Page 1
TABLE OF CONTENTS
1.0 INTRODUCTION .........................................................1
1.1 SYSTEM COVERAGE ...............................................1
1.2 SIX-STEP TROUBLESHOOTING PROCEDURE ..........................1
2.0 IDENTIFICATION OF SYSTEM .............................................1
3.0 SYSTEM DESCRIPTION AND FUNCTIONAL OPERATION ......................1
3.1 TEVES MARK 20 SYSTEM DESCRIPTION ..............................1
3.2 TRACTION CONTROL SYSTEM (TCS) DESCRIPTION ....................1
3.3 ADJUSTABLE PEDALS SYSTEM DESCRIPTION .........................2
3.4 SYSTEM COMPONENTS.............................................2
3.4.1 ABS AND BRAKE WARNING INDICATORS......................2
3.4.2 CONTROLLER ANTILOCK BRAKE (CAB) .......................3
3.4.3 HYDRAULIC CONTROL UNIT .................................3
3.4.4 ABS SWITCHES/SENSORS...................................3
3.4.5 ABS INITIALIZATION ........................................4
3.4.6 ABS DIAGNOSTIC MODE ....................................4
3.4.7 TRACTION CONTROL OPERATION............................4
3.5 DIAGNOSTIC TROUBLE CODES ......................................5
3.6 DRBIIIT ERROR MESSAGES AND BLANK SCREEN ......................5
3.6.1 DRBIIIT DOES NOT POWER UP...............................5
3.6.2 DISPLAY IS NOT VISIBLE....................................5
4.0 DISCLAIMERS, SAFETY, WARNINGS .......................................5
4.1 DISCLAIMERS......................................................5
4.2 SAFETY...........................................................5
4.2.1 TECHNICIAN SAFETY INFORMATION
4.3 WARNINGS ........................................................6
4.4 DIAGNOSIS........................................................6
5.0 REQUIRED TOOLS AND EQUIPMENT ......................................7
6.0 GLOSSARY OF TERMS...................................................7
7.0 DIAGNOSTIC INFORMATION AND PROCEDURES ............................9
ADJUSTABLE PEDALS
BCM WAKE UP RESPONSE FAILURE......................................10
BROKEN CABLE........................................................10
ECU FAILURE..........................................................10
EE PROM WRITE/READ FAILURE .........................................10
HALL FEED BACK OPEN.................................................10
HALL FEED BACK SHORT TO BATTERY ...................................10
HALL FEEDBACK SHORT TO GROUND ....................................10
HALL HIGH FREQUENCY FAILURE ........................................10
4.2.2 VEHICLE PREPARATION FOR TESTING........................6
4.2.3 SERVICING SUB-ASSEMBLIES ...............................6
4.2.4 DRBIIIT SAFETY INFORMATION ..............................6
4.3.1 VEHICLE DAMAGE WARNINGS ...............................6
4.3.2 ROAD TESTING A COMPLAINT VEHICLE.......................6
..........................................................5
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HALL MECHANICAL FAILURE.............................................10
INTERNAL START UP FAILURE ...........................................10
INTERNAL WAKE UP FAILURE............................................10
LOOP BACK FAILURE ...................................................10
MOTOR ARMATURE OPEN...............................................10
MOTOR ARMATURE SHORT TO BATTERY..................................10
MOTOR CONTROL INPUT FAULT .........................................10
MOTOR OUTPUT SHORT TO BATTERY ....................................10
MOTOR OUTPUT SHORT TO GROUND ....................................10
MOTOR THERMAL FAULT................................................10
PEDAL SENSOR REVERSE FAILURE ......................................10
RAM CHECK FAILURE...................................................10
ROM CHECK FAILURE ..................................................10
THERMAL PROTECTION OPEN...........................................10
BUSHIGH.............................................................14
BUS INTEGRITY FAILURE................................................15
NO COMMUNICATION WITH BCM .........................................15
NO COMMUNICATION WITH EATX ........................................15
NO COMMUNICATION WITH FCM .........................................15
NO COMMUNICATION WITH SBEC ........................................15
BUSLOW.............................................................17
IOD OVER VOLTAGE....................................................18
IOD UNDER VOLTAGE...................................................18
IOD UNDER VOLTAGE PLAUSIBILITY ......................................18
LINEAR SENSOR FEEDBACK OPEN.......................................20
LINEAR SENSOR FEEDBACK SHORT TO BATTERY..........................20
LINEAR SENSOR SUPPLY SHORT TO BATTERY ............................20
LINEAR SENSOR SUPPLY SHORT TO GROUND ............................20
MEMORY 1 FAILURE ....................................................22
MEMORY 2 FAILURE ....................................................22
MEMORY 3 FAILURE ....................................................22
MEMORY 4 FAILURE ....................................................22
*CAN’T SET/RECALL MEMORY POSITION ..................................22
PEDAL SWITCH OPEN ..................................................24
PEDAL SWITCH SHORTED...............................................26
PEDAL SWITCH STUCK FORWARD .......................................28
PEDAL SWITCH STUCK REARWARD ......................................29
*CAN’T ADJUST PEDALS ................................................30
TABLE OF CONTENTS - Continued
BRAKES (CAB)
BUS SYSTEM COMMUNICATION FAILURE .................................32
CAB INTERNAL FAILURE ................................................33
CLUSTER LAMP FAILURE................................................34
LEFT FRONT SENSOR CIRCUIT FAILURE ..................................36
LEFT REAR SENSOR CIRCUIT FAILURE ...................................36
RIGHT FRONT SENSOR CIRCUIT FAILURE.................................36
RIGHT REAR SENSOR CIRCUIT FAILURE ..................................36
LEFT FRONT WHEEL SPEED SIGNAL FAILURE .............................39
LEFT REAR WHEEL SPEED SIGNAL FAILURE ..............................41
PUMP CIRCUIT FAILURE ................................................43
RIGHT FRONT WHEEL SPEED SIGNAL FAILURE............................46
RIGHT REAR WHEEL SPEED SIGNAL FAILURE .............................48
SYSTEM OVERVOLTAGE ................................................50
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TABLE OF CONTENTS - Continued
SYSTEM UNDERVOLTAGE ...............................................52
VALVE POWER FEED FAILURE ...........................................54
*BRAKE LAMP SWITCH..................................................57
*TRAC OFF INDICATOR NEVER/ALWAYS ON ...............................58
*TRAC ON INDICATOR NEVER/ALWAYS ON ................................61
VERIFICATION TESTS
VERIFICATION TESTS...................................................62
8.0 COMPONENT LOCATIONS...............................................63
8.1 CONTROLLER ANTILOCK BRAKE (CAB) ..............................63
8.2 DATA LINK CONNECTOR ...........................................63
8.3 FUSES...........................................................64
8.4 TRACTION CONTROL SWITCH ......................................64
8.4.1 TRACTION CONTROL INDICATORS ..........................65
8.5 WHEEL SPEED SENSORS ..........................................65
8.5.1 FRONT...................................................65
8.5.2 REAR....................................................66
8.5A WHEEL SPEED SENSOR CONNECTORS..............................66
8.5A.1 FRONT...................................................66
8.5A.2 REAR....................................................67
8.6 BRAKE LAMP SWITCH .............................................67
8.7 ADJUSTABLE PEDALS SWITCH......................................67
8.8 ADJUSTABLE PEDALS MODULE .....................................68
8.9 ADJUSTABLE PEDALS SENSOR .....................................68
8.10 ADJUSTABLE PEDALS SWITCH CONNECTOR .........................68
9.0 CONNECTOR PINOUTS .................................................69
ADJUSTABLE PEDALS MODULE (EXCEPT BUILT-UP-EXPORT) - DK. GRAY 8
10.0 SCHEMATIC DIAGRAMS.................................................73
WAY..................................................................69
ADJUSTABLE PEDALS SWITCH (EXCEPT BUILT-UP-EXPORT) - WHITE 2 WAY. . .69
CONTROLLER ANTILOCK BRAKE - BLACK 24 WAY ..........................69
LEFT FRONT WHEEL SPEED SENSOR - GRAY 2 WAY .......................70
LEFT REAR WHEEL SPEED SENSOR - BLACK 2 WAY........................70
PUMP MOTOR CONNECTOR.............................................70
RIGHT FRONT WHEEL SPEED SENSOR - GRAY 2 WAY ......................70
RIGHT REAR WHEEL SPEED SENSOR - BLACK 2 WAY ......................71
TRACTION CONTROL SWITCH - BLACK 2 WAY .............................71
10.1 TEVES MARK 20 ANTILOCK BRAKE SYSTEM ..........................73
10.2 ADJUSTABLE PEDALS SYSTEM .....................................74
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NOTES
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GENERAL INFORMATION
1.0 INTRODUCTION
The procedures contained in this manual include
all the specifications, instructions, and graphics
needed to diagnose the Mark 20 Antilock Braking
System (ABS), Mark 20 Antilock Braking System
with Traction Control and the Adjustable Pedals
System. The diagnostics in this manual are based
on the failure condition or symptom being present
at time of diagnosis.
Please follow the recommendations below when
choosing your diagnostic path.
1. First make sure the DRBIIIt is communicating
with the CAB. If the DRBIIIt displays a “No
Response” condition, you must diagnose that
first.
2. Read DTC’s (diagnostic trouble codes) with the
DRBIIIt.
3. If no DTC’s are present, identify the customer
complaint.
4. Once the DTC or customer complaint is identi-
fied, locate the matching test in the Table of
Contents and begin to diagnose the symptom.
All component location views are in Section 8.0.
All connector pinouts are in Section 9.0. All schematics are in Section 10.0.
An asterisk (*) placed before the symptom description indicates a concern with no associated
DTC.
When repairs are required, refer to the appropriate service manual for the proper removal and
repair procedure.
Diagnostic procedures change every year. New
diagnostic systems may be added; carry over systems may be enhanced. READ THIS MANUAL
BEFORE TRYING TO DIAGNOSE A VEHICLE
CODE. It is recommended that you review the
entire manual to become familiar with all new and
changed diagnostic procedures.
After using this book, if you have any comments
or recommendations, please fill out the form at the
back of the book and mail it back to us.
• verification of complaint
• verification of any related symptoms
• symptom analysis
• problem isolation
• repair of isolated problem
• verification of proper operation
2.0 IDENTIFICATION OF SYSTEM
Vehicles equipped with the Teves Mark 20 antilock brake system can be identified by the presence of the controller antilock brake module located
beneath the master cylinder.
The presence of the Traction Control system is
indicated by the TRAC OFF switch on top of the
steering column shroud.
The presence of the Adjustable Pedals system is
indicated by the Adjustable Pedals switch on the
left side of the steering column.
3.0 SYSTEM DESCRIPTION AND
FUNCTIONAL OPERATION
3.1 TEVES MARK 20 SYSTEM
DESCRIPTION
The controller antilock brake module is used to
monitor wheel speeds and to modulate (control)
hydraulic pressure in each brake channel. The
modulated hydraulic pressure is used to prevent
wheel lock-up during braking.
The Teves Mark 20 system uses a diagonal split
hydraulic brake system. In the standard brake
mode the master cylinder primary circuit supplies
pressure to the right front and left rear wheel
brakes, and the secondary master cylinder circuit
supplies pressure to the left front and right rear
wheel brakes.
1.1 SYSTEM COVERAGE
This diagnostic procedure manual covers the antilock braking system (ABS), the traction control
system and the adjustable pedals system found on:
2002 Chrysler Town and Country, Dodge Caravan
and Grand Caravan.
1.2 SIX-STEP TROUBLESHOOTING
PROCEDURE
Diagnosis of the controller antilock brake module
is done in six basic steps:
3.2 TRACTION CONTROL SYSTEM (TCS) DESCRIPTION
The main purpose of traction control is to reduce
wheel slip and maintain traction at the driven
wheels when road surfaces are slippery. The traction control system reduces wheel slip by braking
the wheel that is losing traction. The system is
designed to operate at speeds below 56 km/h (35
mph).
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GENERAL INFORMATION
3.3 ADJUSTABLE PEDALS SYSTEM DESCRIPTION
General
The Adjustable Pedals System (APS) is designed
to enable the fore and aft repositioning of the brake
and accelerator pedals. This results in improved
ergonomics in relation to the steering wheel for
taller and shorter drivers. Being able to adjust the
pedal positions also allows the driver to set steering
wheel tilt and seat position to the most comfortable
position. The effort required for pedal application
will not change regardless of pedal position.
Change of pedal position is accomplished by
means of a motor driven screw. Operating the
adjustable pedal switch activates the pedal drive
motor. The pedal drive motor turns a screw that
changes the position of the accelerator pedal. The
motor also drives a cable connected to a gear box
that changes the brake pedal position the same
distance as the accelerator pedal. The pedals can be
moved rearward (closer to the driver) or forward
(away from driver). Each pedal is moved on its
activating lever to a position where the driver feels
most comfortable. The position and operation of the
activating levers are not changed.
Neither the pedal drive motor nor drive mechanism are subject to the mechanical stress of brake
or accelerator application.
