Spicer TPCS Troubleshooting Guide

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Spicer

TPCS

(

Tire Pressure Control System

Troubleshooting Guide

AXTS0020

)

April 2007

Warnings and Cautions

General Information

The descriptions and specifications contained in this service publication are current at the time of printing.

Dana reserves the right to discontinue or modify its models and/or procedures and to change specifications at any time without notice.

IMPORTANT NOTICE

This symbol is used throughout this manual to call attention to procedures where carelessness or failure to follow specific instructions may result in personal injury and/or component damage.

Departure from the instructions, choice of tools, materials and recommended parts mentioned in this publication may jeopardize the personal safety of the service technician or vehicle operator.

Any reference to brand name in this publication is made as an example of the types of tools and materials recommended for use and should not be considered an endorsement. Equivalents may be used.

WARNING: Failure to follow indicated procedures creates a high risk of personal injury to the servicing technician.

CAUTION: Failure to follow indicated procedures may cause component damage or malfunction.

IMPORTANT: Highly recommended procedures for proper service of this unit.

Note: Additional service information not covered in the service procedures.

Always use genuine Spicer replacement parts.

Every effort has been made to ensure the accuracy of all information in this guide. However, Dana Commercial Vehicle

Systems Division makes no expressed or implied warranty or representation based on the enclosed information.

Any errors or omissions may be reported to: Marketing Services Dana Commercial Vehicle Systems Division P.O. Box 4097 Kalamazoo, MI. 49003

Tip: Helpful removal and installation procedures to aid in the service of this unit.

Table of Contents

General Information

Tire Pressure Control System 1

Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Component Description . . . . . . . . . . . . . . . . . . . . . . . . 2

Simplified System Schematic . . . . . . . . . . . . . . . . . . . . 4

Operator Instructions

Driver Display Module (DDM) . . . . . . . . . . . . . . . . . . . 5

Operator Control Panel (OCP) . . . . . . . . . . . . . . . . . . . 8

OCP Programming Chart . . . . . . . . . . . . . . . . . . . . . . 12

Diagnostics

Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Troubleshooting Tips . . . . . . . . . . . . . . . . . . . . . . . . . 16

Service Code Summary . . . . . . . . . . . . . . . . . . . . . . . 17

Service Codes

Group: 1C! (Code 17) . . . . . . . . . . . . . . . . . . . . . . . . . 19

Group: 3C! (Codes 18, 76, 77) . . . . . . . . . . . . . . . . . . 21

Group: 4C! (Code 15) . . . . . . . . . . . . . . . . . . . . . . . . . 23

Group: 5C! (Codes 33, 34) . . . . . . . . . . . . . . . . . . . . . 25

Group: 12C! (Codes 51, 52, 53, 54, 55, 56) . . . . . . . . 27

Group: 1P! (Codes 11, 12, 13, 16, 22) . . . . . . . . . . . . 29

Group: 2P! (Code 14) . . . . . . . . . . . . . . . . . . . . . . . . . 31

Group: 3P! (Code 21) . . . . . . . . . . . . . . . . . . . . . . . . . 33

Group: 4P! (Codes 23, 24, 25) . . . . . . . . . . . . . . . . . . 35

Group: 5P! (Codes 26, 27, 28) . . . . . . . . . . . . . . . . . . 37

Group: 7P! (Codes 31, 32) . . . . . . . . . . . . . . . . . . . . . 39

Group: 8P! (Code 35) . . . . . . . . . . . . . . . . . . . . . . . . . 41

Group: 9P! (Codes 36, 37, 38) . . . . . . . . . . . . . . . . . . 43

Group: 10P! (Codes 41, 42, 43) . . . . . . . . . . . . . . . . . 45

Group: 11P! (Codes 44, 45, 46) . . . . . . . . . . . . . . . . . 47

Group: 12P! (Codes 61, 62, 63, 64, 65, 66) . . . . . . . . 49

Code: No Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Service Procedures

Final System Checkout . . . . . . . . . . . . . . . . . . . . . . . .55

Pneumatic Control Unit - Cleaning and Inspection . . .57

Solenoid Assembly and Cartridge . . . . . . . . . . . . . . . .59

Service Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . .61

Joint Compounds and Fittings . . . . . . . . . . . . . . . . . . .61

Air Filter Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62

Troubleshooting Wheel End Seals . . . . . . . . . . . . . . . .63

Hose and Supply Tank Selection Chart . . . . . . . . . . . .65

Wire Harness

Connector Illustrations . . . . . . . . . . . . . . . . . . . . . . . .67

Electrical Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . .68

Configuration Connections . . . . . . . . . . . . . . . . . . . . .70

Table of Contents

Tire Pressure Control System

General Information

Spicer Tire Pressure Control System features driver control of tire air pressure through:

• Simple push button operation.

• Independent Front, Rear, and Trailer operation.

• Electronic braking priority for air system.

• Vehicle speed sensing and response capability.

• Self-diagnostics.

Key Features

Depressurized Control Lines

The only time the system is pressurized is when changing tire pressures or during pressure checks. Wheel valves isolate the tires from the rest of the system.

Electronic Braking Priority

A pressure switch, installed in the supply tank, controls the TPCS’s use of air. This optimizes and protects the brake system’s primary tank pressures during system operation.

Self-Diagnostic and Auto Shut-Down

The Spicer TPCS provides self-diagnosis during operation. If the system detects a problem, it will display a service code on the driver interface to alert the driver. If necessary, it will close the wheel valves and shut down.

Diagnostic Capability

The Spicer TPCS provides for easy troubleshooting using PCbased or industry standard tools. PC-supported diagnostics improve troubleshooting, reduce maintenance time, provide manual control of TPCS test sequences, and give historical and active service code data.

Speed / Pressure Control and Warning

If truck speed exceeds the maximum allowable speed for a given setting, a warning is activated by TPCS to alert the driver. If speed is not reduced, the system automatically inflates the tires to the appropriate pressure.

Manual Tire Inflation / Deflation

A valve stem has been included on each wheel valve and may be used for manual inflation, deflation or measurement of tire pressures.

Run Flat Operation

The TPCS normally checks tire pressures at intervals of 15 minutes. If possible tire damage is detected, the system will activate Auto RUN FLAT. RUN FLAT reduces the pressure check interval to 15 seconds, helping to assure that the tire will remain inflated despite minor tire damage.

Component Description

Tire Pressure Control System Components

Wheel Valve

General Information

Driver Display Module (DDM)

mph

kph

L/U HWY OFF HWY

bar psi

Tire Pressure Control

EMER RUN FLAT

Operator Control Panel (OCP)

SELECT

Component Description

Pressure Switch

Trailer Connector

Speed Sensor (or Alternate Speed Inputs)

Pneumatic Control Unit (shown with optional 3rd channel)

Electronic Control Unit

General Information

Wheel Valve

All axles use a Wheel Valve (WV) at each end. Dual wheels are typically connected through one WV to provide tire pressure balance, although individual wheel valves for each tire may be installed. When the system is idle, the wheel valve isolates the tire(s), ensuring fail-safe operation. A standard valve stem is included on the WV for manual inflation / deflation / pressure checking.

Electronic Control Unit (ECU)

The Electronic Control Unit (ECU) is the control center for the entire Tire Pressure Control System. The ECU receives commands from the driver through the Driver (DDM) or Operator Control Panel (OCP) and transmits and monitors appropriate signals throughout the system.

Display Module

Driver Interface

Options are available for the TPCS driver interface. The Driver Display Module (DDM) includes two rocker switches and a multi-function display. The Operator Control Panel (OCP) uses a six-button keypad and graphic display.

Vehicle Speed

Speed is read from the vehicle data link or a separate speed sensor.

Pressure Switch

The Pressure Switch (PS) acts as an electronic brake priority switch. It prevents the Tire Pressure Control System from using air from the supply tank until the brake system is fully charged. The PS also ensures that enough pressure exists for the system to operate properly.

Air Lines

The Tire Pressure Control System uses a dedicated pneumatic system plumbed from the vehicle’s existing supply tank.

Wiring

A wiring harness (Dana or OEM supplied) provides for electrical signals between appropriate components.

Pneumatic Control Unit (PCU)

The Pneumatic Control Unit (PCU) is a solenoid controlled manifold that controls the air system. It also contains the Pressure Sensor (transducer) which reads tire pressures.

Simplified System Schematic

General Information

TireTire

To Primary

and Secondary

Tanks

Wheel

Valve

Compressor

Air Dryer

Supply Tank

Wheel

Valve

Rotary

Joint

Pressure

Switch

Connector

Seal

Assembly

Trailer

User

Interface

Speed Sensor

Electronic

Control Unit

Pneumatic

Control

Unit

PCU

Sensor

Rotary

Joint

Seal

Assembly

Wheel

Valve

Simplified System

Schematic

Wheel

Valve

Wheel

Valve

System Key

Seal

Assembly

Pneumatic

Electrical

Seal

Assembly

TireTire

Wheel

Valve

TireTire

Operator Instructions

Operator Instructions - Driver Display Module (DDM)

TPCS may be equipped with one of two driver interface devices: a Driver Display Module (DDM) or an Operator Control Panel (OCP). The Driver Disp trated below and the following sec and use.

lay Module (DDM) is illus-

tion explains the features

Warning Icons

TPCS includes two distinct warnings to report possible tire problems and inappropriate vehicle operation. You must take immediate action to either reduce vehicle speed or check tire condition whenever these warnings are displayed.

Reduce Vehicle Speed

CAUTION

Failure to respond may result in overheated tires and possible tire failure.

This signal reports that the vehicle speed is too fast for the

sure selected. You must either reduce speed or select a

pres higher pressure by pressing the appropriate key. Continued operation in this mode will result in the system automatically selecting a more appropriate pressure setting.

Check Tire Condition

This signal reports that one or more tires may be at a significantly lower pressure than the others and could indicate that a

is not holding pressure. Stop the vehicle immediately in a

tire safe place and identify the extent of tire damage.

IMPORTANT

Tires can still go flat! Although the Tire Pressure Control

is designed to identify under-inflated tires and fill

System these tires to the desired operating pressure, you can still expect that tires will occasionally be punctured or otherwise damaged during normal use and no longer retain air

liably. A daily walk-around inspection of the vehicle at the

re start of the day, including a manual check of the tires, is still an important responsibility of the vehicle operator. Tire damage is more apparent after the vehicle has been idle overnight and will be more difficult to detect visually once the TPCS equipped vehicle is in operation. Although observation of excessive inflation periods through the driver

terface can help identify a tire problem, you should have

in damaged tires replaced prior to placing the vehicle in operation.

Terrain and Load Pressure Selection

Operator Instructions

Driver Display Module

CAUTION

TPCS displays both the selected terrain and load, and may be configured to display numerical tire pressures in PSI, if desired. Tire pressures for the following terrain modes can be

programmed and may be selected by the operator:

• Highw

• Off Highway (

• Em

The Emergency selection is for extreme conditions only and

ld not be used for normal driving.

shou

ay (Hy) - For travel on paved surfaces at

higher speeds.

OH) - For reduced speed operation on

secondary roads and unpaved surfaces.

ergency (E) - For selection of extremely low tire

pressures to help free a stuck vehicle.

CAUTION

System Operation

Operating a loaded vehicle at unloaded tire pressures may

sult in tire overheating and reduced tire life or blowout.

• Pressure Display - If the terrain switch

up position for >5 seconds, numerical tire pressures (in PSI) for each channel will alternate in the display with the selected mode.

Note: The system

due to heat buildup during vehicle use. This system will not automatically deflate these pressure buildups— lower pressure mode selection by the operator must be selected to initiate a deflate.

is designed to allow tire pressure increase

is held in the

• Display - The DDM uses a multi-function display to

indicate the current selections. The display will show HY for highway pressures, OH for off-highway pressures, and E for emergency pressures.

errain Selection - The terrain selection is changed

• T

by depressing the terrain rocker switch, up to increase pressures and down to decrease pressures. Any switch operation which does not change pressures will command the system to do a pressure check.

• Loa

d Selection - Vehicle load selection is repre-

sented by a horizontal bar graph under the mode display. Depress the load rocker switch to change the selection, up for increasing load and dow decreasing load.

n for

• Chann

el Indicators - The DDM indicates FRT, RR or

TLR respectively for front, rear or trailer axle groups. If a channel indicator is on continuously, that channel has achieved the target pressure.

Operator Instructions

• Service Code Indication - The DDM will not display

service codes directly but will exhibit two dashes if service is required. (Accessing the service codes will require a diagnostic tool).

Note: See the Service Codes Section to diagnose and repair.

