DIAGNOSIS AND TESTING

Overview

Ride and handling optimization incorporates the terrain response system which links a number of modules around the vehicle to give the best combination of settings in the different systems.

For information on the description and operation of the system, refer to section 204-06 - Ride and Handling Optimization of the workshop manual.

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 tested and/or the donor vehicle.

Verify the customer concern.

Visually inspect for obvious mechanical or electrical faults.

Mechanical	Electrical
Tire condition, pressures, etc Driveline components (correct installation, damage, etc) Engine components (correct installation, damage, etc) Transmission components (correct installation, damage, etc) Suspension components (correct installation, damage, etc)	Fuses Harnesses/Connectors Terrain response module Engine control module (ECM) Transmission control module (TCM) Transfer case control module ABS control module Rear differential control module Dynamic suspension control 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.

Use the approved diagnostic system or a scan tool to retrieve any diagnostic trouble codes (DTCs) before moving onto the symptom chart or DTC index. Refer to the relevant section of the workshop manual.

Symptom chart

Because the overall function of the system is dependent on sub-systems, it is possible to misinterpret displays in the message center as being terrain response faults when they are actually a result of a fault in one of the sub-systems.

Refer to the table below for help in deciding when to investigate terrain response faults and when the fault is likely to be in a sub-system.

Symptom	Description	Possible causes	Action
Message center display indicating a sub-system fault	The message center indicates to the driver that a fault has occurred and in which sub-system	Any sub-system fault supported by the message center	For details of the available messages, refer to the relevant section of the workshop manual. Carry out a complete vehicle DTC read and follow the diagnostic routine(s) indicated.
Message center display: System fault special programs not available, terrain response switch operation normal	This message will display when a sub-system fault has occurred if the driver attempts to change the special program, and at each ignition on cycle for 5 seconds until the fault is rectified	Any sub-system fault supported by the message center	For details of the available messages, refer to the relevant section of the workshop manual. Carry out a complete vehicle DTC read and follow the diagnostic routine(s) indicated.
Message center display: System fault special programs not available, ALL terrain response switch LEDs illuminated	CAN circuit errors	CAN circuit: short circuit to ground CAN circuit: short circuit to power CAN circuit: high resistance	Carry out a complete vehicle DTC read and follow the diagnostic routine(s) indicated.
Special program changes not available	User error	Engine not running Rock crawl selected with transfer box in high range Special program change attempted with ABS or DSC active This includes ABS cycling as part of HDC Special program change attempted with an overheat condition present in the center or rear differential	Refer to the relevant section of the workshop manual. Make sure that the driver is familiar with the correct operation of the system.

DTC index

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.
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).
When performing voltage or resistance tests, always use a digital multimeter accurate to three decimal places, and with an up-to-date calibration certificate. When testing resistance always take the resistance of the digital multimeter leads into account.
When performing voltage or resistance tests, always use a digital multimeter (DMM) accurate to three decimal places and with a current calibration certificate. When testing resistance, always take the resistance of the DMM leads into account.
Check DDW for open campaigns. Refer to the corresponding bulletins and SSMs which may be valid for the specific customer complaint and carry out the recommendations as required.