System Features:
• Range of Adjustment
The pedals may be adjusted up to approximately
3 in. (75 mm)
• Pedal Adjustment Speed
0.4 in./sec (9 mm/sec)
• Pedal Adjustment Inhibitors
Pedal adjustment is inhibited when the vehicle is
in reverse or when cruise control is engaged.
• Memory
An optional memory feature is available. This
allows storing of one or two preferred pedal
positions in the Adjustable Pedal Module (APM).
A preferred position can be stored and recalled
using the door-mounted switches. A stored pedal
position can be recalled (but not stored) using the
Remote Keyless Entry (RKE) if equipped with the
memory feature.
• Adjustable Pedal Feedback Message
The Electronic Vehicle Information Center
(EVIC) will display a message when the APS is
disabled. i.e.: 9Adjustable Pedal Disabled - Cruise
Control Engaged9 or 9Adjustable Pedal Disabled Vehicle in Reverse9.
• Damage Prevention
Foot pressure or debris can stall pedal adjustment. In order to avoid damage to system compo-
nents during pedal adjustment, the APM will
monitor pedal position sensor voltage. If theAPM
does not detect expected voltage change within 3
seconds, it will cut power to the adjustable pedal
motor.
3.4 SYSTEM COMPONENTS
ABS
• controller antilock brake (CAB)
• vacuum booster
• master cylinder
• ABS integrated electronic control module/
hydraulic control unit (HCU), valve block assembly: 8 valve solenoids (4 inlet valves, 4 outlet
valves, 2 accumulators) 1 pump.
• 4 wheel speed sensor/tone wheel assemblies
• ABS warning indicator
• fuses and wiring harness
• fluid reservoir
ABS With Traction Control
• CAB with Traction Control programming
• HCU with two additional control valves.
• TRAC ON/OFF Switch
• TRAC/TRAC OFF indicators
Adjustable Pedals System
• Adjustable Pedals Switch
• Adjustable Pedals Position Sensor
• Adjustable Pedals Module/Pedal Assembly
3.4.1 ABS AND BRAKE WARNING INDICATORS
The amber ABS warning indicator is located in
the instrument cluster. It is used to inform the
driver that the antilock function has been turned
off. The ABS warning indicator is controlled by the
CAB. The CAB controls the lamp with a command
over the PCI bus.
TheABS WarningIndicator will remain lit during
every key cycle until a circuit or component fault is
repaired and the CAB no longer detects the fault.
After repair of a sensor signal fault or a pump motor
fault, the CAB must sense all four wheels at 25
km/h (15 mph) before it will extinguish the ABS and
TRAC OFF Indicators.
The Instrument Cluster will illuminate the ABS
Warning Indicator if it loses communication with
the CAB.
The red BRAKE warning indicator is also located
in the instrument cluster. It can be activated in
several ways. Application of the parking brake or a
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GENERAL INFORMATION
low fluid signal from the fluid level switch located in
the master cylinder reservoir will cause the indicator to come on.
3.4.2 CONTROLLER ANTILOCK BRAKE (CAB)
The Controller Antilock Brake (CAB) is a
microprocessor-based device that monitors wheel
speeds and controls the antilock functions. The
CAB contains two microprocessors that receive
identical sensor signals and then independently
process the information. The results are then compared to make sure that they agree. Otherwise, the
CAB will turn off the antilock and turn on the ABS
amber warning indicator.
The primary functions of the CAB are to:
• detect wheel locking tendencies
• control fluid pressure modulation to the brakes
during antilock stop
• monitor the system for proper operation
• manage traction control functions
• provide communication to the DRBIIIt while in
diagnostic mode
•
store diagnostic information in non-volatile memory
The CAB continuously monitors the speed of each
wheel. When a wheel locking tendency is detected,
the CAB will command the appropriate valve to
modulate brake fluid pressure in its hydraulic unit.
Brake pedal position is maintained during an antilock stop by being a closed system with the use of
2 accumulators. The CAB continues to control pres-
sure in individual hydraulic circuits until a wheel
locking tendency is no longer present. The CAB
turns on the pump motor during an antilock stop.
The antilock brake system is constantly monitored by the CAB for proper operation. If the CAB
detects a system malfunction, it can disable the
antilock system and turn on the ABS warning
indicator. If the antilock function is disabled, the
system will revert to standard base brake system
operation.
The CAB inputs include the following:
• diagnostic communication
• four wheel speed sensors
• three power feeds: valves, pump and microproces-
sor
• brake switch
• traction control switch
The CAB outputs include the following:
• ABS warning indicator actuation
• 12 volts power to wheel speed sensors
• eight valves
• ten valves with traction control
• diagnostic communication
• PCI bus communication
• traction control lamp illumination
3.4.3 HYDRAULIC CONTROL UNIT
The hydraulic control unit (HCU) contains the
valve block assembly, two accumulators, and pump/
motor assembly. The HCU is attached to the CAB.
Valve Block Assembly: The valve block assembly contains valves with four inlet valves and four
outlet valves. The inlet valves are spring-loaded in
the open position and the outlet valves are spring
loaded in the closed position. During an antilock
stop, these valves are cycled to maintain the proper
slip ratio for each wheel. If a wheel detects slip, the
inlet valve is closed to prevent and further pressure
increase. Then the outlet valve is opened to release
the pressure to the accumulators until the wheel is
no longer slipping. Once the wheel is no longer
slipping, the outlet valve is closed and the inlet
valve is opened to reapply pressure. If the wheel is
decelerating within its predetermined limits (proper slip ratio), the inlet valve will close to hold the
pressure constant. On vehicles which are equipped
with a traction control system, there are two additional valves that isolate the master cylinder and
rear wheels. During a traction control event the
brakes are applied to reduce wheel slippage.
Pump Motor Assembly: The pump motor assembly provides the extra amount of fluid needed
during antilock braking. The pump is supplied fluid
that is released to the accumulators when the outlet
valve is opened during an antilock stop. The pump
is also used to drain the accumulator circuits after
the antilock stop is complete. The pump is operated
by an integral electric motor. This motor is controlled by the CAB. The CAB may turn on the pump
motor when an antilock stop is detected. The pump
continues to run during the antilock stop and is
turned off after the stop is complete. Under some
conditions, the pump motor will run to drain the
accumulators during the next drive off. The CAB
monitors the pump motor operation internally.
Accumulators: The accumulators provide temporary fluid storage during an antilock stop and are
drained by the pump motor.
3.4.4 ABS SWITCHES/SENSORS
Master Cylinder: The master cylinder is a standard tandem compensating port design for ABS and
non ABS systems. Traction control vehicles use a
dual center port master cylinder. For proper traction control operation the standard master cylinder
must not be used.
A fluid level switch is located in the master
cylinder fluid reservoir. The switch closes when a
low fluid level is detected. The fluid level switch
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GENERAL INFORMATION
turns on the brake warning indicator by grounding
the indicator circuit. This switch does not disable
the ABS system.
Wheel Speed Sensors and Tone Wheels: One
active wheel speed sensor (WSS) is located at each
wheel and sends a small signal to the control
module (CAB). This signal is generated when a
toothed sensor ring (tone wheel) passes by a stationary wheel speed sensor. The CAB converts the
signals into digital signals for each wheel.
Because of internal circuitry, correct wheel speed
sensor function cannot be determined by a continuity or resistance check through the sensor.
The front wheel speed sensor is attached to a boss
in the steering knuckle. The tone wheel is an
integral part of the front axle shaft. The rear speed
sensor is mounted though the bearing cover and the
rear tone wheel is an integral part of the rear
bearing hub. The wheel speed sensor air gap is not
adjustable. Refer to the service manual for wheel
speed sensor air gap and resistance specifications.
The four wheel speed sensors are serviced individually. The front tone wheels are serviced as an
assembly with the outer constant velocity (C.V.)
joint housing. The rear tone wheels are serviced as
an assembly.
Correct antilock system operation is dependent
on tone wheel speed signals from the wheel speed
sensors. The vehicle’s wheels and tires should all be
the same size and type to generate accurate signals.
In addition, the tires should be inflated to the
recommended pressure for optimum system operation. Variation in wheel and tire size or significant
variations in inflation pressure can produce inaccu-
rate wheel speed signals; however, the system will
continue to function when using the mini-spare.
3.4.5 ABS INITIALIZATION
System initialization starts when the key is
turned to “run”. At this point, the CAB performs a
complete self-check of all electrical components in
the antilock systems.
Between 8-17 km/h (5-10 mph), a dynamic test is
performed. This will momentarily cycle the inlet
and outlet valves, check wheel speed sensor circuitry, and run the pump motor at 25 km/h (15
mph). The CAB will try to test the pump motor. If
the brake pedal is applied the test will be run at 40
km/h (24 mph) regardless of brake switch state. If,
during the dynamic test, the brake pedal is applied,
the driver may feel the test through brake pedal
pulsations. This is a normal condition.
If any component exhibits a trouble condition
during system initialization or dynamic check, the
CAB will illuminate the ABS warning indicator and
TRAC OFF lamp if equipped.
3.4.6 ABS DIAGNOSTIC MODE
To enter diagnostic mode, a vehicle speed must be
below 10 km/h (6 mph) and no ABS condition
present. If vehicle speed is not below 10 km/h
(6 mph), a “No Response” message could be displayed by the DRBIIIt. The following are characteristics of diagnostic mode:
– The amber ABS warning indicator will blink
rapidly (about 1/2 second ON and 1/2 second
OFF). If a hard trouble code, such as Valve
Power Feed Failure code is present, the indicator will be illuminated without blinking un-
til the trouble condition is cleared.
– Antilock operation is disabled.
– The HCU valves cannot be actuated when the
vehicle speed is above 8 km/h (5 mph). If valve
actuation is attempted above 8 km/h (5 mph), a
“No Response” message will be displayed on
the DRBIIIt.
3.4.7 TRACTION CONTROL OPERATION
The Controller Antilock Brake (CAB) monitors
wheel speeds. If, during acceleration, the module
detects front (drive) wheel slip and the brakes are
not applied, the CAB will enter traction control
mode. Traction control works in the following order
when drive wheel slip is detected.
1. Close the (normally open) isolation valves.
2. Start pump/motor and supply volume/pressure
to front hydraulic circuits (pump runs continuously during traction control).
3. Open and close build and decay valves to main-
tain minimum wheel slip and maximum traction.
The cycling of the build and decay valves is
similar to the ABS except that they work to control
wheel spin by applying brakes. ABS function is to
control wheel skid by releasing brakes.
Two pressure relief valves allow excess fluid volume to return to the reservoir when not used by the
build/decay cycles. These are required because the
pump supplies more volume than the traction control system requires.
If at any time the brake pedal is applied during a
traction control cycle, the brake lamp switch will
trigger the CAB to switch off the traction control.
The traction control system will be enabled at
each ignition cycle. It may be turned off by depressing the Traction Control Switch. The traction control system function lamp will illuminate “TRAC
OFF” immediately upon depressing the traction
control switch button. Only the “TRAC” portion of
the “TRAC OFF” indicator will illuminate during a
traction control event.
If the CAB calculates that the brake temperatures are high, the traction control system will
4
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become inoperative until a time-out period has
elapsed. When in this thermal protection mode, the
traction control “TRAC OFF” lamp will illuminate;
however, a fault will not be registered.
3.5 DIAGNOSTIC TROUBLE CODES
The Controller Antilock Brake may report any of
several Diagnostic Trouble Codes (DTC)s. For a list
of the DTCs diagnosed in this manual, refer to the
Table of Contents.
3.6 DRBIIIT ERROR MESSAGES AND
BLANK SCREEN
Under normal operation, the DRBIIIt will display one of only two error messages:
– User-Requested WARM Boot or User-
Requested COLD Boot.
If the DRBIIIt should display any other error
message, record the entire display and call the
STAR Center. This is a sample of such an error
message display:
ver: 2.14
date: 26 Jul93
file: key_itf.cc
date: Jul 26 1993
line: 548
err. 0x1
User-Requested COLD boot Press MORE to
switch between this display
and the application screen.
Press F4 when done noting information.
GENERAL INFORMATION
4.0 DISCLAIMERS, SAFETY, WARNINGS
4.1 DISCLAIMERS
All information, illustrations, and specifications
contained in this manual are based on the latest
information available at the time of publication.
The right is reserved to make changes at any time
without notice.
4.2 SAFETY
4.2.1 TECHNICIAN SAFETY INFORMATION
3.6.1 DRBIIIT DOES NOT POWER UP
If the LED’s do not light orno sound is emitted at
start up, check for loose cable connections or a bad
cable. Check the vehicle battery voltage (data link
connector cavity 16). A minimum of 11 volts is
required to adequately power the DRBIIIt.
If all connections are proper and the vehicle
battery is fully charged, an inoperative DRBIIIt
may be the result of faulty cable or vehicle wiring.
3.6.2 DISPLAY IS NOT VISIBLE
Low temperatures will affect the visibility of the
display. Adjust the contrast to compensate for this
condition.
WARNING: ENGINES PRODUCE CARBON
MONOXIDE THAT IS ODORLESS, CAUSES
SLOWER REACTION TIME, AND CAN LEAD
TO SERIOUS INJURY. WHEN THE ENGINE IS
OPERATING, KEEP SERVICE AREAS WELL
VENTILATED OR ATTACH THE VEHICLE
EXHAUST SYSTEM TO THE SHOP EXHAUST
REMOVAL SYSTEM.
