The A TC active/warning lamp will be on while the A TC is disabled.

In order for the differential braking control to be used, the vehicle must be equipped with an antilock/traction relay (A TR) valve (A TR-1 or A TR-2). The vehicle also must have an electronically controlled engine throttle.

ATC Enable/Disable Switch

The A TC enable/disable switch allows the operator to enable or disable the ATC feature as necessary. ATC can be disabled while the vehicle is stationary or in motion. However, A TC will not re-enable until the vehicle comes to a complete stop, even with the switch in the enable position. The A TC active/warning lamp will be on while the A TC is disabled.

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AUTO-CALIBRATION

Auto-calibration is a feature that allows the EC-30™ controller to compensate for tire size changes throughout the life of the vehicle. Auto-calibration is needed for proper ATC performance. The EC-30™ controller will perform an autocalibration when the tire size difference exceeds approximately 4 percent.

Tire size (rolling radius) setting information can be retrieved or adjusted by using Bendix ABS Diagnostics Software or MPSI.

If issues occur with the ATC function following a tire size change, contact Bendix or refer to your local authorized Bendix dealer.

EC-30™ CONTROLLER CONFIGURABLE PARAMETERS

The EC-30™ controller has various configurable function parameters that can be enabled to provide the user with additional or customized features. The default settings for these parameters are chosen by the vehicle OEM. The configurable features include serial communications message broadcasts, alternative lamp control, various I/O recognition, ABS control settings and others. To ensure that the unit you are working with has the correct default settings, use only the correct replacement part number. However, most of these settings can be altered using the Bendix ABS Diagnostic Software program. For further information, contact Bendix or refer to your local authorized Bendix dealer.

In order to self-configure for differential braking ATC, the A TC

™

modulator must also be connected to the EC-30

controller

and be operational. Some EC-30

™

controller part numbers will not support six wheel speed sensors or ATC. To insure that the EC-30 controller you are working with has the correct hardware capability , use only the correct replacement part number .

EC-30™ Controller Self-Configuration Procedure

Verify that all ECU, communication, sensor , ABS modulator and ATC modulator connectors are in place and then turn the ignition power on. T oggle the A TC enable/disable switch, if equipped.

Activate an EC-30™ controller self-configuration by one of the following actions:

- Hold a magnet on the reset location of the diagnostic

display for about 20 seconds (until the LEDs begin to rapidly roll), then remove the magnet.

- Press the DCI reset switch for about 20 seconds (until

the LEDs begin to rapidly roll), then release the switch.

- Use the self-configuration menu selection on Bendix ABS

Diagnostic Software or the MPSI tool.

When the self-configuration process is complete, the EC-30™ controller will automatically go through the powerup sequence and show the new configuration on the diagnostic display. If the EC-30™ controller was properly configured for ATC, the ATC active/warning lamp will also show the A TC configuration. Refer to the EC-30™ controller Power-Up Sequence section.

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EC-30™ CONTROLLER SELF-CONFIGURA TION

The self-configuration feature allows wheel speed sensor and A TC configurations to be altered when activated with a magnet or diagnostic tool. This is generally performed shortly after installing or replacing an EC-30™ controller.

Self-Configuration of Wheel Speed Sensors

The number of speed sensors connected to the EC-30 controller will be detected during the self-configuration process. The EC-30™ controller will configure for six sensors if it detects one or both Mid sensors. If only one Mid sensor is detected, the ABS warning lamp and appropriate diagnostic LEDs will illuminate following the self-configure. If no Mid sensors are detected, the EC-30™ controller will configure for four sensors.

Self-Configuration of ATC

In order to self-configure for engine torque limiting A TC, the following must be connected to the EC-30™ controller and be operational:

- J1939 or J1922 communication link to the engine

- ATC active/warning lamp

- ATC enable/disable switch (must be toggled prior to selfconfiguration)

FAULT DETECTION

The EC-30™ controller contains self-testing diagnostic circuitry that continuously checks for proper operation of the ABS/A TC components and wiring. The EC-30™ controller controls dash mounted warning lamps to advise the driver of the status of the system.

When the EC-30™ controller senses an erroneous system condition, it stores the fault code in memory, activates the

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appropriate warning lamp and disables all or part of the effected ABS or A TC functions. The faulted component is also identified on the diagnostic display on the EC-30™ controller.

In most cases, the EC-30™ controller will automatically reset (self-heal) the active fault code when the fault is corrected. However, repeated occurrences of a given fault will cause the fault code to latch. Once the fault code is latched, a manual reset is required. Latching of faults can assist in the troubleshooting of intermittent faults. The fault code is stored in the EC-30™ controller memory , even when power is removed.

After repair , latched fault codes can be reset by briefly holding a magnet on the reset location of the EC-30™ controller diagnostic display . Fault codes can also be reset with the blink code switch or with a diagnostic tool.

When a fault self-heals or is manually reset, the fault code remains in fault history. Fault history can be retrieved by using blink code diagnostics or a diagnostic tool.

ABS PARTIAL SHUTDOWN

Depending which component the fault is detected on, the ABS and ATC functions may be fully or partially disabled. Even with the ABS warning lamp on, the EC-30™ controller may still provide ABS function on wheels that are not af fected by the fault. The EC-30 soon as possible.

Front ABS Modulator Fault

ABS on the affected wheel is disabled. ABS and A TC on all other wheels remains active.

Rear ABS Modulator Fault

ATC is disabled. ABS on the affected wheel is disabled. ABS on all other wheels remains active.

