DIAGNOSIS AND TESTING

Inspection and Verification

CAUTION:

Diagnosis by substitution from a donor vehicle is NOT acceptable. Substitution of control modules does not guarantee confirmation of a fault and may also cause additional faults in the vehicle being checked and/or the donor vehicle.

NOTES:

If the control module or a component is suspect and the vehicle remains under manufacturer warranty, refer to the Warranty Policy and Procedures manual (section B1.2), or determine if any prior approval programme is in operation, prior to the installation of a new module/component.
Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.

Verify the customer concern.

Visually inspect for obvious signs of mechanical or electrical damage.

Visual Inspection

Mechanical	Electrical
Tire size, condition and installation Wheel speed sensor condition and installation Steering Angle Sensor (SAS) condition and installation Yaw rate sensor and accelerometer condition and installation Hydraulic control unit (with attached ABS module) condition and installation	Fuses Harnesses and connectors Warning lamp operation Wheel speed sensors Central junction box HDC switch DSC switch Combined stop lamp switch / brake switch Yaw rate sensor and accelerometer Steering Angle Sensor (SAS) Anti-lock Braking (ABS) module Controller Area Network (CAN) circuits

If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

If the cause is not visually evident, check for Diagnostic Trouble Codes (DTCs) and refer to the DTC Index.

DTC index

NOTE:

Generic scan tools may not read the codes listed, or may read only 5-digit codes. Match the 5 digits from the scan tool to the first 5 digits of the 7-digit code listed to identify the fault (the last 2 digits give extra information read by the manufacturer-approved diagnostic system).