Set the parking brake and block the wheels before
testing or repairing the vehicle. It is especially
important to block the wheels on front-wheel drive
vehicles; the parking brake does not hold the drive
wheels.
When servicing a vehicle, always wear eye protection, and remove any metal jewelry such as
rings, watchbands or bracelets that might make an
inadvertent electrical contact.
When diagnosing a chassis problem, it is important to follow approved procedures where applicable. These procedures can be found in the service
manual. Following these procedures is very important to the safety of individuals performing diagnostic tests.
5
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GENERAL INFORMATION
4.2.2 VEHICLE PREPARATION FOR TESTING
Make sure the vehicle being tested has a fully
charged battery.If is does not, false diagnostic codes
or error messages may occur.
4.2.3 SERVICING SUB-ASSEMBLIES
Some components of the chassis system are intended to be serviced as an assembly only. Attempting to remove or repair certain system subcomponents may result in personal injury and/or
improper system operation. Only those components
with approved repair and installation procedures in
the service manual should be serviced.
4.2.4 DRBIIIT SAFETY INFORMATION
WARNING: EXCEEDING THE LIMITS OF THE
DRBIIIT MULTIMETER IS DANGEROUS. IT
CAN EXPOSE YOU TO SERIOUS OR
POSSIBLY FATAL INJURY. CAREFULLY
READ AND UNDERSTAND THE CAUTIONS
AND THE SPECIFICATION LIMITS.
• Follow the vehicle manufacturer’s service speci-
fications at all times.
• Do not use the DRBIIIt if it has been damaged.
• Do not use the test leads if the insulation is
damaged or if metal is exposed.
• To avoid electrical shock, do not touch the test
leads, tips, or the circuit being tested.
• Choose the proper range and functions for the
measurement. Do not try voltage or current measurements that may exceed the rated capacity.
• Do not exceed the limits shown in the table below:
FUNCTION INPUT LIMIT
Volts 0 - 500 peak volts AC
0 - 500 volts DC
• Use the low current shunt to measure circuits up
to 10A. Use the high current clamp to measure
circuits exceeding 10A.
• When testing for the presence of voltage or cur-
rent, make sure the meter is functioning correctly. Take a reading of a known voltage or
current before accepting a zero reading.
• When measuring current, connect the meter in
series with the load.
• Disconnect the live test lead before disconnecting
the common test lead.
• When using the meter function, keep the
DRBIIIt away from spark plug or coil wires to
avoid measuring error from outside interference.
4.3 WARNINGS
4.3.1 VEHICLE DAMAGE WARNINGS
Before disconnecting any control module, make
sure the ignition is ‘‘off’’. Failure to do so could
damage the module.
When testing voltage or continuity at any control
module, use the terminal side (not the wire end) of
the connector. Do not probe a wire through the
insulation, this will damage it and eventually cause
it to fail because of corrosion.
Be careful when performing electrical tests so as
to prevent accidental shorting of terminals. Such
mistakes can damage fuses or components. Also, a
second code could be set, making diagnosis of the
original problem more difficult.
4.3.2 ROAD TESTING A COMPLAINT
VEHICLE
Some complaints will require a test drive as part
of the repair verification procedure. The purpose of
the test drive is to try to duplicate the diagnostic
code or symptom condition.
Ohms (resistance)* 0 -1.12 megohms
Frequency Measured
Frequency Generated
Temperature -58 - 1100°F
* Ohms cannot be measured if voltage is present.
Ohms can be measured only in a non-powered
circuit.
• Voltage between any terminal and ground must
not exceed 500v DC or 500v peak AC.
• Use caution when measuring voltage above 25v
DC or 25v AC.
0-10kHz
-50 - 600°C
WARNING: BEFORE ROAD TESTING A
VEHICLE, BE SURE THAT ALL
COMPONENTS ARE REASSEMBLED.
DURING THE TEST DRIVE, DO NOT TRY TO
READ THE DRB SCREEN WHILE IN MOTION.
DO NOT HANG THE DRBIIIT FROM THE
REAR VIEW MIRROR OR OPERATE IT
YOURSELF. HAVE AN ASSISTANT
AVAILABLE TO OPERATE THE DRBIIIT.
4.4 DIAGNOSIS
1. Your diagnostic test procedure must begin with a
thorough visual inspection of the system in question for damaged components or disconnected
6
Page 11
GENERAL INFORMATION
connectors. For ABS the brake lamps must be
operational prior to continuing.
2. Connect the DRBIIIt to the data link connector,
which is located under the dash to the left of the
steering column. If the DRBIIIt does not power
up, check the power and ground supplies to the
connector.
3. Turn the ignition on. Select the system in question. If the DRBIIIt displays “No Response”
condition you must diagnose that first.
4. Read and record all diagnostic trouble codes. For
ABS if the “CAB Power Feed Circuit” diagnostic
trouble code is present, it must be repaired prior
to addressing any other DTC’s. If any additional
DTC’s are present, proceed to the appropriate
test by locating the matching test in the Table of
Contents and begin to diagnose the symptom.
5. For ABS if there are no diagnostic trouble codes
present, identify the customer complaint. Select
“Inputs/Outputs” and read the brake switch input as you press and release the brake pedal. If
the display does not match the state of the pedal,
perform the proper test by locating the matching
test in the Table of Contents and begin to diagnose the symptom. If a problem exists with the
yellow “ABS” warning indicator or the red
“Brake” indicator exists, refer to the proper tests
by locating the matching test in the Table of
Contents and begin to diagnose the symptom.
Read the traction control switch input as you
press and release the switch. If the display does
not match the state of the indicator perform the
proper test by locating the matching test in the
Table of Contents and begin to diagnose the
symptom.
6. If no other problems are found, it will be necessary to road test the vehicle. Perform several
antilock stops from above 50 Km/h (30 mph) and
then repeat step 4. If any diagnostic trouble
codes are present, proceed to the appropriate
test.
7. The following conditions should be considered
“NORMAL” operation, and no repairs should be
attempted to correct them.
– Brake pedal feedback during an ABS stop
(clicking, vibrating).
– Clicking, groaning or buzzing at 25 Km/h (15
mph) or 40 Km/h (24 mph) (drive off self test).
– Groaning noise during an ABS stop.
– Slight brake pedal drop and pop noise when
ignition is initially turned on.
– Brake pedal ratcheting down at the end of an
ABS stop.
8. If the complaint is ABS “cycling” at the end of a
stop at low speeds, it may be caused by a
marginal wheel speed sensor signal. The sensor
air gap, tone wheel condition, and/or brakes
hanging up are possible causes of this condition.
9. After a road test in which no problems were
found, refer to any Technical Service Bulletins
that may apply.
5.0 REQUIRED TOOLS AND
EQUIPMENT
DRBIIIt (diagnostic read-out box)
jumper wires
ohmmeter
voltmeter
test light
6.0 GLOSSARY OF TERMS
ABS antilock brake system
APM adjustable pedals module
CAB controller antilock brake
DLC data link connector
DRB diagnostic read-out box
DTC diagnostic test code
HCU hydraulic control unit
ICU integrated control unit
JBLK junction block
PCI programmable communication inter-
face
PDC power distribution center
P/M pump motor
WSS wheel speed sensor
7
Page 12
NOTES
8
Page 13
DIAGNOSTIC INFORMATION AND
7.0
PROCEDURES
9
Page 14
ADJUSTABLE PEDALS
Symptom List:
BCM WAKE UP RESPONSE FAILURE
BROKEN CABLE
ECU FAILURE
EE PROM WRITE/READ FAILURE
HALL FEED BACK OPEN
HALL FEED BACK SHORT TO BATTERY
HALL FEEDBACK SHORT TO GROUND
HALL HIGH FREQUENCY FAILURE
HALL MECHANICAL FAILURE
INTERNAL START UP FAILURE
INTERNAL WAKE UP FAILURE
LOOP BACK FAILURE
MOTOR ARMATURE OPEN
MOTOR ARMATURE SHORT TO BATTERY
MOTOR CONTROL INPUT FAULT
MOTOR OUTPUT SHORT TO BATTERY
MOTOR OUTPUT SHORT TO GROUND
MOTOR THERMAL FAULT
PEDAL SENSOR REVERSE FAILURE
RAM CHECK FAILURE
ROM CHECK FAILURE
THERMAL PROTECTION OPEN
The title for the tests will be BCM WAKE UP RESPONSE
FAILURE.
When Monitored and Set Condition:
BCM WAKE UP RESPONSE FAILURE
When Monitored: When Adjustable Pedals Module is awakened.
Set Condition: When the module fails to receive a response from the BCM.
BROKEN CABLE
When Monitored: Key ON.
Set Condition: When the module detects lower than expected motor current draw.
ECU FAILURE
When Monitored: When the Adjustable Pedals module enters the Sleep State.
Set Condition: When the module fails a self-test.
Test Note: All symptoms listed above are diagnosed using the same tests.
10
Page 15
ADJUSTABLE PEDALS
BCM WAKE UP RESPONSE FAILURE — Continued
EE PROM WRITE/READ FAILURE
When Monitored: During a module Write function.
Set Condition: When the module self-test detects an incorrect Read after a Write.
HALL FEED BACK OPEN
When Monitored: When the Adjustable pedals module is awake.
Set Condition: When the module detects a Hall Sensor circuit fault. (Voltage between 2.4
- 3.2 V)
HALL FEED BACK SHORT TO BATTERY
When Monitored: When the Adjustable Pedals module is awake.
Set Condition: When theAdjustable Pedals module detects a Hall Sensor feedback circuit
voltage greater than 4.55 V.
HALL FEEDBACK SHORT TO GROUND
When Monitored: When the Adjustable Pedals module is awake.
Set Condition: When the module detects a Hall Sensor feedback circuit voltage is less
than 0.1 V.
HALL HIGH FREQUENCY FAILURE
When Monitored: Anytime motion takes place.
Set Condition: When the module detects a Hall Sensor circuit fault. (More than 3
counts/49 ms.)
HALL MECHANICAL FAILURE
When Monitored: Anytime motion takes place.
Set Condition: When the module detects a Hall Sensor circuit fault. (Less than 2 counts
in 497 ms.)
INTERNAL START UP FAILURE
When Monitored: Key ON.
Set Condition: When the module self test detects an internal fault.
INTERNAL WAKE UP FAILURE
When Monitored: At module wake up.
Set Condition: When the module self test detects an internal fault.
LOOP BACK FAILURE
When Monitored: When theAdjustable Pedals module is unable to transmit messages or
prior to log in missing messages.
Set Condition: When the Adjustable Pedals module detects an internal fault.
11
Page 16
ADJUSTABLE PEDALS
BCM WAKE UP RESPONSE FAILURE — Continued
MOTOR ARMATURE OPEN
When Monitored: Anytime the Adjustable Pedals module is awake.
Set Condition: When the module detects a fault in the motor armature circuit.
MOTOR ARMATURE SHORT TO BATTERY
When Monitored: Anytime the Adjustable Pedals module is awake.
Set Condition: When the module detects a fault in the motor circuitry
MOTOR CONTROL INPUT FAULT
When Monitored: Anytime pedal motion takes place..
Set Condition: When the module detects a fault in the motor driver circuitry
MOTOR OUTPUT SHORT TO BATTERY
When Monitored: Anytime the Adjustable Pedals module is awake.
Set Condition: When the module detects a fault in the motor circuitry
MOTOR OUTPUT SHORT TO GROUND
When Monitored: Anytime the Adjustable Pedals module is awake.
Set Condition: When the module detects a fault in the motor circuitry
MOTOR THERMAL FAULT
When Monitored: Key ON.
Set Condition: When the module detects a fault in the motor circuitry
PEDAL SENSOR REVERSE FAILURE
When Monitored: Anytime pedal motion takes place.
Set Condition: When the module detects a Pedal Sensor Reverse circuit failure.
RAM CHECK FAILURE
When Monitored: Anytime the Adjustable Pedals module is awake.
Set Condition: When the module self test detects a RAM failure.
ROM CHECK FAILURE
When Monitored: Anytime the Adjustable Pedals module is awake.
Set Condition: When the module self test detects a ROM failure.
THERMAL PROTECTION OPEN
When Monitored: Key ON. Within 1 second of time motor stops functioning.
Set Condition: When the module self test detects an internal thermal protection sensor
open (triggered).
12
Page 17
ADJUSTABLE PEDALS
BCM WAKE UP RESPONSE FAILURE — Continued
POSSIBLE CAUSES
ACTIVE DTC PRESENT
ADJUSTABLE PEDALS MODULE INTERNAL FAULT
INTERMITTENT DTC
TEST ACTION APPLICABILITY
1 With the DRBIIIt, record and erase DTC’s.
With the DRBIIIt, read DTCs.
Does the DRBIIIt display any additional DTCs? Does the DRBIIIt display the
original DTC?
Yes → Replaceand program the Adjustable Pedals Module in accordance
with the Service Information.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
All
No → Go To 2
2 Turn the ignition off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
Yes → Repair as necessary.