Front Wheel Speed Sensor Fault

The faulted wheel is still controlled by using input from the remaining wheel speed sensor on the front axle. ABS remains active on the rear wheels. ATC is disabled.

Mid or Rear Wheel Speed Sensor Fault

ATC is disabled. In a four sensor system, ABS on the affected wheel is disabled, but ABS on all other wheels remains active.

In a six sensor system, ABS remains active by using input from the remaining rear wheel speed sensor on the same side.

ATC Modulator Fault

A TC is disabled. ABS remains active.

J1939/J1922 Communication Fault

A TC is disabled. ABS remains active.

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controller should be serviced as

Reading a Fault

When a fault is detected, the EC-30™ controller identifies the faulted component with the diagnostic LEDs. When a wheel speed sensor fault, or an ABS modulator fault is detected, the SEN or MOD LED will be accompanied by two location LEDs. An example is FR T-RHT-SEN. When these three LEDs are on, this is an indication of a fault on the front axle(FRT), right side(RHT), wheel speed sensor(SEN). For a complete explanation and troubleshooting of faults displayed by the LEDs, go to section F , Troubleshooting .

The red diagnostic LEDs only indicate active system faults. When a fault self-heals or is manually reset, the fault code remains in fault history. Fault history can be retrieved by using blink code diagnostics or a diagnostic tool.

If faults occur on multiple components, the diagnostic LEDs will display one fault at a time. When the first fault is repaired and the EC-30 displayed on the LEDs.

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controller is reset, the next fault will be

Fault Reset

After the fault is corrected, the active fault code and LEDs can be reset by briefly holding a magnet in place at the RESET location of the diagnostic display. All of the LEDs will be on while the magnet is held in place. If one or more LEDs do not go on when the magnet is in place, replace the EC-30™ controller. When the magnet is removed from the reset location, only the green VLT diagnostic LED should remain on. If red LEDs are still on, active faults are still present in the system.

Note: An EC-30™ controller self-configuration will occur if a magnet is held at the reset location for greater than 20 seconds.

ECU Fault

ABS and ATC are disabled. The system reverts to normal braking.

Voltage Fault

While voltage is out of range, ABS and ATC are disabled. The system reverts to normal braking. When the correct voltage level is restored, full ABS and ATC function is available. Operating voltage range is 9.0 to 16.0 VDC.

EC-30™ CONTROLLER DIAGNOSTIC DISPLAY

The EC-30™ controller diagnostic display consists of nine red fault LEDs, one green power LED and an internal, magnetic reset switch. See figure 9 for illustration.

No tools are needed to read the EC-30™ controller diagnostic display. A fault displayed on the LEDs will always be accompanied by the illumination of the ABS warning lamp and/or the A TC active/warning lamp.

Front Axle

Mid Axle

Rear Axle

Right Side

Left Side

ATC

Modulator

Sensor

ECU

Voltage

FIGURE 9 - EC-30™ CONTROLLER LED DIAGNOSTIC DISPLAY

Magnetic

Reset Switch

BLINK CODE DIAGNOSTICS

The EC-30™ controller provides diagnostic and configuration functions using blink code diagnostics. When the blink code mode is activated, the EC-30 warning lamp to communicate active fault codes, fault code history or, ABS and ATC configurations. The blink code diagnostics mode can also be used to reset active fault codes. See chart 5.

The ABS warning lamp illuminates while the blink code switch is pressed. The lamp turns off when the blink code switch is released. The blink code switch is optional and may not be installed on some vehicles (pin F3 of the 30-pin connector).

Following a single display of all available messages, the ABS warning lamp remains on for five seconds and then returns to the normal operating mode. Fault occurrence count information is not displayed with blink code diagnostics.

If wheel speeds are detected during the blink code diagnostics mode, the EC-30™ controller exits the blink code diagnostics and returns to the normal operating mode. The blink code diagnostics mode can only be activated following a power-up, where wheel speeds have not been detected.

Press the Blink Blink Code Action

Code Switch

1 time Display Active Fault Codes 2 times Display Fault Code History 3 times Reset Active Fault Codes 4 times Display EC-30 Configuration

CHART 5 - BLINK CODE ACTIVATION

Display Active Fault Codes

To display active fault codes, press the blink code switch one time. Following activation, there will be a three second delay, followed by a blink code display of all active fault codes. See chart 7 for fault code definitions.

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controller flashes the ABS

Display Fault Code History

To display history fault codes, press the blink code switch two times. Following activation, there will be a three second delay, followed by a blink code display of all history fault codes. See chart 7 for fault code definitions.

Reset Active Fault Codes

T o reset active fault codes, press the blink code switch three times. Following activation, there will be a three second delay , followed by a blink code message of:

1-1, (System Fully Operational - No Faults Detected) or A blink code display of all active fault codes.

The ABS warning lamp will stay on if active faults are still present. See chart 7 for fault code definitions.

Resetting active fault codes with blink code diagnostics does not clear information from the fault history. Fault history can be retrieved by using blink code diagnostics or a diagnostic tool.

Display EC-30™ Controller Configuration

T o check the ECU configuration, press the blink code switch four times. Following activation, there will be a three second delay, followed by a blink code display of the EC-30 controller configuration. See chart 6.

1st Digit Sensors

2 4 Sensors 3 6 Sensors

2nd Digit Modulators

2 4 Modulators

3rd Digit A T C

2 Not ATC 3 ATC Engine Torque Limiting Only 4 A TC Differential Brake Only 5 Full ATC (Engine Torque Limiting

and Differential Braking)

CHART 6 - BLINK CODES FOR EC-30™ CONTROLLER CONFIGURATION

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