DTC	Description	Possible Causes	Action
C1105-67	Brake lamp control signal incorrect after event - signal incorrect after event	NOTE: The stoplamp-switch contains the brake-lamp -switch (BLS) and the brake-switch (BS) these are located within the same housing The BLS circuit and the BS circuit have failed the plausibility test Switch internal fault Circuit fault	NOTE: Check for correct operation of the stop-lamps Refer to the electrical circuit diagrams and check the ABS module circuit to the hill decent relay for fault
C1109-24	Vehicle dynamics control switch - signal stuck high	Switch internal fault Circuit short to power	NOTE: This DTC may be logged if the switch state is active for over 1 minute Check for correct switch operation. Refer to the electrical circuit diagrams and check the ABS module circuit to the centre facia switch pack / DSC switch for circuit short to power
C1A00-16	Control module - circuit voltage below threshold	Low voltage detected Circuit short to ground, open circuit or high resistance	NOTE: DTC may be stored due to a vehicle charging or starting fault Using the manufacturer approved diagnostic system check other modules for related DTCs. Check for correct vehicle battery / charging system operation. Refer to the electrical circuit diagrams and check the ABS module power (UZ) and ground circuit for fault
C1A00-17	Control module - circuit voltage above threshold	Voltage detected above preset maximum	NOTE: DTC may be stored due to battery charger use or vehicle charging fault Using the manufacturer approved diagnostic system check other modules for related DTCs. Check for correct vehicle battery and charging system operation
C1A00-1C	Control module - circuit voltage out of range	Momentary low voltage detected	NOTE: DTC may be stored due to a vehicle charging or starting fault Using the manufacturer approved diagnostic system check other modules for related DTCs. Check for correct vehicle charging system operation. Refer to the electrical circuit diagrams and check the ABS module power (UZ) and ground circuit for fault
C1A00-45	Control module - program memory failure	Module internal fault	Using the manufacturer approved diagnostic system. Clear the DTC and retest if the DTC returns suspect the ABS module. Replace as required. Refer to the new module / component installation note at the top of the DTC index
C1A00-46	Control module - calibration / parameter memory failure	Incorrect car configuration file (CCF) data received from IPC or CCF incorrectly configured Module installed to unrecognized vehicle configuration Module calibration/parameter memory failure (internal error)	Configure the module using the approved diagnostic system. Clear the DTC and check if the DTC resets after ignition reset following >10 seconds ignition on. If the possible causes listed have been checked and the DTC persists, suspect the ABS module. Replace as required. Refer to the new module / component installation note at the top of the DTC index
C1A00-49	Control module - internal electronic failure	Module internal fault	Using the manufacturer approved diagnostic system, clear the DTC and retest. If the DTC returns, suspect the ABS module. Replace as required. Refer to the new module / component installation note at the top of the DTC index
C1A00-4A	Control module - incorrect component installed	The stored vehicle variant code in the control module (EEPROM) does not match the variant code received via the CAN bus	Using the manufacturer approved diagnostic system, confirm that the stored vehicle variant code and the transmitted variant code match. Configure as required
C1A00-4B	Control module - over temperature	The control module has excided a preset maximum temperature Module internal fault	NOTE: Investigate the cause of the control module temperature event Using the manufacturer approved diagnostic system, clear the DTC and retest. If DTC returns suspect an internal fault with the ABS module. Replace as required. Refer to the new module / component installation note at the top of the DTC index
C1A00-68	Control module - event information	Control module event information	Using the manufacturer approved diagnostic system, check for DTCs relating to a defective steering angle sensor, wheel speed sensor or yaw rate sensor. Replace as required. Refer to the new module / component installation note at the top of the DTC index
C1A00-88	Control module - bus off	CAN bus circuit fault	Using the manufacturer approved diagnostic system, carry out the CAN network integrity test. Refer to the electrical circuit diagrams and check the CAN bus circuit to the ABS module for circuit short to power, short to ground, open circuit or high resistance
C1A76-01	Valve relay circuit - general electrical failure	Module internal fault	Using the manufacturer approved diagnostic system, clear the DTC and retest. If DTC returns suspect an internal fault with the ABS module. Replace as required. Refer to the new module / component installation note at the top of the DTC index
C1A76-04	Valve relay circuit - system internal failures	Module internal fault	Using the manufacturer approved diagnostic system, clear the DTC and retest. If DTC returns suspect an internal fault with the ABS module. Replace as required. Refer to the new module / component installation note at the top of the DTC index
C1A77-16	Valve relay circuit - circuit voltage below threshold	Low voltage detected Circuit fault	NOTE: DTC may be stored due to a vehicle charging or starting fault Using the manufacturer approved diagnostic system, check other modules for related DTCs. Check for correct vehicle charging system operation. Refer to the electrical circuit diagrams and check the ABS module (UBVR) power and ground circuits for fault
C1A78-04	Front left inlet valve - system internal failures	Module internal fault	Using the manufacturer approved diagnostic system, clear the DTC and retest. If the DTC returns suspect the ABS module. Replace as required. Refer to the new module / component installation note at the top of the DTC index
C1A79-04	Front left outlet valve - system internal failures	Module internal fault	Using the manufacturer approved diagnostic system, clear the DTC and retest. If the DTC returns suspect the ABS module. Replace as required. Refer to the new module / component installation note at the top of the DTC index
C1A80-04	Front right inlet valve - system internal failures	Module internal fault	Using the manufacturer approved diagnostic system, clear the DTC and retest. If the DTC returns suspect the ABS module. Replace as required. Refer to the new module / component installation note at the top of the DTC index
C1A81-04	Front right outlet valve - system internal failures	Module internal fault	Using the manufacturer approved diagnostic system, clear the DTC and retest. If the DTC returns suspect the ABS module. Replace as required. Refer to the new module / component installation note at the top of the DTC index