No → Test Complete.
All
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
13
Page 18
ADJUSTABLE PEDALS
Symptom:
BUS HIGH
When Monitored and Set Condition:
BUS HIGH
When Monitored: When the Adjustable Pedals module is awake.
Set Condition: When the module detects the bus shorted to voltage.
POSSIBLE CAUSES
ADJUSTABLE PEDALS MODULE INTERNAL FAULT
INTERMITTENT DTC
TEST ACTION APPLICABILITY
1 NOTE: That the module can be queried indicates the bus is OK and an active
DTC is false.
With the DRBIIIt, erase DTCs.
With the DRBIIIt, read DTCs.
Does the DRBIIIt display the DTC as active?
All
Yes → Replaceand program the Adjustable Pedals Module in accordance
No → Go To 2
2 Turn the ignition off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
Yes → Repair as necessary.
No → Test Complete.
with the Service Information.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
All
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
14
Page 19
ADJUSTABLE PEDALS
Symptom List:
BUS INTEGRITY FAILURE
NO COMMUNICATION WITH BCM
NO COMMUNICATION WITH EATX
NO COMMUNICATION WITH FCM
NO COMMUNICATION WITH SBEC
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be BUS INTEGRITY FAILURE.
When Monitored and Set Condition:
BUS INTEGRITY FAILURE
When Monitored: When the Adjustable Pedals module is awake.
Set Condition: When the module detects no bus communication.
NO COMMUNICATION WITH BCM
When Monitored: When the Adjustable Pedals module is awake and not doing diagnostics.
Set Condition: When the module detects no communication with the BCM.
NO COMMUNICATION WITH EATX
When Monitored: When the Adjustable Pedals module is awake and key position is
correct to receive messages.
Set Condition: When the module detects no communication with the EATX.
NO COMMUNICATION WITH FCM
When Monitored: When the Adjustable Pedals module is awake and the key position is
correct to receive messages.
Set Condition: When the module detects no communication with the FCM.
NO COMMUNICATION WITH SBEC
When Monitored: When the Adjustable Pedals module is awake and the key position is
correct to receive messages.
Set Condition: When the module detects no communication with the SBEC.
ACTIVE DTC PRESENT
INTERMITTENT DTC
POSSIBLE CAUSES
15
Page 20
ADJUSTABLE PEDALS
BUS INTEGRITY FAILURE — Continued
TEST ACTION APPLICABILITY
1 With the DRBIIIt, record and erase DTC’s.
With the DRBIIIt, read DTCs.
Does the DRBIIIt display the NO COMMUNICATION DTC as active?
Yes → Refer to symptom list for problems related to Communication.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
No → Go To 2
All
2 Turn the ignition off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
Yes → Repair as necessary.
No → Test Complete.
All
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
16
Page 21
ADJUSTABLE PEDALS
Symptom:
BUS LOW
When Monitored and Set Condition:
BUS LOW
When Monitored: Key ON.
Set Condition: When the module detects the bus shorted to ground.
POSSIBLE CAUSES
ADJUSTABLE PEDALS MODULE INTERNAL FAULT
INTERMITTENT DTC
TEST ACTION APPLICABILITY
1 NOTE: That the module can be queried indicates the bus is OK and an active
DTC is false.
With the DRBIIIt, record and erase DTC’s.
With the DRBIIIt, read DTCs.
Does the DRBIIIt display the DTC as active?
All
Yes → Replaceand program the Adjustable Pedals Module in accordance
No → Go To 2
2 Turn the ignition off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
Yes → Repair as necessary.
No → Test Complete.
with the Service Information.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
All
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
17
Page 22
ADJUSTABLE PEDALS
Symptom List:
IOD OVER VOLTAGE
IOD UNDER VOLTAGE
IOD UNDER VOLTAGE PLAUSIBILITY
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be IOD OVER VOLTAGE.
When Monitored and Set Condition:
IOD OVER VOLTAGE
When Monitored: Anytime the Adjustable Pedals Module is awake.
Set Condition: When the Adjustable Pedals Module detects vehicle voltage above 17.5 V
DC.
IOD UNDER VOLTAGE
When Monitored: Any time that the module is awake.
Set Condition: When the APM detects a Vehicle Battery Voltage less than 6.5 V DC for
200 ms.
IOD UNDER VOLTAGE PLAUSIBILITY
When Monitored: Whenever the module is awake
Set Condition: When theAPM detects a vehiclevoltage below 6.5 VDC for more than 200
milliseconds.
VEHICLE VOLTAGE LOW
IOD CIRCUIT HIGH RESISTANCE
APM -- IOD VOLTAGE LOW
VEHICLE VOLTAGE HIGH
APM -- IOD VOLTAGE HIGH
INTERMITTENT DTC
POSSIBLE CAUSES
18
Page 23
ADJUSTABLE PEDALS
IOD OVER VOLTAGE — Continued
TEST ACTION APPLICABILITY
1 With the DRBIIIt, record and erase DTC’s.
With the DRBIIIt, read DTCs.
Does the DRBIIIt display an IOD Voltage DTC?
Yes-IOD Undervoltage or IOD Plausability
Go To 2
Yes - IOD Overvoltage
Go To 4
No → Go To 5
All
2 With the DRBIIIt, read the vehicle voltage status.
Does the DRBIIIt display a vehicle voltage concern?
Yes → Refer to Charging information for the related symptom(s).
No → Go To 3
3 Disconnect the Adjustable Pedals Module harness connector.
Using a 12-volt test light connected to ground, check the IOD circuit.
Does the test light illuminate brightly?
Yes → Replaceand program the Adjustable Pedals Module in accordance
No → Repair the IOD circuit for an open or a short to ground. Refer to
4 With the DRBIIIt, read the vehicle voltage status.
Does the DRBIIIt display a vehicle voltage above 17.5 volts?
Yes → Refer to Charging information for the related symptom(s).
All
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
All
with the Service Information.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
the Wiring Diagrams for circuits common to the IOD fuse.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
All
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
No → Replace and program theAdjustable Pedals Module in accordance
with the Service Information.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
5 Turn the ignition off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
Yes → Repair as necessary.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
No → Test Complete.
19
All
Page 24
ADJUSTABLE PEDALS
Symptom List:
LINEAR SENSOR FEEDBACK OPEN
LINEAR SENSOR FEEDBACK SHORT TO BATTERY
LINEAR SENSOR SUPPLY SHORT TO BATTERY
LINEAR SENSOR SUPPLY SHORT TO GROUND
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be LINEAR SENSOR FEEDBACK
OPEN.
When Monitored and Set Condition:
LINEAR SENSOR FEEDBACK OPEN
When Monitored: Anytime the Adjustable Pedals Module is awake.
Set Condition: When the APM detects lessthan 0.3 V on the feedback circuit through the
pedal position sensor.
LINEAR SENSOR FEEDBACK SHORT TO BATTERY
When Monitored: Anytime the Adjustable Pedals Module is awake.
Set Condition: When the APM detects a short to battery greater than 4.7 V on the Pedal
Position Sensor Feedback circuit.
LINEAR SENSOR SUPPLY SHORT TO BATTERY
When Monitored: Anytime the Adjustable Pedals Module is awake.
PEDAL POSITION SENSOR - INTERNAL
ADJUSTABLE PEDALS MODULE- INTERNAL FAULT
Set Condition: When the APM detects a short to battery greater than 5.3 V on the Pedal
Position Sensor Supply circuit.
LINEAR SENSOR SUPPLY SHORT TO GROUND
When Monitored: Anytime the Adjustable Pedals Module is awake.
Set Condition: When the APM detects the Adjustable Pedals Sensor Supply circuit
voltage as less than 4.7 V.
POSSIBLE CAUSES
INTERMITTENT DTC
20
Page 25
ADJUSTABLE PEDALS
LINEAR SENSOR FEEDBACK OPEN — Continued
TEST ACTION APPLICABILITY
1 With the DRBIIIt, erase DTCs.
With the DRBIIIt, read DTCs.
Does the DRBIIIt display a Linear Sensor DTC?
Yes → Go To 2
No → Go To 3
All
2 Disconnect the Adjustable Pedals Module harness connector.
NOTE: The sum of the measurements must be between 4k and 6k ohms.
On the Pedal Position Sensor, measure the resistance from pin 1 to 2 and from 2 to
3.
Is the sum of the measurements within specification?
Yes → Replace the Adjustable Pedals Module.
No → Replace the Pedal Position Sensor.
3 Turn the ignition off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
Yes → Repair as necessary.
No → Test Complete.
All
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
All
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
21
Page 26
ADJUSTABLE PEDALS
Symptom List:
MEMORY 1 FAILURE
MEMORY 2 FAILURE
MEMORY 3 FAILURE
MEMORY 4 FAILURE
*CAN’T SET/RECALL MEMORY POSITION
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be MEMORY 1 FAILURE.
When Monitored and Set Condition:
MEMORY 1 FAILURE
When Monitored: When there is an attempt to set or recall a memory position.
Set Condition: When theAdjustable Pedals module fails an internal memory data check.
MEMORY 2 FAILURE
When Monitored:
Set Condition: .
ACTIVE DTC
APM - MEMORY FUNCTION
MEMORY SEAT MIRROR MODULE
TEST ACTION APPLICABILITY
1 With the DRBIIIt, record and erase DTC’s.
Wait 5 seconds and with the DRBIIIt, read DTC’s.
Does the DRBIIIt display any active Adjustable Pedals or Communication DTC?
Yes → Refer to symptom list for problems related to the displayed
No → Go To 2
POSSIBLE CAUSES
All
symptom(s).
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
22
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ADJUSTABLE PEDALS
MEMORY 1 FAILURE — Continued
TEST ACTION APPLICABILITY
2 Attempt to set and recall seat and mirror positions using the memory function.
Does the memory function work OK for the seats and mirrors?
Yes → Replaceand program the Adjustable Pedals Module in accordance
with the Service Information..
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
No → Replace and program the Memory Seat Mirror Module in accor-
dance with the Service Information.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
All
23
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ADJUSTABLE PEDALS
Symptom:
PEDAL SWITCH OPEN
When Monitored and Set Condition:
PEDAL SWITCH OPEN
When Monitored: Anytime the Adjustable Pedals Module is awake.
Set Condition: When the Adjustable Pedals Module detects higher than expected resis-
tance on the Switch Sense circuit and the Switch Ground circuit.
POSSIBLE CAUSES
ADJUSTABLE PEDALS MODULE INTERNAL FAULT
ADJUSTABLE PEDALS SWITCH CIRCUITS OPEN
INTERMITTENT DTC
ADJUSTABLE PEDALS SWITCH OPEN
TEST ACTION APPLICABILITY
1 With the DRBIIIt, erase DTC’s.
Turn the ignition on.
With the DRBIIIt, read DTC’s.
Does the DRBIIIt display PEDAL SWITCH OPEN DTC active?
Yes → Go To 2
2 Disconnect the Adjustable Pedals Module harness connector.
At each switch position, measure the resistance between the Switch Sense and Sense
Ground circuits.
Is the resistance above 24.6k ohms at any switch position?
3 Disconnect the Adjustable Pedals Switch harness connector.
Disconnect the Adjustable Pedals Module harness connector.
Measure the resistance of the Switch Sense and Switch Ground circuits.
Is the resistance below 5.0 ohms?
No → Go To 4
Yes → Go To 3
No → Replace and program theAdjustable Pedals Module in accordance
All
All
with the Service Information.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
All
Yes → Replace the Adjustable Pedals Switch.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
No → Repair the Adjustable Pedal Switch circuit open.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
24
Page 29
ADJUSTABLE PEDALS
PEDAL SWITCH OPEN — Continued
TEST ACTION APPLICABILITY
4 Turn the ignition off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
Yes → Repair as necessary.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
No → Test Complete.
All
25
Page 30
ADJUSTABLE PEDALS
Symptom:
PEDAL SWITCH SHORTED
When Monitored and Set Condition:
PEDAL SWITCH SHORTED
When Monitored: Anytime the Adjustable Pedals Module is awake.
Set Condition: When theAdjustable Module detects a short to battery, short to ground or
less than expected resistance on the Switch Sense and the Switch Ground circuits.
POSSIBLE CAUSES
ADJUSTABLE PEDALS MODULE INTERNAL FAULT
ADJUSTABLE PEDALS SWITCH CIRCUITS SHORTED
INTERMITTENT DTC
ADJUSTABLE PEDALS SWITCH SHORTED
TEST ACTION APPLICABILITY
1 With the DRBIIIt, erase DTC’s.
Turn the ignition on.
With the DRBIIIt, read DTC’s.
Does the DRBIIIt display PEDAL SWITCH SHORTED DTC active?
Yes → Go To 2
2 Disconnect the Adjustable Pedals Module harness connector.
Check the Switch Sense and Ground circuits for short to battery and short to ground.
At each switch position, measure the resistance between the Switch Sense and
Switch Ground circuits.
NOTE: A short to ground is any resistance less than 1M ohm.
Is any circuit shorted or is resistance below 1.0k ohm at any switch position?
3 Disconnect the Adjustable Pedals Switch harness connector.
Disconnect the Adjustable Pedals Module harness connector.