• RUN FLAT Indicator - If the TPC System determines

that a tire or tires may not be holding air, it may reduce the pressure check interval to minimize the possibility of air loss from the tire by switching to RUN FLAT operation. (See RUN FLAT in the Key Features section).

If RUN FLAT is activated, the DDM will alternate the display of the terrain setting and RF and the CHECK TIRE indicator will be illuminated.

Tire Pressure Control System Programming

Spicer's Tire Pressure Control System is fully programmable, allowing the technician to program tire pressures for each channel (axle group) and maximum speeds for each terrain mode. If equip programming must be done with a diagnostic tool.

Programmable settings include:

• Individual pressure settings for the front, rear, and

• Loaded and unloaded axle group programming for

• Over speed warning threshold for highway,

ped with

trailer axle groups.

highway, off-highway, and emergency conditions.

off-highway and emergency conditions.

the Driver Display Module (DDM),

CHECKTIRE

Operator Instructions

Operator Instructions - Operator Control Panel (OCP)

TPCS may be equipped with one of two driver interface devices: a Driver Display Module (DDM) or an Operator Control Panel (OCP). The Operator Control Panel (OCP) is illustrated below and the following sec

tion explains the features

and use.

mph

kph

L/ U HWY OFF HWY EMER RUN FLAT

bar psi

SELECT

Warning Icons

Reduce Vehicle Speed

CAUTION

Failure to respond may result in overheated tires and possible tire failure.

Check Tire Condition

This signal reports that one or more tires may be at a significantly lower pressure than the others and could indicate that a

is not holding pressure. Stop the vehicle immediately in a

tire safe place and identify the extent of tire damage.

IMPORTANT

Tires can still go flat! Although the Tire Pressure Control

is designed to identify under-inflated tires and fill

System these tires to the desired operating pressure, you can still expect that tires will occasionally be punctured or otherwise damaged during normal use and no longer retain air

liably. A daily walk-around inspection of the vehicle at the

terface can help identify a tire problem, you should have

in damaged tires replaced prior to placing the vehicle in operation.

Operator Control Panel

This signal reports that the vehicle speed is too fast for the

sure selected. You must either reduce speed or select a

pres higher pressure by pressing the appropriate key. Continued operation in this mode will result in the system automatically selecting a more appropriate pressure setting.

mph

kph

Terrain and Load Pressure Selection

TPCS displays both the selected terrain and load, and may be configured to display numerical tire pressures in PSI, if desired. Tire pressures for the following terrain modes can be programmed and may be selected by the operator:

• HWY - For

speeds.

• OFF HWY

secondary roads and unpaved

• EM

ER - For selection of extremely low tire pressures

to help free a stuck vehicle.

The EMER key is for extreme conditions only and should not

used for normal driving.

travel on paved surfaces at higher

- For reduced speed operation on surfaces.

CAUTION

Operator Instructions

System Operation

mph

kph

L/ U HWY OFF HWY EMER RUN FLAT

• Display - The OCP uses a graphic display to indicate

the selection for both terrain mode and vehicle load. Above the selector keys labeled HWY (highway), OFF HWY (off-highway), and EMER (emergency), an illuminated arrow designates the current selection.

• T

by depressing the desired mode on the keypad. When the system is actively changing tire pressure, the arrow above the target mode will flash. Pressing the key for a current mode will command a pressure check.

• Loa

represented by an arrow above the rear w graphic display. Depress the keypad button labeled L/U to change from loaded to unlo

Operating a loaded vehicle at unloaded tire pressures may

sult in tire overheating and reduced tire life or blowout.

• Pressure Display

Select is pressed after vehicle start, numerical pressures will be displayed sequentially for each active channel. Subsequent actuation of the lock the display on individual channels, or turn it off again.

Note: The sys

due to heat buildup during vehicle use. This system will not automatically deflate these pressure buildups— lower pressure mode selection by the operator must be selected to initiate a deflate.

bar psi

SELECT

errain Selection - The terrain selection is changed

d Selection - Vehicle load selection is

heels in the

aded.

CAUTION

- If the keypad button labeled

Select key will

tem is designed to allow tire pressure increase

• Chann

inside the tires of the truck graphic. The pressure shown in the display reflects the channel with the lighted rings.

mph

kph

rvice Code Indication - The OCP will display ser-

• Se

vice codes using a number and letter combination followed by an excla

Note: See the Ser

etric/English Indicator - The OCP may be pro-

• M

grammed to display pressure in metric (BAR) or English (PSI) units

• RUN F

If RUN FLAT is activated, an asterisk (*) will be illuminated in the display of the OCP. This asterisk matches the symbol on the RUN FLA indicates that the RUN FLAT feature is selected. The OCP also allows the driver to select RUN FLAT, by depressing that key, to manually reduce the pressure check interval. This may be desirable when operating under conditions (i.e. sharp rocks or construction debris) where tire punctures may be anticipated. The RUN FLAT feature will automatically de-select after 10 minutes, but may be re-selected.

mph

kph

el Indicators - The OCP display includes rings

Tire Pressure Control

bar psi

mation point (!).

vice Codes Section to diagnose and repair.

(see Programming section).

LAT Indicator - If the TPC System determines

T key and it

bar psi

SELECT

RUN FLATL /U HWY OFF HWY EMER

mph

kph

bar psi

Operator Instructions

Tire Pressure Control System Programming

Spicer's Tire Pressure Control System is fully programmable, allowing the technician to program tire pressures for each channel (axle group) and maximum speeds for each terrain mode. The system allows programming directly through the Operator Control Panel, or with a diagnostic tool.

Programmable settings include:

• Individual pressure settings for the front, rear, and trailer axle groups.

• Loaded and unloaded axle group programming for highway, off-highway, and emergency conditions.

• Over speed warning threshold for highway, off-highway and emergency conditions.

To program the system, follow these steps:

1. Enter the Tire Pressure Control System programming sequence by pressing the SELECT and L/U buttons at the same time. A flashing bar or PSI verifies that you are in the programming mode and also indicates that the first selection, English or metric values, is ready for programming. Refer

Panel Programming Sequence" for sample

Control procedure.

2. Press the up/down arrows (on the L/U and EMER keys) to select options or change settings (pressure or speed) and press the SELECT button to record a selection in memory and move to the next step.

3. Press the SELECT button repeatedly to move through the program steps, one step for each time the SELECT button is pressed. Refer to the programming reference chart for specific Tire Pressure Control System pressure and speed programming steps.

4. To complete the programming sequence, or exit the programming mode, continue to press the SELECT button to step through to the end of the procedure, or press the SELECT and L/U buttons at the same time.

to "Operator

Operator Control Panel

Note: If no buttons are pressed for more than one minute, the

Operator Control Panel will end the programming sequence, saving any changes made during programming.

Operator Instructions

Operator Control Panel Programming Sequence

Example for Step 1 Programming (see OCP Programming Chart)

L/U

SELECT

mph

kph

bar psi

Tire Pressure Control

Press at the same

time to enter

programming

down arrow

arrow

L/U

between metric

and English

EMER

Toggle

L/U

Press at the same

time to exit

programming

SELECT

Flashing "bar" or "psi"

indicates you have

entered programming

mph

kph

bar psi

Make selection

Tire Pressure Control

SELECT

Press to record a selection in memory and move to the next step

Example for Step 7 Programming (see OCP Programming Chart)

L/U

Enter programming

SELECT

+ +

SELECT

Press SELECT six times to go to step 7

SELECT

L/U

Exit programming

SELECT

SELECT+SELECT

down arrow

SELECT

L/U

arrow

EMER

Press to set highway

unloaded drive pressure

OCP Programming Chart

Operator Instructions

Step Setting Metric

English Indicator

1 Metric / English On

2 Highway Over Speed On On

3 Highway Loaded Front Pressure On On On

4 Highway Loaded Rear Pressure On On On

5* Highway Loaded Trailer Pressure On On On

6 Highway Unloaded Front Pressure On On

7 Highway Unloaded Rear Pressure On On

8* Highway Unloaded Trailer

Pressure

9 Off-Highway Over Speed On On On On

10 Off-Highway Loaded Front

Pressure

11 Off-Highway Loaded Rear

Pressure

SpeedIndicator

Terrain Arrows Loaded

Arrow

HWY OFF HWY EMER Front Rear Trailer

On On

On On On

On On

OCP Channel Indicator

OCP Programming Chart

12* Off-Highway Loaded Trailer

Pressure

13 Off-Highway Unloaded Front

Pressure

14 Off-Highway Unloaded Rear

Pressure

15* Off-Highway Unloaded Trailer

Pressure

16 Emergency Over Speed On On

17 Emergency Loaded Front Pressure On On On

18 Emergency Loaded Rear Pressure On On On

19* Emergency Loaded Trailer

Pressure

20 Emergency Unloaded Front

Pressure

21 Emergency Unloaded Rear

Pressure

22* Emergency Unloaded Trailer

Pressure

On On

On On On

On On

* 3 Channel Only

Diagnostics

This section covers the equipment and procedures used to find and correct Tire Pressure Control System problems.

Test Equipment

Tire Pressure Control System troubleshooting can be performed at three levels:

1. PC diagnostics.

2. Handheld tester.

3. Operator Control Panel service codes (if vehicle is equipped with an OCP).

Regardless of the testing equipment used, the troubleshooting procedures will be based upon the diagnostic service codes. Diagnostic tools offer the advantages of computeraided testing without interpreting service codes.

Tire Pressure Control System Diagnostics

The onboard system diagnostics are an important feature of Spicer’s Tire Pressure Control System. This section describes the use of service codes to identify Tire Pressure Control System operating problems.

Service Codes

The Service Codes are described in the Troubleshooting section. Some service codes also identify the component that is associated with the problem. A list of possible causes is shown in order of most likely occurrence.

Test Modes

Diagnostic tools allow the system to be placed in several diagnostic modes:

Info - Display ECU information and configuration.

Codes - Active and historic codes are listed as reported by the

ECU.

Monitor (Normal) - TPCS operates normally, while status of system components is observed.

Test - The following operations can be performed on each channel (axle group):

• Check & Hold - System checks and

displays the pressures, then holds pressure in air lines (quick test of control line and seal integrity).

The Tire Pressure Control System uses a code to identify service issues. The codes can be extracted from the ECU memory using a diagnostic service tool appropriate Operator Control Panel (OCP) will report codes directly on the display. Refer to the service code chart for more detailed information on service codes.

software. In addition, systems equipped with an

equipped with the

Historical Service Codes

Any time a fault occurs the system will log a fault in memory of the ECU. If the system becomes inoperative, the Driver Display Module (DDM) will report two dashes (- -) or an actual service code will be displayed on the Operator Control Panel. (Only the most recent code is displayed by the Operator Control Panel). Historical codes are stored in memory. Historical codes can only be accessed by a diagnostic tool. Historical codes are automatically cleared after 50 ECU resets with no active faults.

• Deflate - System "manually" deflates (test the

deflation signal).

• Inflate - System "manually" inflates (test for large

leaks).

• Hold - Pressure is held in control lines (test for small

leaks).

Setup - Allows the technician to modify parameters such as target tire pressures, etc.

Diagnostics

PC Diagnostics

CAUTION

A battery charger is not an adequate source of power.

Visit www.dana.com for free download of Dana Diagnostic Tool (DDT).

PC diagnostics are easy to use and provide the quickest diagnostic capabilities.

• Retrieve historical data, faults and tire pressures.

• Pressurize system to detect leaks.

• Access troubleshooting flowcharts and service

procedures.

Attach computer to RP1210A communications box.

Download free Dana Diagnostic Tool from dana.com.

To use this program, an RP1210A compatible interface box and cables are needed to connect the PC to the vehicle.

For these types of interface boxes to work with the Dana Diagnostic Tool program, you must install a "RP1210 driver" program provided by the manufacturer of the interface box. If you do not have this program, it can normally be obtained from the manufacturer's web site. Please contact the manufacturer of your interface box if you have any questions regarding this process.

Connect to diagnostic connector.

Diagnostics

Note: Program requires

Windows 98 or newer.

Follow on-screen instructions.

Diagnostics

Handheld Tester

A Prolink handheld tester may be used to read and clear service codes and to obtain a short description of failures. The tester can initiate test sequences for controller outputs and can also read system parameters when equipped with the Dana program card.

KENT-MOORE

MICRO PROCESSOR SYSTEMS INC.

Pro-Link

7 8

4 5

2 3

ENTER

FUNC

Multimeter

Based upon system schematics and aided by component specific service codes, a multimeter can be used to check sensor and solenoid resistances and to find wiring harness faults. The multimeter can be used to check the Tire Pressure Control System wiring and components for:

• Continuity

• Ground

• Broken wires

• Open circuits

• Shorted circuits

• Incorrect battery voltage

Troubleshooting Tips

Diagnostics

This checklist outlines some general hints and guidelines that will be helpful in tracking down and correcting operating problems.