C1A82-04	Rear left inlet valve - system internal failures	Module internal fault	Using the manufacturer approved diagnostic system, clear the DTC and retest. If the DTC returns suspect the ABS module. Replace as required. Refer to the new module / component installation note at the top of the DTC index
C1A83-04	Rear left outlet valve - system internal failures	Module internal fault	Using the manufacturer approved diagnostic system, clear the DTC and retest. If the DTC returns suspect the ABS module. Replace as required. Refer to the new module / component installation note at the top of the DTC index
C1A84-04	Rear right inlet valve - system internal failures	Module internal fault	Using the manufacturer approved diagnostic system, clear the DTC and retest. If the DTC returns suspect the ABS module. Replace as required. Refer to the new module / component installation note at the top of the DTC index
C1A85-04	Rear right outlet valve - system internal failures	Module internal fault	Using the manufacturer approved diagnostic system, clear the DTC and retest. If the DTC returns suspect the ABS module. Replace as required. Refer to the new module / component installation note at the top of the DTC index
C1A86-04	Commutation valve #1 - system internal failures	Module internal fault	Using the manufacturer approved diagnostic system, clear the DTC and retest. If the DTC returns suspect the ABS module. Replace as required. Refer to the new module / component installation note at the top of the DTC index
C1A87-04	Commutation valve #2 - system internal failures	Module internal fault	Using the manufacturer approved diagnostic system, clear the DTC and retest. If the DTC returns suspect the ABS module. Replace as required. Refer to the new module / component installation note at the top of the DTC index
C1A88-04	High pressure switching valve #1 - system internal failures	Module internal fault	Using the manufacturer approved diagnostic system, clear the DTC and retest. If the DTC returns suspect the ABS module. Replace as required. Refer to the new module / component installation note at the top of the DTC index
C1A89-04	High pressure switching valve #2 - system internal failures	Module internal fault	Using the manufacturer approved diagnostic system, clear the DTC and retest. If the DTC returns suspect the ABS module. Replace as required. Refer to the new module / component installation note at the top of the DTC index
C1A90-12	Wheel speed sensor supply circuit - circuit short to battery	Wheel speed sensor supply circuit short to power	Refer to the electrical circuit diagrams and check the wheel speed sensor supply (DP) circuit from the ABS module for short to power
C1A91-13	Front left wheel speed sensor circuit - circuit open	Open circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the front left wheel speed sensor for open circuit
C1A91-25	Front left wheel speed sensor circuit - signal shape / waveform failure	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the front left wheel speed sensor for fault
C1A91-2F	Front left wheel speed sensor circuit - signal erratic	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the front left wheel speed sensor for fault
C1A91-36	Front left wheel speed sensor circuit - signal frequency too low	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the front left wheel speed sensor for fault
C1A91-38	Front left wheel speed sensor circuit - signal frequency incorrect	Front left wheel speed sensor reluctor ring damaged	Visually inspect the front left wheel speed sensor reluctor ring for damage. Replace as required. Refer to the new module / component installation note at the top of the DTC index
C1A91-62	Front left wheel speed sensor circuit - signal compare failure	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the front left wheel speed sensor for fault
C1A91-64	Front left wheel speed sensor circuit - signal plausibility failure	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the front left wheel speed sensor for fault
C1A91-65	Front left wheel speed sensor circuit - signal has too few transitions / events	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the front left wheel speed sensor for fault
C1A91-78	Front left wheel speed sensor circuit - alignment or adjustment incorrect	Front left wheel speed sensor to reluctor ring air gap incorrect	Check and correct the front left wheel speed sensor reluctor ring air gap
C1A92-13	Rear left wheel speed sensor circuit - circuit open	Open circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the rear left wheel speed sensor for open circuit
C1A92-25	Rear left wheel speed sensor circuit - signal shape / waveform failure	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the rear left wheel speed sensor for fault
C1A92-2F	Rear left wheel speed sensor circuit - signal erratic	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the rear left wheel speed sensor for fault
C1A92-36	Rear left wheel speed sensor circuit - signal frequency too low	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the rear left wheel speed sensor for fault
C1A92-38	Rear left wheel speed sensor circuit - signal frequency incorrect	Rear left wheel speed sensor reluctor ring damaged	Visually inspect the rear left wheel speed sensor reluctor ring for damage. Replace as required. Refer to the new module / component installation note at the top of the DTC index
C1A92-62	Rear left wheel speed sensor circuit - signal compare failure	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the rear left wheel speed sensor for fault
C1A92-64	Rear left wheel speed sensor circuit - signal plausibility failure	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the rear left wheel speed sensor for fault
C1A92-65	Rear left wheel speed sensor circuit - signal has too few transitions / events	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the rear left wheel speed sensor for fault
C1A92-78	Rear left wheel speed sensor circuit - alignment or adjustment incorrect	Rear left wheel speed sensor to reluctor ring air gap incorrect	Check and correct the rear left wheel speed sensor reluctor ring air gap
C1A93-13	Rear right wheel speed sensor circuit - circuit open	Open circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the rear right wheel speed sensor for open circuit
C1A93-25	Rear right wheel speed sensor circuit - signal shape / waveform failure	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the rear right wheel speed sensor for fault
C1A93-2F	Rear right wheel speed sensor circuit - signal erratic	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the rear right wheel speed sensor for fault
C1A93-36	Rear right wheel speed sensor circuit - signal frequency too low	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the rear right wheel speed sensor for fault
C1A93-38	Rear right wheel speed sensor circuit - signal frequency incorrect	Rear left wheel speed sensor reluctor ring damaged	Visually inspect the rear right wheel speed sensor reluctor ring for damage. Replace as required. Refer to the new module / component installation note at the top of the DTC index
C1A93-62	Rear right wheel speed sensor circuit - signal compare failure	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the rear right wheel speed sensor for fault