Check the Switch Sense and Switch Ground circuits for a short to battery, ground and
to each other.
Is either circuit shorted?
No → Go To 4
Yes → Go To 3
No → Replace and program theAdjustable Pedals Module in accordance
All
All
with the Service Information.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
All
Yes → Repair the Adjustable Pedals Switch circuit short.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
No → Replace the Adjustable Pedals Switch.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
26
Page 31
ADJUSTABLE PEDALS
PEDAL SWITCH SHORTED — Continued
TEST ACTION APPLICABILITY
4 Turn the ignition off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
Yes → Repair as necessary.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
No → Test Complete.
All
27
Page 32
ADJUSTABLE PEDALS
Symptom:
PEDAL SWITCH STUCK FORWARD
POSSIBLE CAUSES
ADJUSTABLE PEDALS MODULE INTERNAL FAULT
SWITCH FAILURE
INTERMITTENT DTC
TEST ACTION APPLICABILITY
1 With the DRBIIIt, erase DTC’s.
Turn the ignition on.
With the DRBIIIt, read DTC’s.
Does the DRBIIIt display PEDAL SWITCH STUCK FWD DTC active?
Yes → Go To 2
No → Go To 3
All
2 Disconnect the Adjustable Pedals switch connector.
Turn the ignition on.
With the DRBIIIt, read DTC’s.
Does the DRBIIIt display PEDAL SW STUCK FORWARD DTC active?
Yes → Replaceand program the Adjustable Pedals Module in accordance
No → Replace the Adjustable Pedals Switch.
3 Turn the ignition off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
Yes → Repair as necessary.
No → Test Complete.
All
with the Service Information.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
All
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
28
Page 33
ADJUSTABLE PEDALS
Symptom:
PEDAL SWITCH STUCK REARWARD
POSSIBLE CAUSES
ADJUSTABLE PEDALS MODULE INTERNAL FAULT
SWITCH FAILURE
INTERMITTENT DTC
TEST ACTION APPLICABILITY
1 With the DRBIIIt, erase DTC’s.
Turn the ignition on.
With the DRBIIIt, read DTC’s.
Does the DRBIIIt display PEDAL SWITCH STUCK RWD DTC active?
Yes → Go To 2
No → Go To 3
All
2 Disconnect the Adjustable Pedals switch connector.
Turn the ignition on.
With the DRBIIIt, read DTC’s.
Does the DRBIIIt display PEDAL SWITCH STUCK RWD DTC active?
Yes → Replaceand program the Adjustable Pedals Module in accordance
No → Replace the Adjustable Pedals Switch.
3 Turn the ignition off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
Yes → Repair as necessary.
No → Test Complete.
All
with the Service Information.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
All
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
29
Page 34
ADJUSTABLE PEDALS
Symptom:
*CAN’T ADJUST PEDALS
POSSIBLE CAUSES
ACTIVE DTC
GROUND OR BATTERY FAULT
VEHICLE IN CRUISE OR REVERSE
SWITCH FAULT
ADJUSTABLE PEDALS MODULE FAULT
TEST ACTION APPLICABILITY
1 With the DRBIIIt, erase DTCs.
With the DRBIIIt, read DTCs.
Are there any active DTCs?
All
Yes → Refer to symptom list for problems related to the DTC(s) dis-
No → Go To 2
2 NOTE: The Adjustable Pedals will not operate when the vehicle is in
Reverse or when Cruise Control is enabled.
With the DRBIIIt in Inputs/Outputs, read the EATX in Rev and the Cruise Control
Enabled state.
Does the DRBIIIt display the EATX in Rev or Cruise Control Enabled?
3 Disconnect the Adjustable Pedals Switch harness connector.
Measure the resistance of the Switch at each switch position.
Expected Resistance:
Neutral: 16.4k - 24.6k ohms
Forward: 960 - 1440 ohms
Aft: 2340 - 2860 ohms
Are the resistances within specification?
Yes → Correct the Cruise or Reverse condition.
No → Go To 3
Yes → Go To 4
played.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
All
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
All
No → Replace the Adjustable pedals Switch.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
30
Page 35
ADJUSTABLE PEDALS
*CAN’T ADJUST PEDALS — Continued
TEST ACTION APPLICABILITY
4 Disconnect the Adjustable Pedals Module harness connector.
Using a 12-volt test light connected to ground, check the Fused B+ circuit.
Using a 12-volt test light connected to 12-volts, check the Ground circuit.
Are the Fused B+ and Ground circuits OK?
Yes → Replaceand program the Adjustable Pedals Module in accordance
with the Service Information.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
No → Repair the system ground or battery concern.
Perform ADJUSTABLE PEDALS VERIFICATION TEST - VER
1.
All
31
Page 36
BRAKES (CAB)
Symptom:
BUS SYSTEM COMMUNICATION FAILURE
When Monitored and Set Condition:
BUS SYSTEM COMMUNICATION FAILURE
When Monitored: Ignition ON, every 7 ms.
Set Condition: When the CAB doesnot receive a message fromthe instrument cluster for
10 seconds.
POSSIBLE CAUSES
SHORT TO BATTERY OR SHORT TO GROUND
CAB-- INTERNAL FAULT
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, attempt to communicate with the MIC
Was the DRB able to I/D or communicate with the MIC?
Yes → Test Complete.
No → Repair the PCI Bus circuit for a short to voltage or a short to
All
ground.
Perform ABS VERIFICATION TEST - VER 1.
32
Page 37
BRAKES (CAB)
Symptom:
CAB INTERNAL FAILURE
When Monitored and Set Condition:
CAB INTERNAL FAILURE
When Monitored: Ignition on. The CAB monitors its internal microprocessors for correct
operation.
Set Condition: If the CAB detects an internal fault, the DTC is set.
POSSIBLE CAUSES
CAB - INTERNAL CONCERN
TEST ACTION APPLICABILITY
1 The only possible cause is a CAB internal concern.
If there are no possible causes remaining, view repair.
All
View repair.
Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
33
Page 38
BRAKES (CAB)
Symptom:
CLUSTER LAMP FAILURE
When Monitored and Set Condition:
CLUSTER LAMP FAILURE
When Monitored: Key ON. After Key-ON bulb check.
Set Condition: When the instrument cluster informs the CAB that the cluster cannot
turn on the ABS Lamp.
POSSIBLE CAUSES
CLUSTER DTC PRESENT
CLUSTER INTERNAL FAULT
CAB -- NO ABS INDICATOR MESSAGE
CAB -- ABS INDICATOR FAULT
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, read DTCs.
Are there any Instrument Cluster DTCs present?
Yes → Refer to the INSTRUMENT CLUSTER category for the related
2 Turn the ignition off.
Observe the instrument cluster indicators.
Turn the ignition on.
Did the ABS Indicator illuminate for several seconds and then go out?
3 NOTE: The DRBIIIt communication with the CAB must be operational for
the result of this test to be valid.
Turn the ignition off.
Remove Fuse 21 (ABS valve power) from the IPM.
Perform the Key-on Bulb Check.
Does the ABS Indicator remain on after the bulb check?
No → Go To 2
Yes → Go To 3
No → Go To 4
All
symptom(s).
Perform ABS VERIFICATION TEST - VER 1.
All
All
Yes → Test Complete.
No → Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
34
Page 39
BRAKES (CAB)
CLUSTER LAMP FAILURE — Continued
TEST ACTION APPLICABILITY
4 NOTE: The purpose of this test is to perform the Instrument Cluster self
test.
Turn the ignition off.
Depress and hold the Odometer Reset Button.
Turn the Key from OFF to ON and then back to OFF.
Release the Odometer Reset Button.
Do the Instrument Cluster Indicators and Gauges activate and deactivate?
Yes → Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No → Replace the Instrument Cluster in accordance with the Service
Information.
Perform ABS VERIFICATION TEST - VER 1.
All
35
Page 40
BRAKES (CAB)
Symptom List:
LEFT FRONT SENSOR CIRCUIT FAILURE
LEFT REAR SENSOR CIRCUIT FAILURE
RIGHT FRONT SENSOR CIRCUIT FAILURE
RIGHT REAR SENSOR CIRCUIT FAILURE
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be LEFT FRONT SENSOR CIRCUIT
FAILURE.
When Monitored and Set Condition:
LEFT FRONT SENSOR CIRCUIT FAILURE
When Monitored: Ignition on. The CAB monitors the wheel speed circuit every 7
milliseconds (ms).
Set Condition: If the CAB detects an open or shorted wheel speed sensor circuit, the
Diagnostic Trouble Code (DTC) will set.
LEFT REAR SENSOR CIRCUIT FAILURE
When Monitored: Ignition on. The CAB monitors the wheel speed circuit every 7
milliseconds (ms).
Set Condition: If the CAB detects an open or shorted wheel speed sensor circuit, the
Diagnostic Trouble Code (DTC) will set.
RIGHT FRONT SENSOR CIRCUIT FAILURE
When Monitored: Ignition on. The CAB monitors the wheel speed circuit every 7
milliseconds (ms).
Set Condition: If the CAB detects an open or shorted wheel speed sensor circuit, the
Diagnostic Trouble Code (DTC) will set.
RIGHT REAR SENSOR CIRCUIT FAILURE
When Monitored: Ignition on. The CAB monitors the wheel speed circuit every 7
milliseconds (ms).
Set Condition: If the CAB detects an open or shorted wheel speed sensor circuit, the
Diagnostic Trouble Code (DTC) will set.
POSSIBLE CAUSES
SENSOR OR CONNECTOR DAMAGE
WHEEL SPEED SENSOR FAULT
SENSOR CIRCUITS SHORTED OR OPEN
36
Page 41
BRAKES (CAB)
LEFT FRONT SENSOR CIRCUIT FAILURE — Continued
POSSIBLE CAUSES
CAB - INTERNAL FAULT
INTERMITTENT CIRCUIT DTC
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, record and erase DTC’s.
Turn the ignition off.
Turn the ignition on.
With the DRBIIIt, read DTC’s.
Does the DRBIIIt display a Wheel Speed Sensor Circuit Failure DTC?
Yes → Go To 2
No → Go To 5
All
2 Turn the ignition off.
Inspect the affected Wheel Speed Sensor and Connector.
Is the Sensor or Connector Damaged?
Yes → Repair as necessary.
No → Go To 3
3 Turn the ignition off.
Disconnect the affected Wheel Speed Sensor connector.
Note: Check connector - Clean/repair as necessary.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the Sensor 12 volt Supply
circuit.
Measure the resistance between ground and the Sensor Signal circuit.
Was the test light bright and the resistance between 100 and 300 ohms?
Yes → Replace the Wheel Speed Sensor in accordance with the Service
No → Go To 4
4 Turn the ignition off.
Disconnect the affected Wheel Speed Sensor connector.
Note: Check connector - Clean/repair as necessary.
Disconnect the CAB connector.
Note: Check connector - Clean/repair as necessary.
Turn the ignition on.
Check the Wheel Speed Sensor 12 volt Supply and Signal circuits for a short to
battery, ground, to each other and for an open.
For the purposes of this test, a short to ground must be below 15k ohms.
Was any circuit short or open found?
All
Perform ABS VERIFICATION TEST - VER 1.
All
Information.
Perform ABS VERIFICATION TEST - VER 1.
All
Yes → Repair the Wheel Speed Sensor circuit short or open.
Perform ABS VERIFICATION TEST - VER 1.
No → Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
37
Page 42
BRAKES (CAB)
LEFT FRONT SENSOR CIRCUIT FAILURE — Continued
TEST ACTION APPLICABILITY
5 Turn the ignition off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
Yes → Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No → Test Complete.
All
38
Page 43
Symptom:
LEFT FRONT WHEEL SPEED SIGNAL FAILURE
When Monitored and Set Condition:
LEFT FRONT WHEEL SPEED SIGNAL FAILURE
When Monitored: Wheel speed comparison is checked at drive off or every 7 milliseconds
(ms). Sensor signal continuity is checked every 7 milliseconds. Wheel speed phase length
supervision is checked every 7 milliseconds.
Set Condition: If, during an ABS stop, the CAB commands any valve solenoid on for an
extended length of time, and does not see a corresponding wheel speed change, the
Diagnostic Trouble Code (DTC) is set. The DTC can also set if the signal is missing or
erratic.
POSSIBLE CAUSES
SENSOR OR TONE WHEEL CONCERN
BRAKES (CAB)
CAB SETTING FALSE DTC
LEFT FRONT WHEEL SPEED SENSOR INOPERATIVE
INTERMITTENT SIGNAL DTC
TEST ACTION APPLICABILITY
1 With the DRBIIIt, erase DTCs.
Turn the ignition off.
Start the engine.
With an assistant to drive, use the DRBIIIt to monitor all wheel speed sensors.
Using the DRBIIIt, monitor the Left Front Wheel Speed Sensor while an assistant
drives the vehicle.
Slowly accelerate as straight as possible from a stop to 24 km/h (15 mph).
Is Left Front WSS Signal 0 km/h (0 mph) or differing from others by more than 5
km/h (3 mph)?