Operator Control Panel only displays one active code.

Only the most recent service code Control Panel. In troubleshooting, be alert for related codes. Use of a diagnostic tool offers the advantages of spotting multiple active codes as well as retrieving historical codes.

A cleared code alone does not indicate a corrected problem.

A code is set by a specific fault condition and may be cleared

switching the ignition off. It's possible to clear a code (i.e.,

by remove it from the driver interface) only to have it display again when the fault condition reoccurs. To ensure that a problem is fixed, you must run the system through the same operating modes that caused the problem and verify that the service code does not appear.

Disconnect the Electronic Control Unit connector with ignition off.

To avoid setting electrical service codes, make sure that the ignition is at the Electronic Control Unit module.

Reconnect the connector before switching on the ignition.

off before unplugging the wire harness connection

displays on the Operator

C! Service Codes are often connection problems.

The most likely cause of component faults will be damaged wires or co service codes, switch off vehicle ignition, then disconnect applicable connectors and inspect for damage. (Switching off the ignition is required before disconnecting the harness at the Electronic Control Unit, but is also a recommended practice before all other electrical system disconnections.) Clean or repair all

System is not continually pressurized.

When troubleshooting P! service code faults, keep in mind that ple, in the inflate mode). This means that such checking for leaks require the system to be in an active, pressurized state. This can be accomplished most easily by using

Basic vehicle air and power systems guide.

The Tire Pressure Control System requires air pressure and electrical power Diagnosis and service of these systems is outside the scope

this manual.

Some faults will halt inflate or deflate sequences.

Upon sensing some service codes, the Tire Pressure Control System will immediately go cause mode arrows to stop flashing before the system has

actually attained the pressures for the indicated mode.

nnections. As a first step in troubleshooting all C!

suspicious connections before proceeding.

the air system is only pressurized as needed (for exam-

procedures as

a diagnostic tool.

are not covered in this

supply from the base vehicle systems.

to the "maintain" mode. This may

Troubleshooting Tips

Diagnostics

Service Code Summary

Group Code System Status Description

1C! 17 No Operation Power - battery voltage out of range at the ECU

3C! 18 Normal Operation Speed Signal - no speed detected during multiple ignition cycles

76 Normal Operation J1587 Speed Message - not

77 Normal Operation J1939 Speed Message - not

4C! 15 Inflate Only Display Control Communications - ECU not receiving

interface

5C! 33 No Operation PCU Sensor - signal voltage too high

34 No Operation PCU Sensor - connector unplugged; signal voltage too low

12C! 51 No Operation PCU Solenoid, Front - connector unplugged; faulty wiring or solenoid

52 No Operation PCU Solenoid, Rear - connector unplugged; faulty wiring or solenoid

53 No Operation PCU Solenoid, Trailer - connector unplugged; faulty wiring or solenoid

54 No Operation PCU Supply Solenoid - connector unplugged; faulty wiring or solenoid

55 No Operation PCU Deflate Solenoid - connector unplugged; faulty wiring or solenoid

56 No Operation PCU Control Solenoid - connector unplugged; faulty wiring or solenoid

1P! 11 No Deflation Deflate Signal, Front - could not generate a

12 No Deflation Deflate Signal, Rear - could not generate a vacuum in control lines

13 No Deflation Deflate Signal, Trailer - could not generate a vacuum in control lines

16 Normal Operation Deflate Signal - could not generate a vacuum in one or

22 Inflate Only Deflate Signal, PCU - could not generate

receiving expected messages on J1708 data link

receiving expected messages on data link

communications from user

vacuum in control lines

more channel's control lines

a vacuum in pneumatic control unit

2P! 14 Inflate Only Deflate Trend - tire pressure did not decrease properly

3P! 21 Inflate Only Vacuum - unintentional vacuum in PCU

4P! 23 Pressure Check Only Between Modes, Front - inflated or

24 Pressure Check Only Between Modes, Rear - inflated or deflated too slowly

25 Pressure Check Only Between Modes, Trailer - inflated or deflated too slowly

5P! 26 Pressure Check Only Low Pressure, Front - open line or large seal leak

27 Pressure Check Only Low Pressure, Rear - open line or large seal leak

28 Pressure Check Only Low Pressure, Trailer - open line or large seal leak

7P! 31 Pressure Check Only Pressure Switch - failed closed or wiring shorted

32 Pressure Check Only Low Air Supply - pressure switch did not close

8P! 35 Pressure Check Only Atmospheric - PCU sensor reading out of range

9P! 36 Channel Inoperative Inflate Trend, Front - tire pressure decreased

37 Channel Inoperative Inflate Trend, Rear - tire pressure

38 Channel Inoperative Inflate Trend, Trailer - tire pressure decrea

deflated too slowly

during an inflate

decreased during an inflate

sed during an inflate

during deflate

Diagnostics

Group Code System Status Description

10P! 41 Inflate Only Tire Leak, Front - not passing tire pressure confirm check (multiple attempts)

42 Inflate Only Tire Leak, Rear - not passing tire pressure confirm c

43 Inflate Only Tire Leak, Trailer - not passing tire pressure confirm check (multiple attempts)

11P! 44 Pressure Check Only Tire Leak, Front - tire pressure imbalance or line leak

45 Pressure Check Only Tire Leak, Rear - tire pressure imbalance or line leak

46 Pressure Check Only Tire Leak, Trailer - tire pressure imbalance or line leak

12P! 61 Normal Operation Sluggish Shut Off, Front - lost minor pressure during wheel valve

62 Normal Operation Sluggish Shut Off, Rear - lost

63 Normal Operation Sluggish Shut Off, Trailer - lost minor pressure

64 Normal Operation Shut Off Failure, Front - cannot close wheel valve(s) and vent lines

65 Normal Operation Shut Off Failure, Rear - cannot close wheel valve(s) and vent lines

66 Normal Operation Shut Off Failure, Trailer - cannot

- 47-48 Reserved (47, 48)

57 Spare #1 - connector unplugged; faulty wiring or component

58 Spare #2 - connector unplugged; faulty wiring or component

67-68 Reserved (67, 68)

71-75 Reserved (71-75)

78 Reserved (78)

minor pressure during wheel valve shut off

close wheel valve(s) and vent lines

heck (multiple attempts)

during wheel valve shut off

shut off

Service Code Summary

Service Codes

Group: 1C! (Code 17)

Type: Power

System Mode Condition Possible Causes

(Listed in Likely Order of Occurrence)

No Operation Power out of range - Low battery voltage.

- Poor ground connection to Electronic Control Unit.

- Poor switched ignition connection to Electronic Control Unit.

- High vehicle electrical system voltage.

- Faulty Electronic Control Unit.

Code Description

Group 1C! (17) indicates a power fault and sets when the system power is outside the acceptable range of 9 to 32 volts.

fault could be caused by low battery power or some other

The problem with the basic vehicle electrical system.

If the vehicle power system checks out possible causes include bad Electronic Control Unit (ECU) connections, or a faulty Electronic Control Unit.

In inspecting circuits and connections for a Code 1C! fault, pay part be causing the fault.

See "Troubleshooting Tips" for general diagnostics.

icular attention to a bad ground connection that could

satisfactorily, other

guidelines on system

ECU Harness Connector

ABB

GHJK

HJJKK

3 2 1

Power (Code 17)

Service Codes

Group: 1C! (Code 17)

With ignition switched on and engine running,

measure battery voltage across battery terminals.

Is voltage

reading > 32

volts?

With ignition switched on but engine not running,

measure battery voltage across battery terminals.

Is voltage

reading

< 9 volts?

Switch off ignition. Disconnect ECU connector. Switch on ignition. Check SWACC circuit by measuring voltage between ECU harness connector pins K1 and K2.

Yes

Base vehicle power is out of range.

Refer to Service Manual

Base vehicle power is out of range.

Refer to Service Manual

Does

measured

voltage match battery voltage

reading obtained in

step?

Yes

Is code 1C!

fault cleared?

Yes

Complete

Inspect for failure in SWACC circuit including

vehicle power panel and/or ground

connections. Repair or replace as indicated.

Inspect wire sockets and ECU pins.

If okay, replace ECU.

Service Codes

Group: 3C! (Codes 18, 76, 77)

Type: Speed Signal

System Mode Condition Possible Causes

(Listed in Likely Order of Occurrence)

Normal Operation No speed signal - ECU power cycled 50 times without vehicle being moved.

- Sensor disconnected or loose plug.

- Either speed sensor wire is open (broken wire).

- Either speed sensor wire is shorted to ground (bare wire is touching the frame).

- Faulty speed sensor.

- Sensor actuation failure.

- Tang drive broken/disconnected on

- Gap not adjusted correctly on pole sensor.

- Sensor wires shorted together.

mechanical sensor.

Code Description

Group 3C! indicates a faulty speed sensor signal. In general, the system is configured to accept speed signals from any one of several sources (analog or digital; J1708/J1587, J1939). In this standard configuration, a loss of speed signal fault is indicated by code 18. In some specific instances, a vehicle may be configured to only accept speed from a specific data link. In these cases, codes 76 (SAE J1708/J1587) and code signal fault.

Note: These codes will occur

See "Troubleshooting Tips" for general diagnostics.

77 (SAE J1939) may be used to indicate a speed

• A wiring or sensor connection.

• A misadjusted or faulty sensor.

• A missing data link speed signal. (J1939 or J1708/ J158

if ECU power has been cycled 50 times and no speed signal is received. Fifty power cycles can occur after 25 engine starts without moving the vehicle, however the code will clear as soon as a speed signal is received.

guidelines on system

Speed Sensor

Harness Connector

ECU Harness Connector

ABB

GHJK

HJJKK

3 2 1

)

Speed Signal (Codes 18, 76, 77)

This fault is set when ECU power has been cycled 50 times without sensing any speed input. Move vehicle at greater than 5 mph.

Service Codes

Determine type of speed sensor input:

Check adjustment on threaded

pencil speed sensor or drive tang on

mechanical speed sensor.

Sensor problem?

Switch off ignition. Disconnect speed sensor and ECU from harness. Check for shorts on ECU connector:

- F2 to F3

- F2 to K2

- F3 to K2

Yes

Did fault clear?

Digital (TTL signal from engine ECU or speedometer) Analog (pole sensor or VR type) Data Link (SAE J1708/1587 or SAE J1939)

Analog

Repair as necessary.

Sensor type?

Digital

Yes

Data Link

Complete

Group: 3C! (Codes 18, 76,

Use industry standard tools to verify

data link signal is OK.

Switch off ignition. Disconnect speed input from signal source and ECU from harness. Check for shorts on ECU connector F1 to K2.

Check continuity of ECU

connector F1 to speed input.

Was a short found?

Check for opens:

Short speed sensor harness connector A and B together. Measure continuity between F2 and F3 on ECU connector.

Was circuit open?

Replace speed sensor.

Yes

Repair harness

as necessary.

Repair harness

as necessary.

Note: ECUs are not a typical cause of problems. If an ECU is replace, the system should be carefully rechecked to make sure the problem has been fixed and does not reoccur.

Repair and verify speed signal source.

Move vehicle at

greater than 5 mph.

Did active

code clear?

Replace ECU.

Yes

Complete

Service Codes

Group: 4C! (Code 15)

Type: Display Control Communications

System Mode Condition Possible Causes

(Listed in Likely Order of Occurrence)

Inflate Only Blank Display - No power to Driver Interface.

- No ground connection to Driver Interface.

- System voltage out of range

(9-19 volts DC).

Inflate Only Operator Control Panel

displays logo only

DDM displays dash dash (nothing else on display)

- No power or ground to ECU.

- Driver Interface to Electronic

- Driver Interface to Electronic Con

- Faulty Driver Display Module/Operat

- Faulty Electronic Control Unit.

Code Description

Group 4C! indicates a communication problem between the Electronic Control Unit (ECU) and the driver interface (either the Driver Display Module or Operator Control Panel). Code 4C! will only be observable on a diagnostic tool as code 15. It will not show on the Operator Control Panel. Instead, the Operator Control Panel may be blank (indicating a power problem).

All of the troubleshooting steps for the condition of Electronic Control Unit and driver interface circuits. If no circuit problems are found, Code 4C! indicates either a faulty driver interface or a faulty Electronic Control Unit.

code 4C! involve checking

Control Unit lines open.

trol Unit lines shorted to ground. trol Unit lines shorted to power. trol Unit lines shorted together.

or Control Panel.

DDM Display Harness Connecto

See "Troubleshooting Tips" for general diagnostics.