C1A93-64	Rear right wheel speed sensor circuit - signal plausibility failure	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the rear right wheel speed sensor for fault
C1A93-65	Rear right wheel speed sensor circuit - signal has too few transitions / events	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the rear right wheel speed sensor for fault
C1A93-78	Rear right wheel speed sensor circuit - alignment or adjustment incorrect	Rear left wheel speed sensor to reluctor ring air gap incorrect	Check and correct the rear right wheel speed sensor reluctor ring air gap
C1A94-13	Front right wheel speed sensor circuit - circuit open	Open circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the front right wheel speed sensor for open circuit
C1A94-25	Front right wheel speed sensor circuit - signal shape / waveform failure	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the front right wheel speed sensor for fault
C1A94-2F	Front right wheel speed sensor circuit - signal erratic	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the front right wheel speed sensor for fault
C1A94-36	Front right wheel speed sensor circuit - signal frequency too low	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the front right wheel speed sensor for fault
C1A94-38	Front right wheel speed sensor circuit - signal frequency incorrect	Front right wheel speed sensor reluctor ring damaged	Visually inspect the front right wheel speed sensor reluctor ring for damage. Replace as required. Refer to the new module / component installation note at the top of the DTC index
C1A94-62	Front right wheel speed sensor circuit - signal compare failure	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the front right wheel speed sensor for fault
C1A94-64	Front right wheel speed sensor circuit - signal plausibility failure	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the front right wheel speed sensor for fault
C1A94-65	Front right wheel speed sensor circuit - signal has too few transitions / events	Circuit fault Sensor internal failure Module internal fault	Refer to the electrical circuit diagrams and check the circuit between the ABS module and the front right wheel speed sensor for fault
C1A94-78	Front right wheel speed sensor circuit - alignment or adjustment incorrect	Front right wheel speed sensor to reluctor ring air gap incorrect	Check and correct the front right wheel speed sensor reluctor ring air gap
C1A95-4A	Wheel speed sensor circuit - incorrect component installed	Incorrect wheel speed sensor installed	Check the correct wheel speed sensor is installed to vehicle specification
C1A95-62	Wheel speed sensor circuit - signal compare failure	Incorrectly oriented wheel speed sensor	Locate for the incorrectly orientated wheel speed sensor. Remove and relocate correctly
C1A95-64	Wheel speed sensor circuit - signal plausibility failure	Multiple circuit faults Multiple sensor internal failures Multiple module internal failures	Refer to the electrical circuit diagrams and check the ABS module circuit to the wheel speed sensors for multiple circuit or sensor internal failures. If no individual sensor or circuit faults are evident replace the 4 wheel speed sensors. Refer to the warranty policy and procedures manual if a module / component is suspect
C1A96-24	Brake light switch circuit - signal stuck high	Stoplamp-switch (BLS) signal is Active (1)(Footbrake pedal pressed condition) for more than 60 seconds while the vehicle is not braking Stoplamp-switch circuit fault Stoplamp-switch internal fault Stoplamp-switch incorrect installation Stoplamp-switch incorrectly adjusted	Refer to Workshop Manual Section 206-09 Diagnosis and Testing GO to Pinpoint Test A. Refer to the electrical circuit diagrams and check the ABS module circuit to the stoplamp switch for circuit short to power
C1A96-62	Brake light switch circuit - signal compare failure	Signal compare failure the stoplamp-switch (BLS) and the brake-switch (BS) have shared the same output state at the same time Stoplamp-switch circuit fault Stoplamp-switch internal fault	Refer to Workshop Manual Section 206-09 Diagnosis and Testing GO to Pinpoint Test B. Refer to the electrical circuit diagrams and check the ABS module circuit to the stoplamp switch for circuit for fault
C1A96-64	Brake light switch circuit - signal plausibility failure	Signal plausibility failure the brake fluid hydraulic pressure (PS) has exceeded 10bar and the stoplamp-switch output state has not switched from Inactive (0) to Active (1)(Footbrake pedal pressed condition) Stoplamp-switch Circuit fault Stoplamp-switch internal fault Stoplamp-switch incorrect installation Stoplamp-switch incorrectly adjusted	NOTE: Check for pressure sensor DTCs C1A99-01 or C1A99-49. If either of these DTCs has been stored carry out the specified action prior to investigating DTC C1A96-64 Refer to Workshop Manual Section 206-09 Diagnosis and Testing GO to Pinpoint Test C. Refer to the electrical circuit diagrams and check the ABS module circuit to the stoplamp switch for circuit for fault
C1A97-24	Lateral accelerometer circuit - signal stuck high	The signal from the yaw rate sensor is greater than expected when the vehicle is stationary Circuit short to power	Refer to the electrical circuit diagrams and check the anti-lock (ABS) control module CAN bus circuit to the yaw rate sensor. Check the power and ground supply circuits to the yaw rate sensor also check the installation and location for security
C1A97-27	Lateral accelerometer circuit - signal rate of change above threshold	The signal from the yaw rate sensor is above the preset maximum	Refer to the electrical circuit diagrams and check the anti-lock (ABS) control module CAN bus circuit to the yaw rate sensor. Check the power and ground supply circuits to the yaw rate sensor also check the installation and location for security
C1A97-28	Lateral accelerometer circuit - signal bias level out of range / zero adjustment failure	Yaw rate sensor signal bias level out of range / zero adjustment failure	Refer to the electrical circuit diagrams and check the anti-lock (ABS) control module CAN bus circuit to the yaw rate sensor. Check the power and ground supply circuits to the yaw rate sensor also check the installation and location for security
C1A97-29	Lateral accelerometer circuit - signal invalid	The value from the yaw rate sensor is invalid	NOTE: Driving conditions such as driving in circles or a banked track may cause the DTC to log Confirm that driving style has not caused the DTC to log. Using the manufacturer approved diagnostic system. Clear the DTC and retest. Refer to the electrical circuit diagrams and check the anti-lock (ABS) control module CAN bus circuit to the yaw rate sensor. Check the power and ground supply circuits to the yaw rate sensor also check the installation and location for security
C1A97-49	Lateral accelerometer circuit - internal electronic failure	Circuit fault Sensor internal failure	Refer to the electrical circuit diagrams and check the anti-lock (ABS) control module CAN bus circuit to the yaw rate sensor. Check the power and ground supply circuits to the yaw rate sensor also check the installation and location for security