Yes → Go To 2
No → Go To 3
2 Inspect the Left Front Wheel Speed Sensor, Connector and Tone Wheel.
NOTE: Inspect components for damage, correct installation and sensor/tone
wheel air gap.
Are there any visible Sensor, Connector or Tone Wheel concerns?
Yes → Correct the sensor, connector or tone wheel concern as necessary.
All
All
The vehicle must be driven at 25 km/h (15 mph) to extinguish the
ABS indicator.
Perform ABS VERIFICATION TEST - VER 1.
No → Replace the Left Front Wheel Speed Sensor in accordance with
the Service Information. The vehicle must be driven at 25 km/h
(15 mph) to extinguish the ABS indicator.
Perform ABS VERIFICATION TEST - VER 1.
39
Page 44
BRAKES (CAB)
LEFT FRONT WHEEL SPEED SIGNAL FAILURE — Continued
TEST ACTION APPLICABILITY
3 With the DRBIIIt, read DTCs.
Did the DTC reoccur?
Yes → Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No → Go To 4
All
4 Turn the ignition off.
Visually inspect wheel speed sensor.
Visually inspect tone wheel.
Visually inspect wiring harness.
Visually inspect brakes for locking up due to lining contamination or overheating.
Inspect all Components for defects which may cause a Signal DTC to set.
Is any Component Damaged?
Yes → Repair as necessary. The vehicle must be driven at 25 km/h (15
No → Test Complete.
All
mph) to extinguish the ABS indicator.
Perform ABS VERIFICATION TEST - VER 1.
40
Page 45
Symptom:
LEFT REAR WHEEL SPEED SIGNAL FAILURE
When Monitored and Set Condition:
LEFT REAR WHEEL SPEED SIGNAL FAILURE
When Monitored: Wheel speed comparison is checked at drive off or every 7 milliseconds
(ms). Wheel speed circuit continuity is checked every 7 milliseconds. Wheel speed phase
length supervision is checked every 7 milliseconds.
Set Condition: If, during an ABS stop, the CAB commands any valve solenoid on for an
extended length of time, and does not see a corresponding wheel speed change, the
Diagnostic Trouble Code (DTC) is set. The DTC can also set if the signal is missing or
erratic.
POSSIBLE CAUSES
SENSOR OR TONE WHEEL CONCERN
BRAKES (CAB)
CAB SETTING FALSE DTC
LEFT REAR WHEEL SPEED SENSOR INOPERATIVE
INTERMITTENT SIGNAL DTC
TEST ACTION APPLICABILITY
1 With the DRBIIIt, erase DTCs.
Turn the ignition off.
Start the engine.
Slowly accelerate as straight as possible from a stop to 24 km/h (15 mph).
Using the DRBIIIt, monitor the Left Rear Wheel Speed Sensor while an assistant
drives the vehicle.
With the DRBIIIt, monitor all wheel speed sensors.
Is Left Rear WSS Signal 0 km/h (0 mph) or differing from others by more than 5 km/h
(3 mph)?
Yes → Go To 2
No → Go To 3
2 Inspect the Left Rear Wheel Speed Sensor, Connector and Tone Wheel.
NOTE: Inspect components for damage, correct installation and sensor/tone
wheel air gap.
Are there any visible Sensor, Connector or Tone Wheel concerns?
Yes → Correct the sensor, connector or tone wheel concern as necessary.
All
All
The vehicle must be driven at 25 km/h (15 mph) to extinguish the
ABS indicator.
Perform ABS VERIFICATION TEST - VER 1.
No → Replace the Left Rear Wheel Speed Sensor in accordance with the
Service Information. The vehicle must be driven at 25 km/h (15
mph) to extinguish the ABS indicator.
Perform ABS VERIFICATION TEST - VER 1.
41
Page 46
BRAKES (CAB)
LEFT REAR WHEEL SPEED SIGNAL FAILURE — Continued
TEST ACTION APPLICABILITY
3 With the DRBIIIt, read DTCs.
Did the DTC reoccur?
Yes → Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No → Go To 4
All
4 Turn the ignition off.
Visually inspect wheel speed sensor.
Visually inspect tone wheel.
Visually inspect wiring harness.
Visually inspect brakes for locking up due to lining contamination or overheating.
Inspect all Components for defects which may cause a Signal DTC to set.
Is any Component Damaged?
Yes → Repair as necessary. The vehicle must be driven at 25 km/h (15
No → Test Complete.
All
mph) to extinguish the ABS indicator.
Perform ABS VERIFICATION TEST - VER 1.
42
Page 47
Symptom:
PUMP CIRCUIT FAILURE
When Monitored and Set Condition:
PUMP CIRCUIT FAILURE
When Monitored: Ignition on. The CAB commands the pump on at 20 km/h (12 mph) to
check its operation, if the brake switch is not applied. If the brake is applied, the test will
run at 40 km/h (25 mph). The CAB monitors pump voltage every 7 milliseconds.
Set Condition: The DTC is stored when the CAB detects: 1) Improper voltage decay after
the pump was turned off. 2) Pump not energized by the CAB, but voltage is present for 3.5
seconds. 3) Pump is turned on by the CAB, but without sufficient voltage to operate it.
POSSIBLE CAUSES
PUMP HARNESS DISCONNECTED
BRAKES (CAB)
CAB - PUMP MOTOR RUNNING CONTINUOUSLY
ABS PUMP MOTOR INTERMITTENT DTC
GROUND CIRCUIT HIGH RESISTANCE
FUSED B(+) CIRCUIT OPEN
GROUND CIRCUIT OPEN
CAB - INTERNAL FAULT
CAB - SETTING FALSE CODE
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Turn the ignition on.
Monitor the pump motor for continuous operation.
Is the pump motor running continuously?
Yes → Replace the Controller Anti-Lock Brake in accordance with the
No → Go To 2
2 Turn the ignition on.
With the DRBIIIt, read DTC’s.
With the DRBIIIt, erase DTC’s.
Turn the ignition off.
Turn the ignition on.
With the DRBIIIt, actuate the ABS pump motor.
Did the Pump Motor operate when actuated?
All
Service Information. The vehicle must be driven at 25 km/h (15
mph) to extinguish the ABS indicator.
Perform ABS VERIFICATION TEST - VER 1.
All
Yes → Go To 3
No → Go To 4
43
Page 48
BRAKES (CAB)
PUMP CIRCUIT FAILURE — Continued
TEST ACTION APPLICABILITY
3 Turn the ignition off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Make sure the Pump Motor connecter is secure.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
Yes → Repair as necessary. The vehicle must be driven at 25 km/h (15
mph) to extinguish the ABS indicator.
Perform ABS VERIFICATION TEST - VER 1.
No → Replace the Controller Anti-Lock Brake in accordance with the
Service Information. The vehicle must be driven at 25 km/h (15
mph) to extinguish the ABS indicator.
Perform ABS VERIFICATION TEST - VER 1.
All
4 Check the short Wiring Harness between the ABS Pump and the CAB.
Check for disconnect and damage.
Is the harness disconnected or damaged?
Yes → Reconnect or repair the Pump Harness as necessary.
No → Go To 5
5 Turn the ignition off.
Disconnect the CAB connector.
Note: Check connector - Clean/repair as necessary.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the Pump Motor Fused B+
circuit.
Does the test light illuminate brightly?
Yes → Go To 6
No → Repair the Fused B(+) circuit for an open. The vehicle must be
6 Turn the ignition off.
Disconnect CAB Connector.
Note: Check connector - Clean/repair as necessary.
Measure the resistance of the CAB ground circuits.
Is the resistance below 1.0 ohm?
All
Perform ABS VERIFICATION TEST - VER 1.
All
driven at 25 km/h (15 mph) to extinguish the ABS indicator.
Perform ABS VERIFICATION TEST - VER 1.
All
Yes → Go To 7
No → Repair the ground circuit for an open. The vehicle must be driven
at 25 km/h (15 mph) to extinguish the ABS indicator.
Perform ABS VERIFICATION TEST - VER 1.
44
Page 49
BRAKES (CAB)
PUMP CIRCUIT FAILURE — Continued
TEST ACTION APPLICABILITY
7 Make sure the Pump Motor connector is secure.
Turn the ignition on.
With the DRBIIIt, enable pump motor actuation.
NOTE: Pump motor will not operate, but voltage will be applied.
Measure the voltage drop across theABS ground circuit connection, with pump motor
actuation enabled.
Is the voltage below 0.1 volt?
Yes → Go To 8
No → Repair the Ground circuit for high resistance. The vehicle must be
driven at 25 km/h (15 mph) to extinguish the ABS indicator.
Perform ABS VERIFICATION TEST - VER 1.
8 If there are no possible causes remaining, view repair. All
Repair
Replace the Controller Anti-Lock Brake in accordance with the
Service Information. The vehicle must be driven at 25 km/h (15
mph) to extinguish the ABS indicator.
Perform ABS VERIFICATION TEST - VER 1.
All
45
Page 50
BRAKES (CAB)
Symptom:
RIGHT FRONT WHEEL SPEED SIGNAL FAILURE
When Monitored and Set Condition:
RIGHT FRONT WHEEL SPEED SIGNAL FAILURE
When Monitored: Wheel speed comparison is checked at drive off or every 7 milliseconds
(ms). Wheel speed continuity is checked every 7 milliseconds. Wheel speed phase length
supervision is checked every 7 milliseconds.
Set Condition: If, during an ABS stop, the CAB commands any valve solenoid on for an
extended length of time, and does not see a corresponding wheel speed change, the
Diagnostic Trouble Code (DTC) is set. The DTC can also set if the signal is missing or
erratic.
POSSIBLE CAUSES
SENSOR OR TONE WHEEL CONCERN
CAB SETTING FALSE DTC
RIGHT FRONT WHEEL SPEED SENSOR INOPERATIVE
INTERMITTENT SIGNAL DTC
TEST ACTION APPLICABILITY
1 With the DRBIIIt, erase DTCs.
Turn the ignition off.
Start the engine.
Slowly accelerate as straight as possible from a stop to 24 km/h (15 mph).
Using the DRBIIIt, monitor the Right Front Wheel Speed Sensor while an assistant
drives the vehicle.
With the DRBIIIt, monitor all wheel speed sensors.
Is Right Front WSS Signal 0 km/h (0 mph) or differing from others by more than 5
km/h (3 mph)?
Yes → Go To 2
No → Go To 3
2 Inspect the Right Front Wheel Speed Sensor, Connector and Tone Wheel.
NOTE: Inspect components for damage, correct installation and sensor/tone
wheel air gap.
Are there any visible Sensor, Connector or Tone Wheel concerns?
Yes → Correct the sensor, connector or tone wheel concern as necessary.
All
All
The vehicle must be driven at 25 km/h (15 mph) to extinguish the
ABS indicator.
Perform ABS VERIFICATION TEST - VER 1.
No → Replace the Right Front Wheel Speed Sensor in accordance with
the Service Information. The vehicle must be driven at 25 km/h
(15 mph) to extinguish the ABS indicator.
Perform ABS VERIFICATION TEST - VER 1.
46
Page 51
BRAKES (CAB)
RIGHT FRONT WHEEL SPEED SIGNAL FAILURE — Continued
TEST ACTION APPLICABILITY
3 With the DRBIIIt, read DTCs.
Did the DTC reoccur?
Yes → Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No → Go To 4
All
4 Turn the ignition off.
Visually inspect wheel speed sensor.
Visually inspect tone wheel.
Visually inspect wiring harness.
Visually inspect brakes for locking up due to lining contamination or overheating.
Inspect all Components for defects which may cause a Signal DTC to set.
Is any Component Damaged?
Yes → Repair as necessary. The vehicle must be driven at 25 km/h (15
No → Test Complete.
All
mph) to extinguish the ABS indicator.
Perform ABS VERIFICATION TEST - VER 1.
47
Page 52
BRAKES (CAB)
Symptom:
RIGHT REAR WHEEL SPEED SIGNAL FAILURE
When Monitored and Set Condition:
RIGHT REAR WHEEL SPEED SIGNAL FAILURE
When Monitored: Wheel speed comparison is checked at drive off or every 7 milliseconds
(ms). Wheel speed circuit continuity is checked every 7 milliseconds. Wheel speed phase
length supervision is checked every 7 milliseconds.
Set Condition: If, during an ABS stop, the CAB commands any valve solenoid on for an
extended length of time, and does not see a corresponding wheel speed change, the
Diagnostic Trouble Code (DTC) is set. The DTC can also set if the signal is missing or
erratic.
POSSIBLE CAUSES
SENSOR OR TONE WHEEL CONCERN
CAB SETTING FALSE CODE
RIGHT REAR WHEEL SPEED SENSOR INOPERATIVE
INTERMITTENT SIGNAL DTC
TEST ACTION APPLICABILITY
1 With the DRBIIIt, erase DTCs.
Turn the ignition off.
Start the engine.
Slowly accelerate as straight as possible from a stop to 24 km/h (15 mph).
Using the DRBIIIt, monitor the Right Rear Wheel Speed Sensor while an assistant
drives the vehicle.
With the DRBIIIt, monitor all wheel speed sensors.
Is Right Rear WSS Signal 0 km/h (0 mph) or differing from others by more than 5
km/h (3 mph)?