ECU Harness Connector

ABB

guidelines on system

GHJK

HJJKK

OCP Harness Connector

3 2 1

Display Control Communications (Code 15)

Turn on ignition.

Service Codes

With vehicle running, measure battery

voltage across battery terminals.

Is voltage

reading > 19

volts?

With ignition switched on but engine

not running, measure battery

voltage across battery terminals.

Is voltage

reading < 9

volts?

Disconnect driver interface. With ignition on, measure voltage between:

DDM Display or OCP Harness Pins Harness Pins

4 and 5 5 and 6

Does

measured

voltage match

battery voltage reading

obtained

in previous

step?

Yes

Replace driver interface.

Yes

Base vehicle power is out of range.

Yes

Refer to Service Manual

Base vehicle power is out of range.

Refer to Service Manual

Repair harness power or ground

connections to driver interface.

Note: ECUs are not a typical cause of

problems. If an ECU is replaced, the

system should be carefully rechecked

to make sure the problem has been

fixed and does not reoccur.

driver interface

completely

blank?

Replace ECU.

Check continuity between:

ECU and DDM Display or OCP Harness Pin Harness Pin Harness Pin

K3 6 9 J3 7 10

Check for communication circuits shorted to ground, power or shorted to each other. Check between:

DDM Display Harness Pins or OCP Harness Pins

6 and 4 9 and 6 7 and 4 10 and 6 7 and 5 9 and 5 6 and 5 10 and 5 6 and 7 9 and 10

Switch ignition off. Disconnect ECU connector. Disconnect driver interface connector.

Switch ignition on. Verify adequate voltage (9-32 Vdc) between power (ECU harness connector pin K1) and ground (ECU harness connector pin K2).

Is voltage within range?

Yes

Is there

continuity?

Yes

Is any circuit shorted?

Replace driver interface. Switch on ignition.

Is driver

interface functioning

correctly?

Inspect fuses/ repair harness

to power ECU.

Inspect and repair

faulty

communications

circuit in harness.

Yes

Inspect and

repair faulty

wire or

connection.

Complete

Group: 4C! (Code 15)

Service Codes

Group: 5C! (Codes 33, 34)

Type: PCU Sensor

System Mode Condition Possible Causes

(Listed in Likely Order of Occurrence)

No operation No PCU sensor reading - PCU Sensor electrically disconnected.

- PCU Sensor signal wire open.

- PCU Sensor signal wire shorted to ground.

- PCU Sensor XDCR VREF wire open.

- PCU Sensor XDCR VREF wire shorted to ground.

- PCU Sensor XDCR COMMON wire open.

- Faulty PCU Sensor.

- Faulty Electronic Control Unit.

No operation High pressure transducer

reading

- PCU Sensor signal wire shorted to VBATT or XDCR VREF.

- Faulty PCU Sensor.

- Faulty Electronic Control Unit.

Code Description

Group 5C! displays when the Electronic Control Unit (ECU) receives an unusually high or low reading from the PCU Sensor. A diagnostic tool will specify 33 for a high reading and 34 for a

Initial troubleshooting steps involve checking shorted-to-ground or an open PCU Sensor circuit.

If the circuits check out OK, secondary causes could involve a faulty transducer

See "Troubleshooting Tips" for general diagnostics.

low reading.

for a

or a faulty Electronic Control Unit.

guidelines on system

PCU Sensor

Harness Connector

ABC

ECU

Harness Connector

ABB

G H JK

HJJKK

3 2 1

PCU Sensor (Codes 33, 34)

With ignition off, inspect socket connections at

ECU connector and at PCU sensor 3-way.

Service Codes

Group: 5C! (Codes 33, 34)

Replace ECU.

Repair

conditions as

necessary.

Inspect and repair faulty

harness.

Are

PCU Sensor ECU Harness Harness Pin Connector Pin

connections

mechanically and

electrically

sound?

Yes

Disconnect the ECU connector

and the PCU sensor connector.

Check continuity between the

following points:

C H1 B H2 A H3

Is there

continuity?

Yes

Is voltage

between 4.9 and

5.1V?

Yes

Check harness inside PCU

cover for continuity:

A to A B to B C to C

Is there

continuity?

Yes

Check harness inside PCU cover for shorts:

A to B B to C C to A

Are any

shorted?

Yes

Note: ECUs are not a typical cause of

problems. If an ECU is replaced, the

system should be carefully rechecked

to make sure the problem has been

fixed and does not reoccur.

Repair mini-harness inside cover.

Inspect and

repair faulty

harness.

Check for short circuits between each

pair of PCU sensor harness pins:

A and B B and C C and A

Check voltage between PCU sensor harness

pin B and ground with ignition switch on.

Are any

shorted?

Yes

Reconnect ECU connector.

Replace PCU sensor.

Is the active

fault cleared?

Yes

Complete

Replace ECU.

Note: ECUs are not a typical cause of

problems. If an ECU is replaced, the

system should be carefully rechecked

to make sure the problem has been

fixed and does not reoccur.

Service Codes

Group: 12C! (Codes 51, 52, 53, 54, 55, 56)

Type: PCU Solenoids

• Front (51)

• Rear (52)

• Trailer (53)

• Supply (54)

•Deflate (55)

• Control (56)

System Mode Condition Possible Causes

(Listed in Likely Order of Occurrence)

No operation Pneumatic Control Unit

solenoid failed electrical diagnostic test

- Connector unplugged or faulty wiring.

- Solenoid wire open.

- Solenoid wire shorted to ground.

- Solenoid wire shorted to power.

- Faulty solenoid.

- Faulty Electronic Control Unit.

Code Description

Group 12C! indicates an electrical fault in the Pneumatic Control Unit (PCU). Codes 51 through 56 specifically designate which solenoid in the PCU operation is disabled when this fault is detected.

is faulty. System

PCU Connector

EFDGCHBA

The system shuts down in a fail-safe mode

and turns off

power to the solenoids.

The troubleshooting tree first tests internal solenoid circuitry.

istance outside the specified range of 7 to 25 ohms

Res indicates a defective solenoid. Successive steps check continuity of the wire harness circuits between the Pneumatic

ntrol Unit and the Electronic Control Unit (ECU). If the

Co problem can be traced to a faulty circuit or connector, make the necessary repairs. If the troubleshooting routine leads to a problem with the solenoid itself, the Pneumatic Control Unit must be repaired or replaced. If both the solenoid and the circuitry check out, the Electronic Control Unit is faulty.

See "Troubleshooting Tips" for general

guidelines on system

diagnostics.

PCU Harness

Connector

ABCDE

KHGF

ECU

Harness Connector

A B

ABB

GHJK

HJJKK

3 2 1

Service Codes

)

PCU Solenoids (Codes 51, 52, 53, 54, 55, 56)

Code 12C! Indicates one or more solenoid faults. Use service tool to determine the specific solenoid. When the troubleshooting instructions refer to connector test points, use chart select the pin test point for use with the particular fault code you are diagnosing.

Solenoid/

Code

PCU Harness

Connector

ECU Harness

Connector

Any

Code

Any

Front

Code

H F G E K A C B D

K2 K2 D1 D2 E1 K2 B1 B2 B3

(51)

Rear

(52)

Trailer

(53)

Supply

(54)

Deflate

(55)

Control

(56)

Are any pins

shorted to

ground?

Yes

Repair or replace

connections,

coils or PCU.

Group: 12C! (Codes 51,

52 53

Switch off ignition. Disconnect harness at PCU 10-way connector.

Measure solenoid coil resistance on PCU 10-way connector.

Front (51): F – G Supply (54): H – C Rear (52): F – E Deflate (55): H – B Trailer (53): A – K Control (56): F – D

Are all

resistance

measurements

7-25 ohms?

Yes

Repair or replace

connections, coils or PCU.

Disconnect ECU harness connectors. Check continuity of harness pins shown in chart for given fault code: PCU harness connector to ECU harness connector.

Are circuits

continuous?

Yes

Measure at PCU harness connector.

Verify continuity between:

-A and F

-A and H. Verify no continuity between any combination of pins B, C, D, E, G, K on PCU harness connector and K2 on ECU harness connector. (Do not use multi-meter’s continuity “beep mode,” as most meters will falsely identify the 7-25 ohm coils as shorted.)

Repair or replace

harness.

Check for shorts between PCU connector

pins B, C, D, G, E, K and vehicle ground. (Do not use multi-meter’s continuity “beep mode,” as most meters will falsely identify

the 7-25 ohm coils as shorted.)

Note: ECUs are not a typical cause of problems. If an

ECU is replaced, the system should be carefully

rechecked to make sure the problem has been fixed

Are

connections

OK?

Yes

Replace ECU.

and does not reoccur.

Repair or replace

harness.

Group: 1P! (Codes 11, 12, 13, 16, 22)

Service Codes

Type: No Deflate Signal

System Mode Condition Possible Causes

(Listed in Likely Order of Occurrence)

Inflate Only Inadequate vacuum in the

Pneumatic Control Unit

Inflate Only No sustained vacuum in

trol lines

con

- Plugged or restricted Pneumatic Control Unit vent line.

- Faulty Pneumatic Control Unit.

- Line leaks.

- Air seals, oil lip seals.

Code Description

Group 1P! indicates inadequate vacuum in the Pneumatic Control Unit (PCU) prior to channel selection, or failure to sustain a vacuum in the control lines following channel selection. These codes will be set when the nominal vacuum

" Hg drops to 17" Hg. Codes can be generated by one

of 26 channel, multiple channels or a combination of channels.

When a deflate is requested, the system channel control lines and generates a vacuum in the Pneumatic Control Unit alone. A failure to generate thi will result in Diagnostic Code 22.

first shuts off all the

s vacuum

Group1P! can be caused by:

• Line leak.

• Air seal or oil lip seal leaks.

• Plugged or restricted Pneumatic Control Unit vent

• Faulty Pneumatic Control Unit.

To identify the root cause of the problem, connect the diagnostic tool (see Diagnostic Se and descriptions) and follow the procedure in the 1P! Troubleshooting Tree.

line.

ction for test equipment

Once the vacuum has been established in the Pneumatic Control Unit, the individual channel control line(s) and a vacuum is routed to them. If a vacuum is not sustained in the control lines, a 1P! fault is logged as follows:

11 - Front Channel

12 - Rear Channel

13 - Trailer Channel

16 - Individual channels OK but a combination of channels results in low vacuum.

Note: If a

vacuum loss occurs during an attempt to deflate two or more channels at the same time, the system will halt the deflate and re-attempt it one channel at a time. This will result in a Code 16 being stored in the ECU.

are opened

See "Troubleshooting Tips" for general guidelines diagnostics.

on system

)

No Deflate Signal (Codes 11, 12, 13, 16, 22)

Using the diagnostic tool, test

vacuum in isolated PCU.

Service Codes

Initiate pressure check and hold on steer channel. Check all air lines and fittings for leaks as well as exhaust port of wheel valves. Make repairs to faulty components.

Initiate pressure check and hold on drive channel. Check all air lines and fittings for leaks as well as exhaust port of wheel valves. Make repairs to faulty components.

Is the vacuum

< 6" Hg?

Yes

Initiate deflate mode on the steer

channel. Record the reading.

Is the vacuum

> 20" Hg?

Yes

Initiate deflate mode on the drive

channel. Record the reading.

Is the vacuum

> 20" Hg?

Yes

vent line plugged or

Repair PCU restriction and

recheck system.

Refer to Service Manual

Is the PCU

restricted?

Yes

Replace PCU and recheck

Refer to Service Manual

Problem is a cumulative effect

of individual channel leaks.

system.

Group: 1P! (Codes 11, 12,

13 16

Initiate deflate mode on the trailer

Initiate pressure check and hold on trailer channel. Check all air lines and fittings for leaks as well as exhaust port of wheel valves. Make repairs to faulty components.

channel. Record the reading.

Is the vacuum

> 20" Hg?

Yes

Initiate inflate pressure hold on channel with the lowest vacuum reading. Check for leaks. Make repairs to faulty components.

Verify by initiating deflate

mode on repaired channels.

Note: Line leakages occasionally occur which are unidirectional; i.e., they might occur under vacuum and not pressure (or vice-versa). Inability to determine the cause of vacuum loss on an individual channel may dictate replacement of air lines and/or fittings on that channel. Be sure all replaced air lines and fittings are identical in all respects, including length, to the parts replaced.

Group: 2P! (Code 14)

Service Codes

Type: Deflate Trend

System Mode Condition Possible Causes

(Listed in Likely Order of Occurrence)

Inflate Only Pressure increased or failed

to drop appropriately

- Plugged or restricted control lines.