C1A97-64	Lateral accelerometer circuit - signal plausibility failure	Circuit fault Sensor internal failure	Refer to the electrical circuit diagrams and check the ABS module CAN bus circuit to the yaw rate sensor. Check the power and ground supply circuits to the yaw rate sensor also check the installation and location for security
C1A98-08	Yaw rate sensor circuit - bus signal / message failures	Circuit fault Sensor internal failure	Refer to the electrical circuit diagrams and check the ABS module CAN bus circuit to the yaw rate sensor. Check the power and ground supply circuits to the yaw rate sensor also check the installation and location for security
C1A98-22	Yaw rate sensor circuit - signal amplitude > maximum	Circuit fault Sensor internal failure	Refer to the electrical circuit diagrams and check the ABS module CAN bus circuit to the yaw rate sensor. Check the power and ground supply circuits to the yaw rate sensor also check the installation and location for security
C1A98-28	Yaw rate sensor circuit - signal bias level out of range / zero adjustment failure	Circuit fault Sensor internal failure	Refer to the electrical circuit diagrams and check the ABS module CAN bus circuit to the yaw rate sensor. Check the power and ground supply circuits to the yaw rate sensor also check the installation and location for security
C1A98-29	Yaw rate sensor circuit - signal invalid	Circuit fault Sensor internal failure	Refer to the electrical circuit diagrams and check the ABS module CAN bus circuit to the yaw rate sensor. Check the power and ground supply circuits to the yaw rate sensor also check the installation and location for security
C1A98-61	Yaw rate sensor circuit - signal calculation failure	Circuit fault Sensor internal failure	Refer to the electrical circuit diagrams and check the ABS module CAN bus circuit to the yaw rate sensor. Check the power and ground supply circuits to the yaw rate sensor also check the installation and location for security
C1A98-62	Yaw rate sensor circuit - signal compare failure	Circuit fault Sensor internal failure	Refer to the electrical circuit diagrams and check the ABS module CAN bus circuit to the yaw rate sensor. Check the power and ground supply circuits to the yaw rate sensor also check the installation and location for security
C1A98-64	Yaw rate sensor circuit - signal plausibility failure	Circuit fault Sensor internal failure	Refer to the electrical circuit diagrams and check the ABS module CAN bus circuit to the yaw rate sensor. Check the power and ground supply circuits to the yaw rate sensor also check the installation and location for security
C1A98-86	Yaw rate sensor circuit - signal invalid	Circuit fault Sensor internal failure	Refer to the electrical circuit diagrams and check the ABS module CAN bus circuit to the yaw rate sensor. Check the power and ground supply circuits to the yaw rate sensor also check the installation and location for security
C1A98-87	Yaw rate sensor circuit - missing message	Circuit fault Sensor internal failure	Refer to the electrical circuit diagrams and check the ABS module CAN bus circuit to the yaw rate sensor. Check the power and ground supply circuits to the yaw rate sensor also check the installation and location for security
C1A98-92	Yaw rate sensor circuit - performance or incorrect operation	Circuit fault Sensor internal failure	Refer to the electrical circuit diagrams and check the ABS module CAN bus circuit to the yaw rate sensor. Check the power and ground supply circuits to the yaw rate sensor also check the installation and location for security
C1A98-95	Yaw rate sensor circuit - incorrect assembly	Incorrect component installed	Confirm the correct yaw rate sensor. is installed to vehicle specification
C1A98-96	Yaw rate sensor circuit - component internal failure	Sensor internal failure	Refer to the electrical circuit diagrams and check the ABS module CAN bus circuit to the yaw rate sensor. Check the power and ground supply circuits to the yaw rate sensor also check the installation and location for security
C1A99-01	Pressure sensor circuit - general electrical failure	ABS module internal failure	Using the manufacturer approved diagnostic system clear the DTC and retest. If the DTC returns suspect the ABS module. Replace as required. Refer to the warranty policy and procedures manual if a module / component is suspect
C1A99-49	Control module - internal electronic failure	ABS module internal failure	Using the manufacturer approved diagnostic system clear the DTC and retest. If the DTC returns suspect the ABS module. Replace as required. Refer to the warranty policy and procedures manual if a module / component is suspect
C1B00-27	Steering angle sensor -signal rate of change above threshold	Steering angle sensor internal failure	Using the manufacturer approved diagnostic system, check the steering angle sensor module for related stored DTCs
C1B00-29	Steering angle sensor - signal invalid	Steering angle sensor internal failure	Using the manufacturer approved diagnostic system, check the steering angle sensor module for related stored DTCs
C1B00-61	Steering angle sensor - signal calculation failure	Steering angle sensor internal failure	Using the manufacturer approved diagnostic system, check the steering angle sensor module for related stored DTCs
C1B00-64	Steering angle sensor - signal plausibility failure	Steering angle sensor internal failure	Using the manufacturer approved diagnostic system, check the steering angle sensor module for related stored DTCs
C1B00-92	Steering angle sensor - performance or incorrect operation	Steering angle sensor internal failure	Using the manufacturer approved diagnostic system, check the steering angle sensor module for related stored DTCs
C1B02-01	Return pump circuit - general electrical failure	ABS module internal failure	Suspect the ABS module. Replace as required. Refer to the warranty policy and procedures manual if a module / component is suspect
C1B02-16	Return pump circuit - circuit voltage below threshold	Return pump circuit voltage below threshold	Refer to the electrical circuit diagrams and check the ABS module for battery voltage at the fused supply (UBMR) circuit
C1B02-49	Return pump circuit - internal electronic failure	ABS module internal failure	Using the manufacturer approved diagnostic system clear the DTC and retest. If the DTC returns suspect the ABS module. Replace as required. Refer to the warranty policy and procedures manual if a module / component is suspect
C1B22-24	Hill descent switch - signal stuck high	Circuit short to power	NOTE: This DTC may be logged if the switch is pressed for over 1 minute Check for correct hill decent switch operation. Refer to the electrical circuit diagrams and check the Centre-console switch-pack / Hill-decent Switch circuit for short to power
C2009-95	Front axle wheel speed sensors swapped - incorrect assembly	Incorrect component installed	Correctly relocate the front wheel speed sensors