Yes → Go To 2
No → Go To 3
2 Inspect the Right Rear Wheel Speed Sensor, Connector and Tone Wheel.
NOTE: Inspect for damage, correct installation and sensor/tone wheel air
gap.
Are there any visible Sensor, Connector or Tone Wheel concerns?
Yes → Correct the sensor, connector or tone wheel concern as necessary.
All
All
The vehicle must be driven at 25 km/h (15 mph) to extinguish the
ABS indicator.
Perform ABS VERIFICATION TEST - VER 1.
No → Replace the Left Rear Wheel Speed Sensor in accordance with the
Service Information. The vehicle must be driven at 25 km/h (15
mph) to extinguish the ABS indicator.
Perform ABS VERIFICATION TEST - VER 1.
48
Page 53
BRAKES (CAB)
RIGHT REAR WHEEL SPEED SIGNAL FAILURE — Continued
TEST ACTION APPLICABILITY
3 With the DRBIIIt, read DTCs.
Did the DTC reoccur?
Yes → Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No → Go To 4
All
4 Turn the ignition off.
Visually inspect wheel speed sensor.
Visually inspect tone wheel.
Visually inspect wiring harness.
Visually inspect brakes for locking up due to lining contamination or overheating.
Inspect all Components for defects which may cause a Signal DTC to set.
Is any Component Damaged?
Yes → Repair as necessary. The vehicle must be driven at 25 km/h (15
No → Test Complete.
All
mph) to extinguish the ABS indicator.
Perform ABS VERIFICATION TEST - VER 1.
49
Page 54
BRAKES (CAB)
Symptom:
SYSTEM OVERVOLTAGE
When Monitored and Set Condition:
SYSTEM OVERVOLTAGE
When Monitored: Ignition on. The CAB monitors the Fused B(+) circuit at all times for
proper system voltage.
Set Condition: If the voltage is above 16.5 volts for greater than 420 milliseconds (ms),
the Diagnostic Trouble Code (DTC) is set.
POSSIBLE CAUSES
BATTERY OVERCHARGED
FUSED IGNITION SWITCH OUTPUT HIGH
GROUND CIRCUIT OPEN
CAB - INTERNAL FAULT
INTERMITTENT DTC
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, erase DTC’s.
Turn the ignition off.
Turn the ignition on.
Start the engine.
With the DRBIIIt, read DTC’s.
Does the DRBIIIt display System Overvoltage DTC?
Yes → Go To 2
No → Go To 6
2 Turn the ignition off.
Inspect for battery charger connected to battery.
Is a battery charger connected to the battery?
Yes → Charge battery to proper level. Disconnect the battery charger.
No → Go To 3
All
All
Clear DTC’s.
Perform ABS VERIFICATION TEST - VER 1.
50
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BRAKES (CAB)
SYSTEM OVERVOLTAGE — Continued
TEST ACTION APPLICABILITY
3 Turn the ignition off.
Disconnect the CAB connector.
Note: Check connector - Clean/repair as necessary.
Start the engine.
Raise engine speed above 1,800 RPM.
Measure the battery voltage.
Is the voltage above 16.5 volts ?
Yes → Refer to appropriate service information for charging system
testing and repair.
Perform ABS VERIFICATION TEST - VER 1.
No → Go To 4
All
4 Turn the ignition off.
Disconnect the CAB connector.
Note: Check connector - Clean/repair as necessary.
Measure the resistance of the ground circuits.
Is the resistance below 1.0 ohm?
Yes → Go To 5
No → Repair the Ground circuit for an open.
5 If there are no potential causes remaining, view repair. All
Repair
6 Turn the ignition off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
Yes → Repair as necessary.
No → Test Complete.
All
Perform ABS VERIFICATION TEST - VER 1.
Replace the Controller Antilock Brake.
Perform ABS VERIFICATION TEST - VER 1.
All
Perform ABS VERIFICATION TEST - VER 1.
51
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BRAKES (CAB)
Symptom:
SYSTEM UNDERVOLTAGE
When Monitored and Set Condition:
SYSTEM UNDERVOLTAGE
When Monitored: Ignition on. The CAB monitors the Fused Ignition Switch Output
circuit voltage above 10 km/h (6 mph) every 7 milliseconds for proper system voltage.
Set Condition: If the voltage is below 9.5 volts, the Diagnostic Trouble Code (DTC) is set.
POSSIBLE CAUSES
BATTERY VOLTAGE LOW
INTERMITTENT DTC
FUSED IGNITION SWITCH OUTPUT CIRCUIT HIGH RESISTANCE
CAB - INTERNAL FAULT
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, erase DTC’s.
Turn the ignition off.
Turn the ignition on.
Start the engine.
Drive the vehicle above 16 km/h (10 mph) for at least 20 seconds.
Stop the vehicle
With the DRBIIIt, read DTC’s.
Does the DRBIIIt display System Undervoltage DTC?
Yes → Go To 2
No → Go To 5
2 Engine Running.
Measure the battery voltage.
Is the battery voltage below 10 volts?
Yes → Refer to appropriate service information for charging system
No → Go To 3
3 Disconnect the CAB harness connector.
Turn the ignition on.
Measure the voltage of the Fused Ignition Switch circuit.
Is the voltage above 10 volts?
All
All
testing and repair.
Perform ABS VERIFICATION TEST - VER 1.
All
Yes → Go To 4
No → Repair the Fused Ignition Switch Output Circuit for high resis-
tance
Perform ABS VERIFICATION TEST - VER 1.
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BRAKES (CAB)
SYSTEM UNDERVOLTAGE — Continued
TEST ACTION APPLICABILITY
4 If there are no potential causes remaining, view repair. All
Repair
Replace the Controller Antilock Brake.
Perform ABS VERIFICATION TEST - VER 1.
5 Turn the ignition off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
Yes → Repair as necessary.
No → Test Complete.
All
Perform ABS VERIFICATION TEST - VER 1.
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BRAKES (CAB)
Symptom:
VALVE POWER FEED FAILURE
When Monitored and Set Condition:
VALVE POWER FEED FAILURE
When Monitored: Ignition ON for at least 3.5 seconds. ABS Power Relay closed. Valve
command for a particular solenoid not present.
Set Condition: Low feedback voltage from the low side of all the solenoids for over 20
consecutive controller checks spaced 5 ms apart.
POSSIBLE CAUSES
INTERMITTENT DTC
BLOWN FUSE - FUSED B(+) CIRCUIT
NO B+ SUPPLY TO FUSE
FUSED B(+) CIRCUIT OPEN
B(+) CIRCUIT SHORTED TO GROUND
CAB - FUSED B(+) CIRCUIT OPEN
CAB - FUSED B(+) CIRCUIT SHORTED TO GROUND
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, erase DTC’s.
Turn the ignition off.
Turn the ignition on.
Drive the vehicle above 25 km/h (15 mph) for at least 10 seconds.
Stop the vehicle.
With the DRBIIIt, read DTC’s.
Does the DRBIIIt display Valve Power Feed Circuit DTC present right now?
Yes → Go To 2
No → Go To 9
2 Turn the ignition off.
Remove and Inspect the ABS Fuse 21 in the IPM.
Is the Fuse blown?
Yes → Go To 3
All
All
No → Go To 6
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BRAKES (CAB)
VALVE POWER FEED FAILURE — Continued
TEST ACTION APPLICABILITY
3 Turn the ignition off.
Remove the ABS Fuse 21 from the IPM.
Disconnect the CAB harness connector.
Note: Check connector - Clean/repair as necessary.
Using a test light connected to 12 volts, probe the Fused B(+) Circuit.
Does the test light illuminate brightly?
Yes → Repair the Fused B(+) Circuit short to ground.
Perform ABS VERIFICATION TEST - VER 1.
No → Go To 4
All
4 Turn the ignition off.
Remove the ABS Fuse 21 from the IPM.
The CAB must be connected for the results of this test to be valid.
Using a test light connected to 12 volts, probe the Fused B(+) Circuit at the IPM fuse
terminal.
Does the test light illuminate brightly?
Yes → Replace the Controller Antilock Brake in accordance with the
No → Go To 5
5 Turn the ignition off.
If there are no potential causes remaining, view repair.
Continue
6 Remove the ABS Fuse 21 from the IPM.
Turn the ignition on.
Measure the voltage of the Fused B+ supply to Fuse 21 in the IPM.
Is the voltage above 10 volts?
Yes → Go To 7
No → Repair the B+ Supply circuit for an open.
All
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
All
Replace the Fuse.
Perform ABS VERIFICATION TEST - VER 1.
All
Perform ABS VERIFICATION TEST - VER 1.
7 Turn the ignition off.
Remove the ABS Fuse 21 from the IPM.
Disconnect the CAB harness connector.
Note: Check connector - Clean/repair as necessary.
Measure the resistance of the Fused B(+) circuit between IPM Fuse terminal 21 and
the CAB connector.
Is the resistance below 5 ohms?
Yes → Go To 8
No → Repair the Fuse B+ circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
8 If there are no possible causes remaining, view repair. All
Repair
Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
55
All
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BRAKES (CAB)
VALVE POWER FEED FAILURE — Continued
TEST ACTION APPLICABILITY
9 Turn the ignition off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
Yes → Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No → Test Complete.
All
56
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BRAKES (CAB)
Symptom:
*BRAKE LAMP SWITCH
POSSIBLE CAUSES
CHECK BRAKE LAMP SWITCH OUTPUT
BRAKE LAMP SWITCH B+ OPEN
BRAKE LAMP SWITCH OUTPUT CIRCUIT SHORT OR OPEN
BRAKE LAMP SWITCH OPEN
CAB -- INTERNAL OPEN
TEST ACTION APPLICABILITY
1 With the DRBIIIt in Inputs/Outputs, read the Brake Lamp Switch state.
Press and release the brake pedal.
Does the DRBIIIt display PRESSED and RELEASED?
All
Yes → The Brake Lamp Switch is OK.
No → Go To 2
2 Disconnect the Brake Lamp Switch harness connector.
Using a 12-volt test light connected to ground, check the Brake Lamp Switch Fused
B+ circuit.
Does the test light illuminate brightly ?
Yes → Go To 3
No → Repair the Brake Lamp Switch Fused B+ circuit for an open.
3 Disconnect the Brake Lamp Switch harness connector.
Connect a jumper wire between the Brake Lamp Switch B+ and Output circuits.
With the DRBIIIt in Inputs/Outputs, read the Brake Lamp Switch state.
Does the DRBIIIt display PRESSED?
Yes → Replace the Brake Lamp Switch in accordance with the Service
No → Go To 4
4 Disconnect the CAB harness connector.
Disconnect the Brake Lamp Switch harness connector.
Check the Brake Lamp Switch Output circuit for a short to voltage and for an open.
Is the Brake Lamp Switch Output circuit shorted or open?
Perform ABS VERIFICATION TEST - VER 1.
All
Perform ABS VERIFICATION TEST - VER 1.
All
Information.
Perform ABS VERIFICATION TEST - VER 1.
All
Yes → Repair the Brake Lamp Switch Output circuit for a short to
voltage or an open.
Perform ABS VERIFICATION TEST - VER 1.
No → Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
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BRAKES (CAB)
Symptom:
*TRAC OFF INDICATOR NEVER/ALWAYS ON
POSSIBLE CAUSES
TRAC OFF SW GROUND OPEN
TRAC OFF SWITCH OPEN
TRAC OFF SWITCH SENSE CIRCUIT SHORT TO B+ OR OPEN
BCM -- NO TRAC OFF MESSAGE
CLUSTER INTERNAL FAULT-- TRAC OFF INDICATOR INOPERATIVE
CLUSTER-PERMANENT TRAC OFF INDICATOR
TRAC OFF SWITCH INTERNAL SHORT
TRAC OFF SWITCH SENSE CIRCUIT SHORT TO GROUND
BCM -- PERMANENT TRAC OFF MESSAGE
TEST ACTION APPLICABILITY
1 Note: If any DTC’s are present, they must be repaired prior to performing
this test.
Turn the ignition off.
Turn the ignition on.
Observe the TRAC OFF indicator.
Did the TRAC OFF indicator come on for several seconds then go out?
Yes → Go To 2
No. TRAC OFF Indicator does not come on.
No. TRAC OFF Indicator does not go out.
2 Disconnect the TRAC OFF Switch harness connector.
Using a 12-volt test light connected to 12-volts, check the TRAC OFF Switch Ground
circuit.
Does the test light illuminate brightly?
Yes → Go To 3
No → Repair the TRAC OFF Switch Ground circuit for an open.
3 Turn the ignition off.
Disconnect the TRAC OFF Switch harness connector.
Turn the ignition on.
Connect and disconnect a jumper wire between TRAC OFF Switch Ground and
TRAC OFF Switch Sense circuits.
Does the TRAC OFF Indicator light and then go out?
All
Go To 5
Go To 6
All
Perform ABS VERIFICATION TEST - VER 1.
All
Yes → Replace the TRAC OFF switch.
Perform ABS VERIFICATION TEST - VER 1.