- Plugged or restricted Pneumatic Unit vent line.

- Plugged or restricted wheel valve exhaust port.

- Faulty Pneumatic Control Unit.

Code Description

Group 2P! is the result of a deflate that did not occur properly. The system measures tire pressure before and after each deflate. If the pressure readings indicate that the pressure either increased or failed to drop properly, the system shuts down the deflate sequence.

Group 2P! can be caused by:

• Plugged or restricted control lines.

• Plugged or restricted Pneumatic line.

Control Unit vent

• Contaminated or faulty Pneumatic Control Unit.

To identify the root cause of the problem, connect the diagnostic tool (see Diagnostics Section for and descriptions) and follow the procedure in the 2P! Troubleshooting Tree.

See "Troubleshooting Tips" for general diagnostics.

test equipment

guidelines on system

Deflate Trend (Code 14)

Use diagnostic tool to manually

deflate the tires on each channel.

Caution: Verify clean (no oil), dry air system on vehicle. This condition can be caused by contamination in PCU. Reference PCU Cleaning and Inspection for cleaning procedure.

All tires on each

channel deflate?

Yes

Replace or clean PCU.

Service Codes

Check for conditions preventing vacuum reaching tires:

Group: 2P! (Code 14)

Restrictions in valve stems (valve cores, filters, rubber, etc.) Restricted PCU vent line Loss of vacuum on channel (see 1P! flowchart) Inoperative or restricted wheel valve

Verify repair by monitoring

system deflate.

Group: 3P! (Code 21)

Service Codes

Type: Vacuum Fault

System Mode Condition Possible Causes

(Listed in Likely Order of Occurrence)

Inflate Only Inappropriate vacuum

generation

- Faulty or contaminated Pneumatic Control Unit.

Code Description

Group 3P! displays when the system is generating a vacuum at a time when the Electronic Control Unit (ECU) is not requesting is highly unlikely.

The most likely cause of an unexpected vacuum is a contaminated or faulty Pneumatic Verify the problem before replacing the Pneumati Unit. See the procedure in the 3P! Troubleshooting Tree.

See "Troubleshooting Tips" for general diagnostics.

a vacuum. Creation of an unexpected vacuum

Control Unit (PCU).

c Control

guidelines on system

Vacuum Fault (Code 21)

Service Codes

Verify the problem.

Replace or clean PCU.

Caution: Verify clean (no oil), dry air system on vehicle. This condition can be caused by contamination in PCU. Reference PCU Cleaning and Inspection for cleaning procedure.

Verify the repair.

Group: 3P! (Code 21)

Group: 4P! (Codes 23, 24, 25)

Service Codes

Type: Channel Between Modes

System Mode Condition Possible Causes

(Listed in Likely Order of Occurrence)

Pressure Check Only Slow Inflate - Faulty compressor.

- Restricted flow at wheel valve air filters

- Crimped or plugged lines.

Slow Deflate - Restricted flow at wheel valve air filters

- Plugged or restricted Pneumatic Control Unit vent port.

- Leaking lines.

- Plugged or restricted wheel valve exhaust port.

Code Description

Group 4P! displays if any channel inflates or deflates too slowly as shown below:

• 23 - Front Channel

• 24 - Rear Channel

• 25 - Trailer Channel

The maximum allotted time for each channel is 40 minutes for an inflate, or 20 a faulty compressor or similar problem resulting in inadequate air supply to the T

minutes for a deflate. The most likely cause is

ire Pressure Control System.

If the system air supply is function 4P! may indicate that a leak or restriction exists in an air passage. The components that may contain a leaking air passage include:

• Wheel valve air filters.

• Pneumatic Control Unit (PCU)

• Air supply lines.

• Wheel valve exhaust port (deflate mode only).

To identify the root cause of the problem, connect the diagnostic tool (see Diagnostics Section for test equipment and descriptions) 4P! Troubleshooting Tree.

or tire valve stems.

ing properly, code group

restricted or

vent port restriction.

and follow the procedure in the

See "Troubleshooting Tips" for general guidelines diagnostics.

on system

)

Channel Between Modes (Codes 23, 24, 25)

Verify Tire Pressure Control System air system

capacity by checking air system pressure buildup.

Service Codes

Does the air

system build up to at

least 125 psi?

Yes

Using the diagnostic tool, check

faults to identify the faulty channel:

Front (23) Rear (24) Trailer (25)

Initiate deflate mode on the

identified channel.

Are the wheel

valves deflating

slowly?

Yes

Repair air system and retest system.

Refer to Service Manual

Group: 4P! (Codes 23, 24,

On the tire or axles that deflate slowly, check for:

Restricted wheel valve exhaust port Clogged wheel valve filters Plugged tire valve stem

Refer to Service Manual

Initiate inflate mode on the identified channel

and check for crimped or restricted lines.

Group: 5P! (Codes 26, 27, 28)

Service Codes

Type: Low Pressure Reading

System Mode Condition Possible Causes

(Listed in Likely Order of Occurrence)

Pressure Check Only Extreme pressure loss - Leaking axle seals.

- Open line between Pneumatic Control Unit to channel.

- Crimped or plugged line between supply tank and Pneumatic Control Unit.

- Pressure switch failure, shorted closed.

- Pneumatic Control Unit failure, supply or control off.

- Faulty pressure transducer.

Air Pressure Check

The Tire Pressure Control System is not continuously pressurized; pressure checks occur on tire pressure checks, the system delivers compressed air to each channel for approximately two seconds while monitoring the pressure in that channel.

a periodic basis. During

Code Description

Group 5P! indicates an extreme pressure loss on the front (26), rear (27), or trailer (28) channels. Possible causes are leaking axle air seals or an open line, which would be clearly audible during pressure measurements.

Note: In extremely cold conditions

leak, resulting in a code 5P!. This code may clear by simply driving the vehicle for a few minutes to "warm up" the seals allowing proper system operation.

, air seals will sometimes

Other possible causes of a group 5P! are:

• Open line from Pneumatic Control Unit (PCU) to channel.

• Restricted line between the supply tank and Pneumatic Control Unit.

• Faulty PCU Sensor.

• Faulty PCU.

To identify the root cause of the problem, connect the diagnostic tool (see Diagnostics Section for test equipment and descriptions) 5P! Troubleshooting Tree.

See "Troubleshooting Tips" for general guidelines diagnostics.

and follow the procedure in the

on system

)

Low Pressure Reading (Codes 26, 27, 28)

Service Codes

Group: 5P! (Codes 26, 27,

Using the diagnostic tool, check faults to identify the faulty channel:

Front (26) Rear (27) Trailer (28)

Initiate inflate mode for the faulty channel.

Is there extreme

pressure loss?

Use the diagnostic tool to pressurize

and hold the faulty channel.

Does pressure

drop quickly?

Yes

Identify cause of air loss,

repair and recheck system.

Refer to Service Manual

Locate leak (check axle

vents for air leakage also),

repair and recheck system.

Is there a

restricted line between

the wet tank and

PCU?

After a pressure

check, is the pressure

reading <5 psi?

Check harness and PCU for open supply or

control solenoids. See Group 12C! PCU

Solenoids, Codes 54 or 56 for procedure.

Yes

Identify cause of air loss,

repair and recheck system.

Refer to Service Manual

Yes

Replace PCU sensor and recheck system.

Verify that the pressure switch opens when the supply tank is below 80 psi.

Note: Primary and secondary air brake gauges do not reflect actual pressure in

the supply tank.

Does the

pressure switch

open?

Replace pressure switch

and recheck system.

Refer to Service Manual

Yes

Replace PCU and recheck system.

Note: While replacing the PCU, pay particular

attention to possible air line contamination (e.g.,

oil, water, particles) which may suggest further

air system maintenance needs.

Refer to Service Manual

Does fault

reoccur?

Yes

Replace ECU and recheck system.

Note: ECUs are not a typical cause of problems. If

an ECU is replaced, the system should be carefully

rechecked to make sure the problem has been

fixed and does not reoccur.

Complete

Group: 7P! (Codes 31, 32)

Service Codes

Type: Low Air Supply

System Mode Condition Possible Causes

(Listed in Likely Order of Occurrence)

Pressure check only Pressure switch won’t

close (32)

Supply Tank pressure too

(32)

low

Pressure switch failed closed (31)

- Compressor governor cut-out set too low.

- Air dryer needs service.

- Pressure switch unplugged.

- Open or broken line from supply ta

- Crimped or plugged line from supply tank to Pneumatic Control Unit.

- Faulty pressure switch.

- Faulty compressor.

- Governor cut-in too low.

- Faulty compressor.

- Leaking lines.

- Wiring to pressure switch shorted together.

- Faulty pressure switch.

Air Pressure Check

The Tire Pressure Control System is not continuously pressurized; pressure checks occur on a periodic basis. During tire pressure checks, the system delivers compressed air to each channel monitoring the pressure in that channel.

for approximately two seconds while

The components that can cause the pressure switch to remain

en include:

• Air dryer needs service.

• Pressure switch unplugged or damaged wire

• Faulty pressure switch.

nk to Pneumatic Control Unit.

harness.

Code Description

Group 7P! displays if the system air pressure supply is too low to perform a valid tire pressure check.

This may occur because the pressure switch (inadequate air supply, code 32) or because the pressure switch or its wiring is shorted, allowing the actual supply pressure to be lower than anticipated by the system.

o assure a nominal compressor output, code 32 will

Note: T

not be set unless the pressure switch does not close for a preset period while the vehicle is being driven at a speed of over 20 mph.

will not close

• Faulty compressor.

• Open or broken line from supply tank to Pneumatic Control Unit.

• Crimped or plugged line from supply tank to Pneumatic Control Unit.

• Faulty Electronic Control Unit.

To identify the root cause of the problem, connect the diagnostic tool (see Diagnostics Section for test equipment and descriptions) Troubleshooting Tree.

See "Troubleshooting Tips" for general guidelines diagnostics.

and follow the procedure in the 7P!

on system

Low Air Supply (Codes 31, 32)

Use diagnostic tool to determine type of fault.

Pressure

switch failed. Open or

closed?

Closed

Verify wiring:

Switch off ignition. Disconnect ECU harness connector and supply tank pressure switch connector. Check for shorts between ECU harness connector pins G3 and K2.

Open

Service Codes

Is the governor

cutout pressure set

at 120-125 psig?

Yes

Is the pressure

switch plugged in?

Group: 7P! (Codes 31, 32)

Reset governor cutout

pressure and retest system.

Refer to Service Manual

Plug in pressure switch

and retest system.

Refer to Service Manual

Repair harness

and retest.

Yes

Replace pressure switch and retest.

Is there a

short?

Repair vehicle air supply

system and retest.

Refer to Service Manual

Yes

Using the diagnostic tool, verify

pressure switch operation.

Does the

pressure switch

close above 110

psi?

Yes

Verify air system capacity by checking

supply tank pressure buildup time.

Does the

flowchart steps and wait for fault to reoccur.

supply tank build

up pressure?

Yes

Service code is not active. Reverify

Verify wiring:

Switch off ignition. Disconnect ECU harness connector and supply tank pressure switch connector. Verify continuity between ECU harness connector pin G3 and pressure switch harness connector PRESS SW wire. Verify other press switch wire is grounded.

Are

connections

OK?

Yes

Replace pressure switch

and retest system.

Refer to Service Manual

Repair

harness and

retest.

Group: 8P! (Code 35)

Service Codes

Type: Atmospheric

System Mode Condition Possible Causes

(Listed in Likely Order of Occurrence)

Pressure check only Pneumatic Control Unit

pressure

out of range

- Faulty PCU Sensor.

- Faulty Pneumatic Control Unit.

- Faulty Electronic Control Unit.

Air Pressure Check

for approximately two seconds while

Code Description

When the system measures tire pressures it also uses the pressure sensor in the PCU to read atmospheric pressure. Group 8P! displays if the atmospheric pressure reading is out of range.

The components that can cause a gro

• Faulty PCU Sensor or wiring.

• Faulty Pneumatic Control Unit.

• Faulty Electronic Control Unit (ECU).

To identify the root cause of the problem, connect the diagnostic tool (see Diagnostics Section for test equipment and descriptions) Troubleshooting Tree.

up 8P! to be set include:

and follow the procedure in the 8P!

See "Troubleshooting Tips" for general guidelines diagnostics.

on system

Atmospheric (Code 35)

Using the diagnostic tool, read

the atmospheric pressure.

Service Codes

Is the reading

between 8 and 20

psia?

Yes

Service code is not active.

Reverify flowchart steps

and wait for fault to reoccur.

Is any audible air

flowing through the

PCU?

Yes

See service code No Code for audible air leak in PCU.