C200A-95	Rear axle wheel speed sensors swapped - incorrect assembly	Incorrect component installed	Correctly relocate the rear wheel speed sensors
U0100-87	Lost communication with ECM/PCM “A” - missing message	Missing message from the engine control module	Refer to the electrical circuit diagrams and check the power, ground and CAN bus connections to the module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Check the engine control module for related stored DTCs
U0101-87	Lost communication with TCM - missing message	Missing message from the transmission control module	Refer to the electrical circuit diagrams and check the power, ground and CAN bus connections to the module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Check the transmission control module for related stored DTCs
U0102-87	Lost communication with transfer case control module - missing message	Missing message from the transfer case control module	Refer to the electrical circuit diagrams and check the power, ground and CAN bus connections to the module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Check the transfer case control module for related stored DTCs
U0104-87	Lost communication with cruise control module - missing message	Missing message from the adaptive cruise control module	Refer to the electrical circuit diagrams and check the power, ground and CAN bus connections to the module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Check the adaptive cruise control module for related stored DTCs
U0126-87	Lost communication with steering angle sensor module - missing message	Missing message from the steering angle sensor module	Refer to the electrical circuit diagrams and check the power, ground and CAN bus connections to the module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Check the steering angle sensor module for related stored DTCs
U0128-87	Lost communication with park brake control module - missing message	Missing message from the park brake control module	Refer to the electrical circuit diagrams and check the power, ground and CAN bus connections to the module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Check the park brake control module for related stored DTCs
U0132-87	Lost communication with ride level control module - missing message	Missing message from the air suspension control module	Refer to the electrical circuit diagrams and check the power, ground and CAN bus connections to the module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Check the air suspension control module for related stored DTCs
U0133-87	Lost communication with active roll control module - missing message	Missing message from the dynamic response module	Refer to the electrical circuit diagrams and check the power, ground and CAN bus connections to the module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Check the dynamic response module for related stored DTCs
U0136-87	Lost communication with differential control module - rear - missing message	Missing message from the rear differential control module	Refer to the electrical circuit diagrams and check the power, ground and CAN bus connections to the module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Check the rear differential control module for related stored DTCs
U0138-87	Lost communication with all terrain control module - missing message	Missing message from the terrain response control module	Refer to the electrical circuit diagrams and check the power, ground and CAN bus connections to the module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Check the terrain response control module for related stored DTCs
U0155-87	Lost communication with instrument panel cluster (IPC) control module - missing message	Missing message from the instrument panel cluster control module	Refer to the electrical circuit diagrams and check the power, ground and CAN bus connections to the module. Using the manufacturer approved diagnostic system, complete a CAN network integrity test. Check the instrument panel cluster control module for related stored DTCs
U0401-68	Invalid data received from ECM/PCM - event information	Invalid data received from the engine control module	Using the manufacturer approved diagnostic system check the engine control module for related stored DTCs
U0402-68	Invalid data received from transmission control module - event information	Invalid data received from the transmission control module	Using the manufacturer approved diagnostic system check the transmission control module for related stored DTCs
U0403-68	Invalid data received from transfer case control module - event information	Invalid data received from the transfer case control module	Using the manufacturer approved diagnostic system check the transfer case control module for related stored DTCs
U0405-68	Invalid data received from cruise control module - event information	Invalid data received from the adaptive cruise control module	Using the manufacturer approved diagnostic system check the adaptive cruise control module for related stored DTCs
U0417-68	Invalid data received from park brake control module - event information	Invalid data received from the park brake control module	Using the manufacturer approved diagnostic system check the park brake control module for related stored DTCs
U0421-68	Invalid data received from ride level control module - event information	Invalid data received from the air suspension control module	Using the manufacturer approved diagnostic system check the air suspension control module for related stored DTCs
U0428-68	Invalid data received from steering angle sensor module - event information	Invalid data received from the steering angle sensor module	Using the manufacturer approved diagnostic system check the steering angle sensor module for related stored DTCs
U1A49-68	Invalid data received from all terrain control module - event information	Invalid data received from the terrain response control module	Using the manufacturer approved diagnostic system check the terrain response control module for related stored DTCs
U1A4A-68	Invalid data received from differential control module - rear - event information	Invalid data received from the rear differential control module	Using the manufacturer approved diagnostic system check the rear differential control module for related stored DTCs
U2001-68	Reduced system function - event information	NOTE: Not a fault condition. System operation suspended while system cools. Customer may have seen the warning lamp illuminated during a period of reduced functionality or may have noticed the vehicle behaving differently in relation to a traction control event Event information	NOTE: This DTC is stored if the control module reduces the level of functionality, to prevent over-heating of the foundation brakes. This is a normal function of the ECU and is not a fault Clear / ignore this DTC
U3000-55	Control module - not configured	Mismatch with master configure ID	Check the correct ABS module is installed to vehicle specification. Check that the Central Broadcast VIN matches the vehicle VIN. Refit the original module or replace as required