DTC	Description	Possible causes	Action
C1A00-46	Control module - calibration / parameter memory failure	The terrain response control module has indicated a calibration / parameter memory failure for embedded systems using FLASH memory. This is equivalent to EEPROM in RAM/ROM/EEPROM embedded systems Corruption in the non-volatile memory storage system (EEPROM) in the terrain response control module	Rectify this DTC before attempting to rectify others. Record all DTCs logged and clear them. With ignition on select a terrain response special program, turn off the ignition, then turn back on the ignition and verify the selected special program is still active. If the selected terrain response special program is not still active and has returned to the general program, confirm if DTC has returned. Repeat procedure again once more. If DTC is still present install a new terrain response rotary control and control module.
C1A01-96	LED – component internal failure	Terrain response rotary control and control module - LED short circuit to ground Terrain response rotary control and control module - LED open circuit	NOTE: If the system is in 'failsafe default mode due to another issue no LEDs will illuminate. This fault does not cause the system to go to 'failsafe default'. Refer to the Description and Operation section of workshop manual. Check terrain response system, special program LEDs. One or more of the LEDs is suspected of not illuminating as appropriate. With the engine running move the terrain response rotary control through all five programs and confirm the appropriate special program LED does not illuminate when the terrain response rotary control is in that position. Suspect the terrain response rotary control and control module, check and install a new terrain response rotary control and control module as required, refer to the new module/component installation note at the top of the DTC Index.
C1A02-94	Rotary encoder stuck in intermediate position – unexpected operation	The terrain response rotary control is held in an intermediate position (between the special programs) for more than 60 seconds Foreign object preventing correct operation of terrain response rotary control Mechanical damage to the terrain response rotary control	Check that the terrain response control is correctly located into a detent. Using the manufacturer approved diagnostic system, clear the DTC. With the engine running check the system responds to switch rotation and the DTC does not return. Check for foreign object preventing correct operation of terrain response rotary control. Check for mechanical damage to the terrain response rotary control. Rectify as required.
U0073-88	Control module communication bus ‘A’ off – bus off	Bus off. The terrain response control module has detected the data bus is not available CAN bus open circuit CAN bus short circuit to ground CAN bus short circuit to power Failure of another control module on the CAN bus	Refer to electrical circuit diagrams, check CAN circuit for open circuit, short to ground, short to power, repair/renew as necessary. Using the manufacturer approved diagnostic system, carry out network integrity test. Check the system is operating correctly and the DTC does not return.
U0100-87	Lost communication with ECM/PCM ‘A’ – missing message	The terrain response control module has not received one or more expected messages from the engine control module High speed CAN circuit communications failure Open circuit engine control module, power feed Open circuit engine control module, ground supply Engine control module disconnected from the high speed CAN communication bus Open circuit engine control module high speed CAN low circuit Open circuit engine control module high speed CAN high circuit Engine control module not configured Engine control module failure	Using the manufacturer approved diagnostic system, check the engine control module for DTCs and refer to the relevant DTC index. Using the manufacturer approved diagnostic system, carry out network integrity test. Refer to electrical circuit diagrams, check power feed and ground supplies, to engine control module for open circuit. Check for open circuit engine control module high speed CAN low circuit. Check for open circuit engine control module high speed CAN high circuit, repair as necessary. Using the manufacturer approved diagnostic system, re-configure the engine control module. Suspect the engine control module, check and install a new engine control module as required, refer to the new module/component installation note at the top of the DTC Index. Check the system is operating correctly and the DTC does not return.
U0101-87	Lost communication with transmission control module – missing message	The terrain response control module has not received one or more expected messages from the transmission control module High speed CAN circuit communications failure Open circuit transmission control module, power feed Open circuit transmission control module, ground supply Transmission control module disconnected from the high speed CAN communication bus Open circuit transmission control module high speed CAN low circuit Open circuit transmission control module high speed CAN high circuit Transmission control module not configured Transmission control module failure	Using the manufacturer approved diagnostic system, check the transmission control module for DTCs and refer to the relevant DTC index. Using the manufacturer approved diagnostic system, carry out network integrity test. Refer to electrical circuit diagrams, check power feed and ground supplies, to transmission control module for open circuit. Check for open circuit transmission control module high speed CAN low circuit. Check for open circuit transmission control module high speed CAN high circuit, repair as necessary. Using the manufacturer approved diagnostic system, re-configure the transmission control module. Suspect the transmission control module, check and install a new transmission control module as required, refer to the new module/component installation note at the top of the DTC Index. Check the system is operating correctly and the DTC does not return.
U0102-87	Lost communication with transfer case control module - missing message	The terrain response control module has not received one or more expected messages from the transfer box control module High speed CAN circuit communications failure Open circuit transfer box control module, power feed Open circuit transfer box control module, ground supply Transfer box control module disconnected from the high speed CAN communication bus Open circuit transfer box control module high speed CAN low circuit Open circuit transfer box control module high speed CAN high circuit Transfer box control module not configured Transfer box control module failure	Using the manufacturer approved diagnostic system, check the transfer box control module for DTCs and refer to the relevant DTC index. Using the manufacturer approved diagnostic system, carry out network integrity test. Refer to electrical circuit diagrams, check power feed and ground supplies, to transfer box control module for open circuit. Check for open circuit transfer box control module high speed CAN low circuit. Check for open circuit transfer box control module high speed CAN high circuit, repair as necessary. Using the manufacturer approved diagnostic system, re-configure the transfer box control module. Suspect the transfer box control module, check and install a new transfer box control module as required, refer to the new module/component installation note at the top of the DTC Index. Check the system is operating correctly and the DTC does not return.