See service code 5C! PCU sensor

and follow troubleshooting chart.

Group: 8P! (Code 35)

Group: 9P! (Codes 36, 37, 38)

Service Codes

Type: Inflate Trend

System Mode Condition Possible Causes

(Listed in Likely Order of Occurrence)

Channel inoperative Loss of channel pressure in

inflate mode

- Damaged or leaking tire.

- Leaking lines.

- Leaking seals.

- Leaking wheel valve.

- Faulty Pneumatic Control Unit.

- Faulty Electronic Control Unit.

Code Description

Group 9P! displays when system pressure is dropping while in inflate mode. This can occur when air is leaking from the tire(s) or the system more quickly than the compressor can replace it. The air leak that is causing a code 9P! is often audible. Codes 36, 37 and 38 designate the condition on the front,

trailer channel respectively.

rear or

The air leak can be located either before or after the wheel

location. The components located before the wheel

valve valve that may cause a group 9P! include:

• Leaking control lines between the PCU and the wheel ends.

Components located after the wheel valve code 9P! include:

• Tire damage.

• Rim leaks.

• Valve stem leaks.

• Leaking air lines from the wheel valve.

• Faulty wheel valve.

To identify the root cause of the problem, connect the diagnostic tool (see Diagnostics Section for test equipment and descriptions) Troubleshooting Tree.

that may cause a

and follow the procedure in the 9P!

• Leaking axle air seals.

• Leaking wheel valve inlet lines or exhaust port.

See "Troubleshooting Tips" for general guidelines diagnostics.

on system

)

Inflate Trend (Codes 36, 37, 38)

Service Codes

Group: 9P! (Codes 36, 37,

Using the diagnostic tool, check

faults to identify the faulty channel:

Front (36) Rear (37) Trailer (38)

Is there a

damaged tire on

the identified

channel?

Initiate inflate mode on the faulty channel.

Yes

Repair tire and retest system.

Are there any

leaks in the

channel’s control

lines or seals?

Yes

Repair leak and retest.

Is there a leaking

hose between a tire

and wheel valve?

Is a wheel valve

leaking through the

valve exhaust?

Yes

Replace the hose and

retest the system.

Replace the wheel valve

and retest the system.

Is air leaking

out the PCU vent

port?

Service code is not active. Reverify

flowchart steps and wait for fault to reoccur.

Yes

Replace PCU and retest.

Note: While replacing the PCU, pay particular attention to possible air line contamination (e.g., oil, water, particles) which may suggest further air system maintenance needs.

Group: 10P! (Codes 41, 42, 43)

Service Codes

Type: Tire Leak (Confirm)

System Mode Condition Possible Causes

(Listed in Likely Order of Occurrence)

Inflate only Channel confirmation

failure

- Damaged or leaking tire.

- Leaking line between wheel valve and tire.

- Air passage restriction.

- Wheel Valve shut off failure.

Air Pressure Check

for approximately two seconds while

Code Description

Group 10P! code indicates that the system is unable to confirm that tires on a given channel are able target pressure when the channel is depressurized. After any change of pressure on a given channel, the Tire Pressure Control System will return to that channel to confirm, or "double-check" the new pressure before returning to the periodic check interval. If the pressure is not the same, or

than the last reading, the system will inflate again, and

more then reconfirm that channel. After 7 - 10 confirmation attempts, the system will log a 10P! code, and complete operations on any remaining channel. It will then illuminate

"check tires" warning (or code 10P! on the OCP), and the

the appropriate channel indicator and continuously pressurize the subject channel to inflate the tire(s) and sustain the tire pressure. In this manner, the system will determine whether the failure to confirm (codes 41, 42, and 43 on front, rear, and trailer respectively) or failure of the wheel valve to properly close.

was due to tire or air line leakages

to sustain the

A confirmation failure can be caused by:

• Damaged or leaking tire(s).

• Leaking air line between the wheel valve and tire.

• Air passage restriction between the

• Wheel valve contamination or failure.

To identify the root cause of the problem, connect the diagnostic tool (see Diagnostics Section for test equipment and descriptions) Troubleshooting Tree.

See "Troubleshooting Tips" for general guidelines diagnostics.

PCU and the

wheel valve.

and follow the procedure in the 10P!

on system

Note: Leaks

from the tire(s) may be noted after the truck has been idle overnight, as the tire(s) lose(s) air when the truck is off and the system inoperative. By observing the time required to achieve normal tire pressures after starting the vehicle, many tire punctures can be identified well before the tire incu

rs non-repairable damage.

)

Tire Leak (Confirm) (Codes 41, 42, 43)

Service Codes

Stop vehicle and connect the diagnostic tool to the system.

Identify affected channels:

Front (41) Rear (42) Trailer (43)

Tire or air line leak

Spray soap solution on tires, bead area, wheel valve and wheel valve hose. Repair all leaks and perform checkout test.

Group: 10P! (Codes 41,

42 43

Group: 11P! (Codes 44, 45, 46)

Service Codes

Type: Tire Leak (Imbalance)

System Mode Condition Possible Causes

(Listed in Likely Order of Occurrence)

Channel only checks pressure

Tire pressure lower on one tire

than others on same

channel

- Minor tire leakage at start-up (leaked down overnight).

- Severe tire damage or leaks.

- Leaking lines.

- Contaminated wheel valve

- Restricted tire valve stem.

- Leaking seals.

- Leaking wheel valve.

- Crimped or restricted control lines.

Air Pressure Check

for approximately two seconds while

Using a tire pressure gauge to sures on the indicated channel will allow you to identify the specific tire allow the vehicle sit overnight for sufficient air loss to occur.

To identify the root cause of the problem, connect the diagnostic tool (see Diagnostics Section for test equipment and descriptions) Troubleshooting Tree.

Code Description

See "Troubleshooting Tips" for general guidelines

Group 11P! indicates that pressure imbalance may exist between the tires on the front (44), rear (45), or trailer (46) channel after the system has achieved the target pressure.

diagnostics.

filters.

manually compare tire pres-

involved. Very slow leaks may require that you

and follow the procedure in the 11P!

on system

This code can be caused by:

• Damaged tire(s) - (tires will continue to lose air after the vehicle is

• Leaking air lines between the wheel valve and tire (tires will con off).

• Plugged or contaminated wheel valve filter(s) - one tire of an and 11P! will be set after completion of the deflate sequence due to one tire being higher in pressure.

• Leaking air lines between the PCU and wheel valve -

may not exhibit actual imbalance; air line leaks

tires between PCU and wheel valve resulted in pneumatic signature which imitated the fault.

shut off).

tinue to lose air after the vehicle is shut

axle group will deflate slower than others

)

Tire Leak (Imbalance) (Codes 44, 45, 46)

Use diagnostic tool to verify proper vehicle configuration selection.

Using the diagnostic tool, identify the faulty channel:

Front (44) Rear (45) Trailer (46)

Manually check the tire pressures at

the wheel valves on the faulty channel.

Are any wheel readings low?

Service Codes

Yes

Check the following:

Tire Damage Wheel valve filter Air line leaks Wheel seal air leaks Wheel valve leaks

Repair faulty components and recheck the system.

Refer to Service Manual

Check for a blocked wheel valve

exhaust or plugged wheel valve filter.

Make repairs to faulty components and

recheck the system.

Refer to Service Manual

Place the channel into the inflate mode and check for audible leaks.

Make repairs to faulty

components and recheck system.

Refer to Service Manual

Yes

Place the channel into the hold mode and

check for leaks using a soap solution if

necessary to locate the source of the leak.

Are any wheel

readings high?

Is there an audible leak? (Also check axle

vents.)

Is leak found?

Yes

Place channel in

normal mode.

Does wheel

valve close?

Replace the wheel valve

and recheck system.

Refer to Service Manual

Yes

Group: 11P! (Codes 44,

45 46

Check the system for

kinked lines. Repair

faulty components and

recheck the system.

Refer to Service

Manual

Make repairs to faulty components and recheck system.

Refer to Service Manual

Service Codes

Group: 12P! (Codes 61, 62, 63, 64, 65, 66)

Type: Wheel Valve Shut Off

System Mode Condition Possible Causes

(Listed in Likely Order of Occurrence)

Normal Operation Loss of pressure during

shu

t off

- Wheel Valve shut off failure.

- Air passage restriction.

Air Pressure Check

for approximately two seconds while

Code Description

Group 12P! code indicates that the system is unable to confirm that tires on a given channel are able to sustain target pressure when the channel is depressurized. After any change of pressure on a given channel, the Tire Pressure Control System will return to that channel to confirm, or "double-check" the new pressure before returning to the periodic check interval. If the pressure is not the same, or more tha then reconfirm that channel. After 7 - 10 confirmation attempts, the system will log a 12P! code, and complete operations on any remaining channel. The system will the loss of air due to wheel valve closure as minor (codes 61, 62, and 63 on front, rear, and trailer respectively) or major (codes 64, 65, and 66 on front, rear, and trailer respectively).

the

n the last reading, the system will inflate again, and

classify

Note: Leaks

A confirmation failure can be caused by:

• Damaged or leaking tire(s).

• Leaking air line between the wheel valve and tire.

• Air passage restriction between the

• Wheel valve contamination or failure.

To identify the root cause of the problem, connect the diagnostic tool (see Diagnostics Section for test equipment and descriptions) Troubleshooting Tree.

See "Troubleshooting Tips" for general guidelines diagnostics.

wheel valve.

and follow the procedure in the 10P!

non-repairable

PCU and the

on system

)

Wheel Valve Shut Off (Codes 61, 62, 63, 64, 65, 66)

Service Codes

Group: 12P! (Codes 61,

62 63

Stop vehicle and connect the diagnostic tool to the system.

Which codes

are identified?

Codes 61, 62, 63

Codes:

Front (61) Rear (62) Trailer (63)

Wheel valve closure (minor)

Check airflow and look for restrictions

between the wheel valve and PCU.

Codes 64, 65, 66

Codes:

Front (64) Rear (65) Trailer (66)

Wheel valve closure (major)

Replace wheel valve and

perform checkout test.

Were

restrictions

found?

YesNo

Repair restrictions and

perform checkout test.

Service Codes

Code: No Code

Type: Miscellaneous

Although the Tire Pressure Control System is self-diagnosing, there are some problems that may not trigger a service code. The following chart lists these conditions along with possible causes and solutions:

Condition Operating problems that do not trigger a service code.

DRIVER INTERFACE (DDM or OCP)

Intermittent Driver Inter

No operation (blank display). - Fuses.

Blank Driver Interface. - No power to Driver Interface.

Operator Control Panel display is always

im and no backlighting on Operator

d Control Panel buttons.

System loses programmed tire pressure settings.

face operation. Intermittent ground or power connection

Possible Causes* Since a service code was not set, these

tions may be universal and not

condi call for a troubleshooting routine.

to Driver Interface or Electronic Control Unit.

- Faulty ground or power connection.

- Bad ground to Driver Interface.

- Bad switched ignition line to Driver Interface.

- Faulty Driver Interface.

- Voltage out of range (9-18 volts).

Lamp 2 wire is disconnected. It should be grounded for "bright" and tied to +12V for "dim" and backlight.

- Intermittent connection at config connector.

- Improperly followed programming procedure.

- Faulty Electronic Control Unit.

Service Where fault codes appear, refer to the

ubleshooting procedures listed

tro under that code.

Follow troubleshooting for 4C! group.

- Check fuses.

- Repair power/ground.

Follow troubleshooting for 4C! group.

See wiring schematic or Installation Guide.

- See wiring schematic.

- Reference programming procedure.

- Replace Electronic Control Unit.

No display of pressures on Control Panel.

No display of pressures and no apparent inflate or deflate.

* Possible causes are listed in order of likely occurrence.

Operator

Operator Control Panel is in Quiet Mode. Refer to "Select Key" in section 3 of

Pressure switch not closed. Follow troubleshooting for 7P! group.

ECU left in DIAGNOSTIC mode. Move vehicle > 5mph.

Operator Instructions.

Service Codes

Condition Operating problems that do not trigger a service code.

TIRE PRESSURE

Display shows tires at higher pressure than target, yet system does not a to deflate. No apparent inflate or deflate.

Pressure imbalance (tires on same channel at different pressures).

No inflate or deflate of particular tire. Valve stem core not removed on tire. Remove hose from tire valve stem and

Inaccurate tire pressures. - Leaking control lines.

AIR LEAKS

Air bleeding from rear axle vents. Air Seal degradation. Refer to Service Manual.

ttempt

Possible Causes* Since a service code was not set, these

tions may be universal and not

condi call for a troubleshooting routine.

Tire pressure rises due to temperature are not bled off by the Tire Pressure Control System. This is normal operation.