No → Go To 4
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BRAKES (CAB)
*TRAC OFF INDICATOR NEVER/ALWAYS ON — Continued
TEST ACTION APPLICABILITY
4 Turn the ignition off.
Disconnect the TRAC OFF Switch harness connector.
Disconnect the CAB harness connector.
Turn the ignition on.
Check the TRAC OFF Switch Sense circuit for short to B+ and for an open.
Is the Sense circuit shorted or open?
Yes → Repair the TRAC OFF Switch Sense circuit for a short to battery
or for an open.
Perform ABS VERIFICATION TEST - VER 1.
No → Replace the Body Control Module in accordance with the Service
Information.
Perform ABS VERIFICATION TEST - VER 1.
All
5 Turn the ignition off.
NOTE: The purpose of this test is to perform the Instrument Cluster self
test.
Depress and hold the Odometer Reset Button.
Turn the Key from OFF to ON and then back to OFF.
Release the Odometer Reset Button.
Do the Instrument Cluster Indicators and Gauges activate and deactivate?
Yes → Replace the Body Control Module in accordance with the Service
No → Replace the Instrument Cluster in accordance with the Service
6 NOTE: The purpose of this test is to perform the Instrument Cluster self
test.
Depress and hold the Odometer Reset Button.
Turn the Key from OFF to ON and then back to OFF.
Release the Odometer Reset Button.
Do the Instrument Cluster Indicators and Gauges activate and deactivate?
Yes → Go To 7
No → Replace the Instrument Cluster in accordance with the Service
All
Information.
Perform ABS VERIFICATION TEST - VER 1.
Information.
Perform ABS VERIFICATION TEST - VER 1.
All
Information.
Perform ABS VERIFICATION TEST - VER 1.
7 Turn the ignition off.
Disconnect the TRAC OFF Switch harness connector.
Turn the ignition on.
Does the TRAC OFF Indicator light and then go out?
Yes → Replace the TRAC OFF switch.
Perform ABS VERIFICATION TEST - VER 1.
No → Go To 8
All
59
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BRAKES (CAB)
*TRAC OFF INDICATOR NEVER/ALWAYS ON — Continued
TEST ACTION APPLICABILITY
8 Turn the ignition off.
Disconnect the TRAC OFF Switch harness connector.
Disconnect the BCM C4 harness connector.
Check the TRAC OFF Switch Sense circuit for short to ground.
Is the Sense circuit shorted to ground?
Yes → Repair the TRAC OFF Switch Sense circuit for a short to ground.
Perform ABS VERIFICATION TEST - VER 1.
No → Replace the Body Control Module in accordance with the Service
Information.
Perform ABS VERIFICATION TEST - VER 1.
All
60
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BRAKES (CAB)
Symptom:
*TRAC ON INDICATOR NEVER/ALWAYS ON
POSSIBLE CAUSES
CAB -- INTERNAL FAULT
CHECK TRACTION CONTROL SYSTEM
CLUSTER FAILS SELF TEST
CAB - NO TRAC MESSAGE
TEST ACTION APPLICABILITY
1 NOTE: The DRBIIIt must be able to communicate with the CAB prior to
performing this test.
NOTE: Note: If any CAB DTC’s are present, they must be repaired prior to
performing this test.
Perform the KEY-ON bulb test.
Did the TRAC Indicator illuminate and then go out?
All
Yes → Go To 2
No → Go To 3
2 Make sure the TractionControl system has not been deactivated with the TRAC OFF
switch.
NOTE: The purpose of this test is to determine if the Traction Control
system is operating.
With the DRBIIIt in Inputs/Outputs, read the ABS Pump Motor voltage state.
Accelerate sufficient to cause drive wheel slip.
Does the TRAC Indicator illuminate and the DRBIIIt display approximately 9 volts?
3 NOTE: The purpose of this test is to perform the Instrument Cluster self
test.
Depress and hold the Odometer Reset Button.
Turn the Key from OFF to ON and then back to OFF.
Release the Odometer Reset Button.
Do the Instrument Cluster Indicators and Gauges activate and deactivate?
Yes → The traction control system is functioning normally.
No → Replace the Controller Antilock Brake in accordance with the
Yes → Replace the Controller Antilock Brake in accordance with the
All
Perform ABS VERIFICATION TEST - VER 1.
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
All
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No → Replace the Instrument Cluster in accordance with the Service
Information.
Perform ABS VERIFICATION TEST - VER 1.
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VERIFICATION TESTS
Verification Tests
ABS VERIFICATION TEST - VER 1 APPLICABILITY
1. Turn the ignition off.
2. Connect all previously disconnected components and connectors.
3. Ensure all accessories are turned off and the battery is fully charged.
4. Ensure that the Ignition is on, and with the DRBIIIt, erase all Diagnostic Trouble Codes
from ALL modules. Start the engine and allow it to run for 2 minutes and fully operate the
system that was malfunctioning.
5. Turn the ignition off and wait 5 seconds. Turn the ignition on and using the DRBIII, read
DTC’s from ALL modules.
6. If any Diagnostic Trouble Codes are present, return to Symptom list and troubleshoot new
or recurring symptom.
7. If there are no DTC’s present after turning ignition on, road test the vehicle for at least 5
minutes. Perform several antilock braking stops.
8. Caution: Ensure braking capability is available before road testing.
9. Again, with the DRBIIIt read DTC’s. If any DTC’s are present, return to Symptom list.
10. If there are no Diagnostic Trouble Codes (DTC’s) present, and the customer’s concern can
no longer be duplicated, the repair is complete.
Are any DTC’s present or is the original concern still present?
Yes → Repair is not complete, refer to appropriate symptom.
All
No → Repair is complete.
ADJUSTABLE PEDALS VERIFICATION TEST - VER 1 APPLICABILITY
1. If the Adjustable Pedals Module was replaced, program two pedal positions if equipped with
memory function.
2. Activate the Adjustable Pedals through the full range of movement.
3. Verify that the Adjustable Pedals system is disabled with the vehicle in Reverse.
4. Verify that the Adjustable Pedals system is disabled with Speed Control activated.
5. With the DRBIIIt, erase DTCs.
6. With the DRBIIIt, read DTCs.
Are any DTC’s present or is the original complaint still present?
Yes → Repair is not complete, refer to appropriate symptom.
No → Repair is complete.
All
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8.0 COMPONENT LOCATIONS
8.1 CONTROLLER ANTILOCK BRAKE (CAB)
8.2 DATA LINK CONNECTOR
COMPONENT LOCATIONS
C
O
M
P
O
N
E
N
T
L
O
C
A
T
I
O
N
S
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COMPONENT LOCATIONS
C
O
8.3 FUSES
M
P
O
N
E
N
T
L
O
C
A
T
I
O
N
S
8.4 TRACTION CONTROL SWITCH
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8.4.1 TRACTION CONTROL INDICATORS
8.5 WHEEL SPEED SENSORS
8.5.1 FRONT
COMPONENT LOCATIONS
C
O
M
P
O
N
E
N
T
L
O
C
A
T
I
O
N
S
65
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COMPONENT LOCATIONS
C
O
8.5 WHEEL SPEED SENSORS (Continued)
M
8.5.2 REAR
P
O
N
E
N
T
L
O
C
A
T
I
O
N
S
8.5A WHEEL SPEED SENSOR CONNECTORS
8.5A.1 FRONT
66
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8.5A.2 REAR
8.6 BRAKE LAMP SWITCH
COMPONENT LOCATIONS
C
O
M
P
O
N
E
N
T
L
O
C
A
T
I
O
N
S
8.7 ADJUSTABLE PEDALS SWITCH
67
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COMPONENT LOCATIONS
C
O
8.8 ADJUSTABLE PEDALS MODULE
M
P
O
N
E
N
T
L
O
C
A
T
I
O
N
S
8.9 ADJUSTABLE PEDALS SENSOR
8.10 ADJUSTABLE PEDALS SWITCH CONNECTOR
68
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9.0 CONNECTOR PINOUTS
CONNECTOR PINOUTS
ADJUSTABLE PEDALS MODULE (EXCEPT BUILT-UP-EXPORT) - DK. GRAY 8 WAY
CAV CIRCUIT FUNCTION
1 A108 18LG/RD FUSED B(+)
2 D25 20WT/VT PCI BUS
3- 4 Z140 18BK/YL GROUND
5 A114 18GY/RD FUSED B(+) (I.O.D.)
6- 7 Q100 20OR/WT ADJUSTABLE PEDALS SWITCH SENSE
8 Q900 20OR/BK ADJUSTABLE PEDALS SWITCH GROUND
ADJUSTABLE PEDALS SWITCH (EXCEPT BUILT-UP-EXPORT) - WHITE 2 WAY
CAV CIRCUIT FUNCTION
1 Q100 20OR/WT ADJUSTABLE PEDALS SWITCH SENSE
2 Q900 20OR/BK ADJUSTABLE PEDALS SWITCH GROUND
CAV CIRCUIT FUNCTION
1 Z107 12BK/DG GROUND
2 B1 18DG/OR RIGHT REAR WHEEL SPEED SENSOR SIGNAL
3 B2 18DG/LB RIGHT REAR WHEEL SPEED SENSOR 12 VOLT SUPPLY
4- 5 D25 18WT/VT PCI BUS
6 B6 18DG/WT RIGHT FRONT WHEEL SPEED SENSOR SIGNAL
7 B7 18DG/VT RIGHT FRONT WHEEL SPEED SENSOR 12 VOLT SUPPLY
8- -
9 A111 12DG/RD FUSED B(+)
10 F500 18DG/PK FUSED IGNITION SWITCH OUTPUT (RUN)
11 - 12 - 13 - 14 - 15 - 16 Z127 12BK/DG GROUND
17 - 18 L50 18WT/TN BRAKE LAMP SWITCH OUTPUT
19 B3 18DG/YL LEFT REAR WHEEL SPEED SENSOR SIGNAL
20 B4 18DG/GY LEFT REAR WHEEL SPEED SENSOR 12 VOLT SUPPLY
21 - 22 B8 18DG/TN LEFT FRONT WHEEL SPEED SENSOR SIGNAL
23 B9 18DG/WT (3.3L/3.8L) LEFT FRONT WHEEL SPEED SENSOR 12 VOLT SUPPLY
23 B9 18DG/LG (EXCEPT
3.3L/3.8L)
24 A107 12TN/RD FUSED B(+)
CONTROLLER ANTILOCK BRAKE - BLACK 24 WAY
LEFT FRONT WHEEL SPEED SENSOR 12 VOLT SUPPLY
C
O
N
N
E
C
T
O
R
P
I
N
O
U
T
S
69
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CONNECTOR PINOUTS
C
O
N
N
E
C
T
O
R
P
I
N
O
U
T
S
CAV CIRCUIT FUNCTION
1 B9 18DG/WT (3.3L/3.8L) LEFT FRONT WHEEL SPEED SENSOR 12 VOLT SUPPLY
1 B9 18DG/LG (EXCEPT
3.3L/3.8L)
2 B8 18DG/TN LEFT FRONT WHEEL SPEED SENSOR SIGNAL
CAV CIRCUIT FUNCTION
1 B4 18DG/GY LEFT REAR WHEEL SPEED SENSOR 12 VOLT SUPPLY
2 B3 18DG/YL LEFT REAR WHEEL SPEED SENSOR SIGNAL
CAV CIRCUIT FUNCTION
1 TN GROUND
2 RD PUMP/MOTOR RELAY OUTPUT
LEFT FRONT WHEEL SPEED SENSOR - GRAY 2 WAY
LEFT FRONT WHEEL SPEED SENSOR 12 VOLT SUPPLY
LEFT REAR WHEEL SPEED SENSOR - BLACK 2 WAY
PUMP MOTOR CONNECTOR
CAV CIRCUIT FUNCTION
1 B7 18DG/VT RIGHT FRONT WHEEL SPEED SENSOR 12 VOLT SUPPLY
2 B6 18DG/WT RIGHT FRONT WHEEL SPEED SENSOR SIGNAL
RIGHT FRONT WHEEL SPEED SENSOR - GRAY 2 WAY
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CONNECTOR PINOUTS
CAV CIRCUIT FUNCTION
RIGHT REAR WHEEL SPEED SENSOR - BLACK 2 WAY
1 B2 18DG/LB RIGHT REAR WHEEL SPEED SENSOR 12 VOLT SUPPLY
2 B1 18DG/OR RIGHT REAR WHEEL SPEED SENSOR SIGNAL
TRACTION CONTROL SWITCH - BLACK 2 WAY
CAV CIRCUIT FUNCTION
1 B27 20DG/WT TRACTION CONTROL SWITCH SENSE
2 Z427 20BK/WT GROUND
C
O
N
N
E
C
T
O
R
P
I
N
O
U
T
S
71
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NOTES
72
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10.0 SCHEMATIC DIAGRAMS
10.1 TEVES MARK 20 ANTILOCK BRAKE SYSTEM
SCHEMATIC DIAGRAMS
S
C
H
E
M
A
T
I
C
D
I
A
G
R
A
M
S
73
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SCHEMATIC DIAGRAMS
10.2 ADJUSTABLE PEDALS SYSTEM
S
C
H
E
M
A
T
I
C
D
I
A
G
R
A
M
S
74
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