Pinpoint Tests

PINPOINT TEST A : STOPLAMP-SWITCH PLAUSIBILITY FAULT (DTC C1A96-24)
A1: CUSTOMER INDUCED DTC
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
NOTES: These tests are to be carried out if DTC C1A96-24 has been stored. This DTC indicates plausibility – The stoplamp-switch signal is high (Footbrake pedal pressed condition) while the vehicle is not braking. Plausibility detail – A DTC will be stored if the stoplamp-switch signal is high for more than 60 seconds while the accelerator pedal is pressed and the vehicle speed is greater than 7 mph/10.8 km/h and the ABS Module is not actively controlling pressure.
	1 Confirm that the fault is not being provoked by a customer driving habit (Resting a foot on the brake pedal while accelerating / cruising).
	Is the fault being provoked by a customer driving habit? Yes Advise the customer that the cause of the DTC being stored maybe due to his/her foot resting on the brake pedal whilst the vehicle is in motion. Clear the stored DTC, operate the footbrake and check for correct stoplamp operation. No GO to A2.

A2: STOPLAMP-SWITCH ADJUSTMENT CHECK
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
NOTE: Removal and correct installation of the stoplamp-switch will reset the adjustment. Ensure the footbrake pedal is fully raised against its upstop, (pedal rest position) when installing the stoplamp-switch.
	1 Check that the stoplamp-switch is securely installed and correctly adjusted. REFER to: Stoplamp Switch (417-01 Exterior Lighting, Removal and Installation).
	Is the stoplamp-switch securely installed and correctly adjusted? Yes GO to A3. No Adjust the stoplamp-switch using the approved process. Clear the stored DTC, operate the Footbrake and check for correct stoplamp operation.

A3: STOPLAMP CIRCUIT SHORT TO POWER
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
NOTE: If a circuit short to power is present the stoplamps may be illuminated (Footbrake Pedal released).
	1 Using the manufacturer approved diagnostic system, monitor the Data Logger Signal, PID-2B00 (brake input switch status - brake pedal switch / brake lamp switch), set the Ignition-state to the on position and with the footbrake released PID-2B00 (brake input switch status) should show Inactive (BLS = 0).
	Does PID-2B00 (brake input switch status) show Inactive (BLS =0)? Yes GO to A4. No Refer to electrical circuit diagrams to locate the fault. Repair the circuit as required using the approved process. Clear the stored DTC, operate the Footbrake and check for correct stoplamp operation.

A4: SHORT CIRCUIT TO ANOTHER POWER CIRCUIT
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
NOTE: A short circuit to another circuit will cause the DTC to log in the ABS Module.
	1 Using the manufacturer approved diagnostic system, monitor the Data-logger signal, PID-2B00 (brake input switch status - brake pedal switch / brake lamp switch), set the Ignition-state to the on position and with the footbrake released PID-2B00 (brake input switch status) should show Inactive (BLS = 0).
	2 Operate any electrical circuits that could supply a voltage to the stoplamp-switch circuit.
	Does PID-2B00 (brake input switch status) show Inactive (BLS =0)? Yes Suspect an intermittent fault. Carry out visual and mechanical check of splice joints, all connectors and cables, check for corrosion, bent or damaged contact faces of pins, terminals and for security of connectors. Where possible flex cables while using the manufacturer approved diagnostic system to monitor the Data-logger signal, PID-2B00 (brake input switch status - brake pedal switch / brake lamp switch). This test should be carried out with the ignition on and the footbrake pedal in the released position. BLS should remain Inactive (BLS=0). No Refer to electrical circuit diagrams to locate the fault. Repair the circuit as required using the approved process. Clear the stored DTC, operate the footbrake and check for correct stoplamp operation.

Pinpoint Tests

PINPOINT TEST B : SIGNAL COMPARE PLAUSIBILITY (DTC C1A96-62)
B1: STOPLAMP-SWITCH CIRCUIT
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
NOTES: These tests are to be carried out if DTC C1A96-62 signal compare - plausibility, has been stored. This DTC indicates that the brake lamp switch and brake switch have shared the same state (both switches in the open circuit condition at the same time). The stoplamp switch contains the brake-lamp switch (BLS) and the brake-switch (BS) these are located within the same housing. Signal compare - plausibility: Brake lamp switch and brake switch must not be open circuit at the same time. The datalogger-signals represent the position of the stoplamp switch. Both the brake lamp switch (BLS) and the brake switch (BS) are shown as active with the footbrake pressed and inactive with the footbrake released. This does not directly reflect the state of the stoplamp switch internal switch contacts as shown in the circuit diagrams.
	1 Using the manufacturer approved diagnostic system, monitor the data-logger signal, PID-2B00 (brake input switch status - brake pedal switch / brake lamp switch) and PID-2B00 (brake input switch status - brake pedal switch /brake switch) inputs while the footbrake pedal is slowly pressed & released.
	2 BLS = Brake Pedal Switch (brake lamp switch), BS = Brake Pedal Switch (brake switch). The correct inputs should be, pedal released BLS = Inactive (BLS = 0), BS = Inactive (BS = 0). Brief transition (as the pedal is pressed BLS = Active (BLS = 1), BS = Inactive (BS = 0). Pedal pressed BLS = Active (BLS = 1), BS = Active (BS = 1). If either input remains inactive during the test procedure a fault is evident.
	Did the inputs show correctly? Yes Suspect an intermittent fault. Carry out visual and mechanical check of splice joints, all connectors and cables, check for corrosion, bent or damaged contact faces of pins, terminals and for security of connectors. Where possible flex cables while using the manufacturer approved diagnostic system, monitor the data-logger signal, PID-2B00 (brake input switch status - brake pedal switch / brake lamp switch) and PID-2B00 (brake input switch status - brake pedal switch /brake switch). This test should be carried out with the stoplamp-switch in both the pressed and released position independently. Refer to electrical circuit diagrams to locate the intermittent open circuit. Repair the circuit as required using the approved process. Clear the stored DTC, operate the footbrake and check for correct stoplamp operation. No GO to B2.