- Defective hose.

- Clogged filters.

- Faulty pressure transducer.

- Incorrect config. conn connection.

- Faulty Electronic Control Unit.

ector or bad

Service Where fault codes appear, refer to the

ubleshooting procedures listed

tro under that code.

System will only initiate a deflate if a

with a lower target pressure than

mode current target is selected.

Follow troubleshooting for 11P! group.

remove core. Replac

Follow troubleshooting for 8P! and 11P! gro

up.

See wiring schematic.

e hose.

No Code

Tires fail to deflate when lower pressures are requested.

Leaking tires. - Damaged tire.

Air bleeding (audible) through Pneumatic Control Unit when ignition is

rned off.

* Possible causes are listed in order of likely occurrence.

Pneumatic system problem. Follow troubleshooting for 3P! group.

- Loose connection between wheel valve and tire.

- Loose/leaking tire valve stem.

- Faulty wheel valve.

Wheel valve is leaking back through control lines.

Refer to Service Manual.

Identify tire with low pressure and determine obstruction or replace wheel valve.

Service Codes

Condition Operating problems that do not trigger a service code.

OTHER

Apparent continuous operation, or slow inflates or deflates.

System stopped in midd deflate (display shows completion before reaching targeted pressures).

Wheel end oil leak. Faulty air or oil seal. Refer to Service Manual.

Trailer present, not detected. - Disconnected trailer air line connector.

Trailer detected, not present. - Trailer connector on tractor side

High reading (>100 psi) on trailer channel with no trailer connected.

le of inflate or

Possible Causes* Since a service code was not set, these

tions may be universal and not

condi call for a troubleshooting routine.

- Tire(s) leakage.

- Between mode.

- Trend fault.

Intermittent Pneumatic Control Unit sensor, short, or open.

- Clogged trailer air lines.

- Crimped control line on trailer channel.

doesn't seal when disconnected.

- Leaking line between Pneumatic Control Unit and trailer air line connector.

Leaking trailer connector. Refer to Service Manual.

Service Where fault codes appear, refer to the

ubleshooting procedures listed

tro under that code.

Follow troubleshooting for 4P!, 9P!, and 10P! group

Follow troubleshooting for 5C! group.

Refer to Service Manual.

No communications by the PC diagnostic or handheld tool.

* Possible causes are listed in order of likely occurrence.

- No power to the communication interface box (comm. box).

- No communications to comm. box.

- Faulty comm. box.

- Verify power to the communication interface box (comm. box).

- Verify ECU connection to data link (see wiring diagram).

- Try different comm. box.

Service Codes

This page intentionally left blank.

No Code

Service Procedures

Final System Checkout

Test Requirements

This test requires use of a diagnostic tool (PC or handheld) to control and monitor the functions of the Spicer TPCS, and an accurate tire pressure gauge.

Select Highway-Loaded. Upon successfully achieving Highway-Loaded, verify tire pressures are within ± psig of desired pressure. If significant tire imbalance exists, balance should be achieved by using the system to generate a short deflate, followed by re-inflating the tires, or by manually adjusting.

Verify governor cut-out pressure: ________________________________________ (Acceptance criteria: 120-125 psig)

Verify the Pressure Switch cycles open & closed during inflation: Yes / No

Use Diagnostic tool to verify proper configuration: ________________________________________________________

If downloadable configuration is used, verify proper pressure settings, speeds, etc. have been set.

Use Diagnostic

• Clear any existing historical codes.

Use Diagnostic tool to PERFORM DIAGNOSTIC TESTS.

• Select channel and "Pressure Check Tires and Hold" option to pressurize each individual channel. Check for air leaks;

System Pressure: Front Rear Trailer

Initial Pressure

Pressure after 10 sec.

Acceptance criteria: Pressure should not drop.

• Select item "Pneumatic Control Unit," then "Read Isolated PCU Vacuum" and record PCU vacuum. Next, individually

Isolated PCU Vacuum Front Rear Trailer

(PSIA) (inHg) (inHg) (inHg) (inHg)

tool to DISPLAY SERVICE CODES.

record the initial pressure and then the stabilized pressure 10 seconds later.

select each channel and record System Pressure while deflating:

Acceptance criteria: Isolated PCU < 22 inHg, Individual channels ±1 inHg of Isolated PCU

Use Diagnostic tool to MONITOR SYSTEM.

Service Procedures

• Deflate the system by selecting Highway-Unloaded. Upon successfully gauge to verify tire pressures are within ±3 psig of desired pressure.

• Select Highway-Loaded. Upon successfully achieving Highway-Loaded, within ±3 psig of desired pressure.

• Drive vehicle and verify diagnostic tool display coincides with vehicle speedometer count in the "Modify System Data" section of the diagnostic tool.

Is the vehicle speed calibrated? Yes / No

Use Diagnostic tool to DISPLAY SERVICE CODES.

• Verify no codes have been set during checkout process

Note: If any suspected

issues arise, inflation and deflation to other mode settings is appropriate to aid diagnosis.

(clear if necessary). Exit diagnostics.

achieving Highway-Unloaded, use pressure

use pressure gauge to verify tire pressures are

. If not, recalibrate the pulse/mile

Final System Checkout

Service Procedures

Pneumatic Control Unit - Cleaning and Inspection

The following describes the procedure for disassembly, cleaning, and inspection of the Spicer Tire Pressure Control System Pneumatic Control Unit (P/N 673336, and 673316). Components requiring replacement can be found in the Illustrated Parts List (AXIP-0010).

CAUTION

Do not use cleaning solvents which are not compatible with elastomer or rubber components. Use of Brake Cleaners, or solvents containing Xylene or Methyl Ketone, is not recommended.

1. Remove unit from the vehicle (refer to Service Manual AXSM-0010).

2. Remove bottom cover plate screws (10e), cover plate (10a), and gasket (10b). If the unit has a trailer module, remove screws (10e), plate (10c), and gasket (10d).

3. All cartridges (8) are normally open units with the exception of the supply channel (9) which is normally closed. Ensure the normally closed cartridge (9) is reinstalled in the su ing.

The cartridges can be removed by pulling them

from the bottom of the PCU.

4. If the unit is a 3-channel system, remove 6 solenoid cover screws (3c) and 4 trailer module cover screws (7c).

5. Lift solenoid cover and trailer module cover together to clear solenoids.

6. Remove solenoids from operators by removing 9/16" hex nuts on top of solenoids.

7. Remove solenoid operators from PCU body using a 1" wrench on the brass base (13).

Note: All operators with the exception of the deflate operator

are 3 way (indicated by threaded port in top of part). Do not mix deflate operator or its internal plunger (15) with other operators, or plungers (14). Ensure that both Orings (11,12) in operator bases are not lost.

8. Remove operator stem from base (13) on all operators using spanner wrench (16). If spanner wrench is not available, double

the 9/16" hex nuts) will enable disassembly.

(with

pply port following clean-

nutting the operator stem

Note: Deflate plunger (15) is specific to the deflate operator,

and is identified by its solid metal top. If poppets appear in good condition, thoroughly clean poppet and operator assembly. Verify the absence of any "sticky" residue from oil contamination.

10. Reassemble each operator with the base. Do not install assemblies on PCU body until it is completely cleaned.

11. Spray cleaning solvent on cartridge bores within PCU body to remove debris and oil residue. Thoroughly dry cartridge bores prior to further assembly.

12. Replacing cartridges is not typically required; however, it may be desirable to replace the 3 outer O-rings on each or any individual cartridge. These are standard nitrile O-rings and the sizes are provided on the following page. Replacement cartridges Parts List (AXIP-0010).

13. Lightly lube cartridge O-rings with silicone grease and install cartridges in body, verifying that the one normally closed cartridge (9) is installed in the Supply (IN) port.

Note: Excess lube on piston O-rings can block hole from sole-

noid to top of piston. Be careful only to wipe lube on O-rings. Do not pack grooves.

14. Install base gasket (10b), base cover plate (10a), and screws (10e). If 3-channel Pneumatic Control Unit, install gasket (10d), plate (10c), and screws (10e). Torque screws 40 to 45 in. lbs.

15. Verify presence of O-rings in bases of solenoid operator assemblies and reinstall operators onto Pneumatic Control Unitbody. Verify 2-way operator (solid metal top) is in Deflate location. Specific location of other operators (3-way) is not important.

16. Install solenoids on operators verifying proper location per labels on solenoids and Cont

17. Carefully tuck solenoid wires in area between transducer and solenoids while reinstalling the solenoid covers.

are available

rol Unit body.

if required. See Illustrated

Pneumatic

9. Inspect condition of poppets (14,15) inside operator.

Service Procedures

Note: It is necessary to position both covers on the body at

the same time.

18. Carefully tighten cover screws ensuring that wires pinched between cover and body. Torque

are not screws 40 to 45 in. lbs.

19. Reinstall Pneumatic Control Unit in vehicle.

20. Conduct TPC system checkout to verify

cleaning/assembly.

integrity of

PCU - Cleaning and

Ins

ection

Solenoid Assembly and Cartridge

Typical Pneumatic Control Unit Assembly

Service Procedures

Optional Trailer Channel

10b

10e

10d

10c

10a

10e

Typical Solenoid Assembly

Service Procedures

PCU Cleaning

& Inspection

Solenoid Assembly &

Cartrid

Typical Cartridge

PISTON 0-RING

(-114)

CARTRIDGE 0-RING

(-020)

Service Guidelines

Service Procedures

The Tire Pressure Control System requires normal maintenance much the same as other systems on the vehicle. Following are some general rules that apply to Tire Pressure Control System service:

Clean and Dry Air Supply

The Spicer Tire Pressure Control System requires a constant supply of clean dry air. An adequately sized and properly maintained air dryer is critical for continued proper operation of the Tire Pressure Control System. Even though the air dryer may be working properly, moisture can accumulate in the supply tank during normal operation due to the increase in air consumption. It is important to drain the supply tank daily. Draining the supply tank completely when the truck is not in use will also help keep moisture under control.

Line Replacement and Routing

When replacing air lines, do not allow kinks, sharp bends or stretching in order to tighten joints. If any tube or hose segment does not appear to fit easily, it could mean you are not

ing the proper part or that you are not following service

us procedures properly. Ensure that replacement lines are the correct length and size. Be cautious of any contaminants (rubber flash, plastic particles, etc.) getting into the lines when replacing them.

Joint Compounds and Fittings

Here are some important "DO's" and "DON'Ts" regarding the use of thread sealant

• Do apply a thin coating of PTFE based compound on male threads of pipe joints, tubing connections, and other system fittings.

• Don't use any compound on O-ring, compression, or flare fitting connections. Instead, apply a thin coat of silicone grease to O-rings and flares.

• Don't use Teflon thread tape anywhere in the air system. (Teflon tape shreds can become lodged in valves and cause malfunctions.)

• Do follow manufacturer recommended guidelines when tightening fittings.

Each segment of the pneumatic system must be secured to the vehicle frame or other installed line. After completing assembly of each segment, use cable ties to anchor the segment at approximately 18" intervals.

CAUTION

Proper Tire Pressure Control System operation requires correct air line diameters and lengths for each channel. Incorrect air line replacement can affect both performance and operation of the system. Refer to the Tire Pressure Control System service manual for length and diameter information.

Service Procedures

Air Filter Change

The "Air Filter Change" illustration shows the location of the air filter in each wheel valve. This filter must be replaced whenever the tire or wheel valve is ser a reference in completing the air filter replacement as follows:

Be sure to use appropriate eye and ear protection.

Do not crush the air filter when installing adjustable

t thread O-ring adapters.

straigh

Note: Air filters should not be cleaned or

replace with a new air filter.

1. Working quickly to prevent air loss, remove the tire hose assembly from the fitting on est the tire fill valve) of the wheel valve. Plug hose to

viced. Use the illustration as

WARNING

CAUTION

reused. Always

the tire port (near-

prevent air loss (SAE size, 9/16-18 thread).

2. Remove the adapter fitting from the tire port.

3. Use a flat blade screwdriv counterclockwise) the air filter from the wheel valve. Discard the used air filter.

4. Install a new air filter by pressing it straight into wheel valve

5. Clean the adapter, replace and lubricate the O-ring if necessar tire port. Tighten to 16-19 lbs. ft.

6. Remove the plug and reinstall the tire hose assembly to the adapter on 16-19 lbs. ft.

Note: For insta

adapters, follow instructions in the service manual to prevent crushing the filter.

tire port.

y and reinstall the adapter in the wheel valve

llation of adjustable straight thread O-ring

37 degree flare plug, 3/8" tube

er to remove (unscrew

the wheel valve tire port. Torque to

Control Port

Air Filter Change

Tire

Hose

Adapter

Air

Filter

Tire Port

Wheel

Valve

Service Procedures

Troubleshooting Wheel End Seals

Perform an air seal pressure check as follows (refer to "Wheel End Seals" illustration).

1. Connect a hose from a pressure long with 2' long 3/8" hose (or equivalent volume), to the inlet tube.

2. Plug hub air port with a 3/8" pipe plug or 9/16-18

ght thread O-ring plug, as appropriate.

strai

3. Open the valve from the air supply line and stabilize the pressure in th

Close air supply valve. Rotate monitoring the pressure gauge. The pressure reading should not drop more than

Note: If the air l

may need to be rotated several times to ensure a complete pressure seal.

If air leakage rate remains outside of accepted limit, locate

ce of leak:

sour

• Loose Fittings.

• Spindle/Sleeve Outer O-ring.

• Air Seals.

Refer to the Service Manual for

eakage exceeds 15 PSI in 20 seconds, the hub

e reservoir to 100 PSI minimum.

the hub assembly while

15 PSI in 20 seconds.

replacement procedure.

reservoir, 2" ID x 12"

Service Procedures

Wheel End Seals

Shop Air

Supply

Air Port Plugged for Test

Wheel End Seals

Reservoir

2" I.D. Pipe, 12" Long

Oil Fill Plug

2' Long, 3/8" I.D. Hose

Air Seals

Backup Ring and O-Ring

O-Ring

O-Rings Required on Hubs with Grooves

Service Procedures

Hose and Supply Tank Selection Chart

CAUTION

The following hose lengths and sizes are necessary for correct TPCS operation.

Any deviations may cause the system to function incorrectly

may reduce the ability to detect low tires.

and

Front Channel Plumbing Requirements

Min. Tank Size Main Run Jounce

Standard Front (1 Axle) 1400 in3 18' to 20' 5/8" OD 6' to 8' per axle 5/16" ID Only

(6 gal.) 21' to 23' 13/32" ID 6' to 8' per axle 5/16" ID Only

25' to 27' 1/2" OD 6' to 8' per axle 5/16" ID Only

Dual Front (2 Axle) Both Non-Driven 1400 in3 18' to 21' 5/8" OD 6' to 8' per axle 5/16" ID Only

(6 gal.) 21' to 25' 13/32" ID 6' to 8' per axle 5/16" ID Only

25' to 29' 1/2" OD 6' to 8' per axle 5/16" ID Only

Dual Front (2 Axle) 1 Driven, 1 Non-Driven 2800 in3 18' to 21' 5/8" OD 6' to 8' per axle 5/16" ID Only

(12 gal.) 21' to 25' 13/32" ID 6' to 8' per axle 5/16" ID Only

25' to 29' 1/2" OD 6' to 8' per axle 5/16" ID Only

Rear Channel Plumbing Requirements

Min. Tank Size Main Run Jounce

Single Rear (1 Axle) 1400 in3 15' to 17' 5/8" OD 7' to 9' per axle 5/16" ID Only

(6 gal.) 18' to 20' 13/32" ID 7' to 9' per axle 5/16" ID Only

21' to 24' 1/2" OD 7' to 9' per axle 5/16" ID Only

Tandem Rear (2 Axle) 1400 in3 14' to 17' 5/8" OD 7' to 9' per axle 5/16" ID Only

(6 gal.) 16' to 20' 13/32" ID 7' to 9' per axle 5/16" ID Only

18' to 24' 1/2" OD 7' to 9' per axle 5/16" ID Only

Tridem Rear (3 Axle) 2800 in3 16' to 20' 13/32" ID 5' to 7' per axle 5/16" ID Only

(12 gal.) 18' to 24' 1/2" OD 5' to 7' per axle 5/16" ID Only

Service Procedures

Trailer Channel Plumbing Requirements

Min. Tank Size Main Run Jounce

(Tractor) PCU to Glad Hand* N/A 16' to 22' 5/8" OD

19' to 25' 13/32" I D

22' to 30' 1/2" OD

Single Trailer (2 to 3 Axles) 1400 in3 35' to 40' 1/2" OD 7' to 9' per axle 5/16" ID Only

(6 gal.) 40' to 50' 5/16" ID 7' to 9' per axle 5/16" ID Only

Dual Trailers (4 to 5 Axles) 2800 in3 60' to 85' 1/2" OD 7' to 9' per axle 5/16" ID Only

(12 gal.) 75' to 100' 5/16" ID 7' to 9' per axle 5/16" ID Only

Notes:

1. Air line sizes shown with an outer diameter measurement are for DOT approved nylon air brake tubing meeting SAE J844. Air line sizes shown with an inner approved reinforced rubber hose meeting SAE J1402.

2. For Pneumatic Control Unit to Glad Hand plumbing when using a length in the overall measurement. Example: A 22' coil air hose with a 15' working length is actually 22' in length.

3. Wire braid hose diameter is inside diameter (I.D.). Nylon hose diameter is outside

diameter measurement are for DOT

coiled hose, include the coiled hose

diameter (O.D.).

Hose Selection Chart

Wire Harness

Connector Illustrations (All views shown looking into connector)

Harness Connectors

OCP

ABCDE ABCDE ABCDE

J1939 / Can Link DDM Load Switch

5A 2A

5B 2B

810

Harness and Component Connectors

Harness Component

Pressure Switch

ECU

FGHJK FGHJK FGHJK

3 2 1

DDM Terrain Switch

5A 2A

5B 2B

810

Diagnostics

6-Pin9-Pin

DDM Display

Speed Sensor

PCU Sensor

Configuration

PCU Sensor

PCU 10-way

ABCDE

KHGF

ABC

PCU Sensor Connector

PCU Connector

Pneumatic Control Unit

ACB

ABCD

CBA

EFDGCHBA

Wire Harness

Electrical Schematic

Note: Schematic is shown for "point- to-point" troubleshoot-

ing only. Actual OEM implementations may vary with bulkhead connectors, etc.

ECU Connector

PRESS SW

COMM+

COMM-

POWER

J1708A

J1708B

F3SPEED F2SPEED

F1COND SPEED

J1DIMMER

D3BUZZER

K2GROUND

BUZZER

PRESS SW

GROUND

POWER

GROUND

J1708A

J1708B

SPEED

COND SPEED

9 PIN/6 PIN

B/C

A/E

F/A

G/B

ASPEED B

DIMMER

BUZZER OUTPUT

PRESSURE

SWITCH INPUT

GROUND

LAMP

J1587

DIAGNOSTIC

SPEED SENSOR INPUT

CONDITIONED SPEED INPUT

DIMMER INPUT

Note: Not used with DDM.

(0V= Dim, 12V = Bright)

(5V, 25mA MAX)

COMM+

COMM-

GND

POWER

LAMP

SWACC

{

DRIVER INTERFACE

Note: Actual connector may not be present. See next page for options OCP or DDM.

VEHICLE POWER PANEL

GND

DASH

LAMPS

15 A FUSE

+VBATT

IGNITION

SWITCH

Electrical Schematic

J1939 SHIELD

J1939+

A1J1939(+)

A2J1939(-)

G1 CONFIG 1

G2CONFIG 2

J1939 SHIELD

J1939-

GROUND

CONFIG 1

POWER

CONFIG 2

J1939 COMMUNICATIONS

CONFIGURATION SELECTION

Jumper plug may tie each config line to POWER or GROUND to select config. See configuration connectors for details.

PNEUMATIC CONTROLLER

SUPPLY

B1 SUPPLY SOL

B2DEFLATE SOL

B3CONTROL SOL

D1STEER SOL

D2DRIVE SOL

E1TRAILER SOL

H1XDCR SIGNAL

H2XDCR VREF

H3XDCR COMMON

DEFLATE

CONTROL

STEER

DRIVE

TRAILER

3 CHANNEL SYSTEMS ONLY

PCU SENSOR

Driver Interface Options

Driver Display Module (DDM)

Wire Harness

COMM+

COMM-

GROUND

POWER

LAMP/DIMMER

GROUND

POWER

COMM+

COMM-

DIMMER

POWER

GROUND

POWER

DIMMER

Display

Load Switch

Terrain Switch

Operator Control Panel (OCP)

COMM+

COMM-

GROUND

POWER

LAMP/DIMMER

NO CONNECTION

Configuration Connections

CONFIG 0

HARNESS

CONNECTOR

GROUND A

CONFIG 1 B

POWER C

CONFIG 2 D

A B C D

Wire Harness

Configuration Connections

WITH OPTIONAL TRAILER:

HARNESS

CONNECTOR

GROUND A

CONFIG 1 B

POWER C

CONFIG 2 D

HARNESS

CONNECTOR

GROUND A

CONFIG 1 B

POWER C

CONFIG 2 D

HARNESS

CONNECTOR

GROUND A

CONFIG 1 B

POWER C

CONFIG 2 D

CONFIG 1

A B C D

CONFIG 2

A B C D

CONFIG 3

A B C D

(BOTH STEERS NON-DRIVEN)

WITH OPTIONAL TRAILER:

(1 STEER DRIVEN, 1 STEER NON-DRIVEN)

WITH OPTIONAL TRAILER:

HARNESS

CONNECTOR

GROUND A

CONFIG 1 B

POWER C

CONFIG 2 D

CONFIG 4

A B C D

WITH OPTIONAL TRAILER:

Configuration Connections

CONFIG 5

HARNESS

CONNECTOR

GROUND A

CONFIG 1 B

POWER C

CONFIG 2 D

HARNESS

CONNECTOR

GROUND A

CONFIG 1 B

POWER C

CONFIG 2 D

A B C D

CONFIG 6

A B C D

Wire Harness

WITH OPTIONAL TRAILER:

(Reserved)

HARNESS

CONNECTOR

GROUND A

CONFIG 1 B

POWER C

CONFIG 2 D

HARNESS

CONNECTOR

GROUND A

CONFIG 1 B

POWER C

CONFIG 2 D

CONFIG 7

A B C D

CONFIG 8

A B C D

(BOTH STEERS NON-DRIVEN)

WITH OPTIONAL TRAILER:

(1 STEER DRIVEN, 1 STEER NON-DRIVEN)

WITH OPTIONAL TRAILER:

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For spec‘ing or service assistance, call 1-877-777-5360 or visit our website at www.dana.com

Dana Commercial Vehicle Products Group

3939 Technology Drive Maumee, Ohio, USA 43537

www.dana.com

All applications must be approved by the Application Engineering Department. Speciﬁcations and/or design are subject to change without notice or obligation. Printed in USA AXTS-0020 04/07

Spicer TPCS Troubleshooting Guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Warnings and Cautions

Tire Pressure Control System

Key Features

Component Description

Wheel Valve

Electronic Control Unit (ECU)

Driver Interface

Vehicle Speed

Pressure Switch

Air Lines

Wiring

Pneumatic Control Unit (PCU)

Simplified System Schematic

Operator Instructions - Driver Display Module (DDM)

Warning Icons

System Operation

Tire Pressure Control System Programming

Operator Instructions - Operator Control Panel (OCP)

Warning Icons

System Operation

Tire Pressure Control System Programming

OCP Programming Chart

Diagnostics

Test Equipment

Tire Pressure Control System Diagnostics

Service Codes

Test Modes

Historical Service Codes

PC Diagnostics

Handheld Tester

Multimeter

Troubleshooting Tips

Service Code Summary

Group: 1C! (Code 17)

Code Description

Group: 3C! (Codes 18, 76, 77)

Code Description

Group: 4C! (Code 15)

Code Description

Group: 5C! (Codes 33, 34)

Code Description

Group: 12C! (Codes 51, 52, 53, 54, 55, 56)

Code Description

Group: 1P! (Codes 11, 12, 13, 16, 22)

Code Description

Group: 2P! (Code 14)

Code Description

Group: 3P! (Code 21)

Code Description

Group: 4P! (Codes 23, 24, 25)

Code Description

Group: 5P! (Codes 26, 27, 28)

Air Pressure Check

Code Description

Group: 7P! (Codes 31, 32)

Air Pressure Check

Code Description

Group: 8P! (Code 35)

Air Pressure Check

Code Description

Group: 9P! (Codes 36, 37, 38)

Code Description

Group: 10P! (Codes 41, 42, 43)

Air Pressure Check

Code Description

Group: 11P! (Codes 44, 45, 46)

Air Pressure Check

Code Description

Group: 12P! (Codes 61, 62, 63, 64, 65, 66)

Air Pressure Check

Code Description

Code: No Code

Final System Checkout

Pneumatic Control Unit - Cleaning and Inspection

Solenoid Assembly and Cartridge

Service Guidelines