B2: STOPLAMP-SWITCH CIRCUIT 2
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
	1 If BLS = Inactive (0) BS = Active (1) occurred with the footbrake released the fault is with the (BS) = Brake Pedal Switch (brake switch) circuit. If BLS = Inactive (0) BS = Active (1) occurred with the footbrake pressed the fault is with the (BLS) = Brake-pedal switch (brake lamp switch) circuit.
	Did BLS (brake lamp switch) = Inactive (0) BS (brake switch) = Active (1) occur with the footbrake released? Yes Suspect a stoplamp-switch (brake switch) circuit fault. Refer to electrical circuit diagrams and replace blown fuse or locate the open circuit. Repair the circuit as required using the approved process. Clear the stored DTC, operate the footbrake and check for correct stoplamp operation. No Suspect a stoplamp-switch (brake lamp switch) circuit fault. Refer to electrical circuit diagrams and replace blown fuse or locate the open circuit. Repair the circuit as required using the approved process. Clear the stored DTC, operate the footbrake and check for correct stoplamp operation.

PINPOINT TEST C : PLAUSIBILITY – STOPLAMP-SWITCH (BLS) VERSES BRAKE PRESSURE (PS) (DTC C1A96-64)
C1: IDS MONITOR
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
NOTES: These tests are to be carried out if DTC C1A96-64 plausibility – Stoplamp-switch (BLS) verses brake fluid hydraulic pressure (PS) has been stored. This DTC indicates plausibility – the stoplamp-switch must be seen to operate before brake fluid hydraulic pressure (PS) exceeds a pressure threshold of 10 Bar. The stoplamp-switch status is monitored by the ABS module (BLS terminal 30). The ABS module contains an internal pressure sensor and monitors the brake fluid hydraulic pressure (PS).
	1 Using the manufacturer approved diagnostic system, check for ABS module pressure sensor DTCs C1A99-01 or C1A99-49. If either of these DTCs has been stored carry out the specified action prior to investigating DTC C1A96-64.
	2 Using the manufacturer approved diagnostic system, monitor the data-logger signal PID-2B00 (brake input switch status - brake pedal switch / brake lamp switch) and PID-2B0D (brake fluid hydraulic pressure) . When the brake pedal is pressed, the (brake-pedal switch / brake lamp switch) status should change from Inactive (BLS = 0) to Active (BLS = 1) before the brake fluid hydraulic pressure reaches 1000KPa (10 Bar).
	Does the (brake pedal switch / brake lamp switch) change from Inactive (BLS = 0) to Active (BLS = 1) before the brake fluid hydraulic pressure reaches 1000KPa (10 Bar)? Yes Suspect an intermittent brake-lamp switch circuit fault. Refer to electrical circuit diagrams, carry out visual and mechanical check of the of splice joints, connectors and cables of the stoplamp-switch circuit, check for corrosion, bent or damaged contact faces of pins, terminals and for security of connectors. Where possible flex cables to attempt to induce the intermittent open circuit. Repair the circuit as required using the approved process. Clear the stored DTC, operate the Footbrake and check for correct stoplamp operation. No GO to C2.

C2: STOPLAMP-SWITCH ADJUSTMENT CHECK
TEST CONDITIONS	DETAILS/RESULTS/ACTIONS
NOTE: Removal and correct installation of the stoplamp-switch will reset the adjustment. Ensure the footbrake pedal is fully raised against its upstop, (pedal rest position) when installing the stoplamp switch.
	1 Check that the stoplamp-switch is securely installed and correctly adjusted. REFER to: Stoplamp Switch (417-01 Exterior Lighting, Removal and Installation).
	Is the fault still present with the stoplamp-switch securely installed and correctly adjusted? Yes Suspect a brake-lamp switch circuit fault. Refer to electrical circuit diagrams, carry out visual and mechanical check of the splice joints, connectors and cables of the stoplamp-switch circuit, check for corrosion, bent or damaged contact faces of pins, terminals and for security of connectors. Repair the circuit as required using the approved process. Clear the stored DTC, operate the Footbrake and check for correct stoplamp operation. No Adjust the stoplamp-switch using the approved process. Clear the stored DTC, operate the footbrake and check for correct stoplamp operation.

Published: 11-May-2011

2007.0 Range Rover Sport (LS), 206-09A

Anti-Lock Control - Traction Control (G1345109)