U0122-87	Lost communication with vehicle dynamics control module - missing message	The terrain response control module has not received one or more expected messages from the dynamic response control module High speed CAN circuit communications failure Open circuit dynamic response control module, power feed Open circuit dynamic response control module, ground supply Dynamic response control module disconnected from the high speed CAN communication bus Open circuit dynamic response control module high speed CAN low circuit Open circuit dynamic response control module high speed CAN high circuit Dynamic response control module not configured Dynamic response control module failure	Using the manufacturer approved diagnostic system, check the dynamic response control module for DTCs and refer to the relevant DTC index. Using the manufacturer approved diagnostic system, carry out network integrity test. Refer to electrical circuit diagrams, check power feed and ground supplies, to dynamic response control module for open circuit. Check for open circuit dynamic response control module high speed CAN low circuit. Check for open circuit dynamic response control module high speed CAN high circuit, repair as necessary. Using the manufacturer approved diagnostic system, re-configure the dynamic response control module. Suspect the dynamic response control module, check and install a new dynamic response control module as required, refer to the new module/component installation note at the top of the DTC Index. Check the system is operating correctly and the DTC does not return.
U0132-87	Lost communication with suspension control module ‘A’ - missing message	The terrain response control module has not received one or more expected messages from the air suspension control module High speed CAN circuit communications failure Open circuit air suspension control module, power feed Open circuit air suspension control module, ground supply Air suspension control module disconnected from the high speed CAN communication bus Open circuit air suspension control module high speed CAN low circuit Open circuit air suspension control module high speed CAN high circuit Air suspension control module not configured Air suspension control module failure	Using the manufacturer approved diagnostic system, check the air suspension control module for DTCs and refer to the relevant DTC index. Using the manufacturer approved diagnostic system, carry out network integrity test. Refer to electrical circuit diagrams, check power feed and ground supplies, to air suspension control module for open circuit. Check for open circuit air suspension control module high speed CAN low circuit. Check for open circuit air suspension control module high speed CAN high circuit, repair as necessary. Using the manufacturer approved diagnostic system, re-configure the air suspension control module. Suspect the air suspension control module, check and install a new air suspension control module as required, refer to the new module/component installation note at the top of the DTC Index. Check the system is operating correctly and the DTC does not return.
U0155-87	Lost communication with instrument panel cluster (IPC) control module - missing message	The terrain response control module has not received one or more expected messages from the instrument cluster High speed CAN circuit communications failure Open circuit instrument cluster, power feed Open circuit instrument cluster, ground supply Instrument cluster disconnected from the high speed CAN communication bus Open circuit instrument cluster high speed CAN low circuit Open circuit instrument cluster high speed CAN high circuit Instrument cluster not configured Instrument cluster failure	Using the manufacturer approved diagnostic system, check the instrument cluster for DTCs and refer to the relevant DTC index. Using the manufacturer approved diagnostic system, carry out network integrity test. Refer to electrical circuit diagrams, check power feed and ground supplies, to instrument cluster for open circuit. Check for open circuit instrument cluster high speed CAN low circuit. Check for open circuit instrument cluster high speed CAN high circuit, repair as necessary. Using the manufacturer approved diagnostic system, re-configure the instrument cluster. Suspect the instrument cluster, check and install a new instrument cluster as required, refer to the new module/component installation note at the top of the DTC Index. Check the system is operating correctly and the DTC does not return.
U0300-55	Internal control module software incompatibility - not configured	The terrain response control module has failed to recognise the correct master configuration ID from the CAN data bus master, the instrument cluster Terrain response control module not correctly configured Instrument cluster not correctly configured	Using the manufacturer approved diagnostic system, check the vehicle configuration file, rectify as necessary. Check correct software version is installed to both terrain response control module and instrument cluster, update as necessary. Check the system is operating correctly and the DTC does not return.
U0401-94	Invalid data received from ECM/PCM A - unexpected operation	The terrain response control module has detected that the engine control module component had operated in a way or at a time that it had not been commanded to operate The engine management system, engine control module is unable to support normal terrain response functionality, the terrain response system will go into default condition Engine management system fault Engine control module failure	Using the manufacturer approved diagnostic system, check the engine control module for DTCs and refer to the relevant DTC index, rectify as required. Check the system is operating correctly and the DTC does not return. Suspect the engine control module, check and install a new engine control module as required, refer to the new module/component installation note at the top of the DTC Index.
U0402-94	Invalid data received from transmission control module - unexpected operation	The terrain response control module has detected that the transmission control module component had operated in a way or at a time that it had not been commanded to operate The transmission system, transmission control module is unable to support normal terrain response functionality, the terrain response system will go into default condition Transmission system fault Transmission control module failure	Using the manufacturer approved diagnostic system, check the transmission control module for DTCs and refer to the relevant DTC index, rectify as required. Check the system is operating correctly and the DTC does not return. Suspect the transmission control module, check and install a new transmission control module as required, refer to the new module/component installation note at the top of the DTC Index.
U0403-94	Invalid data received from transfer case control module - unexpected operation	The terrain response control module has detected that the transfer box control module component had operated in a way or at a time that it had not been commanded to operate The transfer box system, transfer box control module is unable to support normal terrain response functionality, the terrain response system will go into default condition Transfer box system fault Transfer box control module failure	Using the manufacturer approved diagnostic system, check the transfer box control module for DTCs and refer to the relevant DTC index, rectify as required. Check the system is operating correctly and the DTC does not return. Suspect the transfer box control module, check and install a new transfer box control module as required, refer to the new module/component installation note at the top of the DTC Index.
U0416-94	Invalid data received from vehicle dynamics control module - unexpected operation	The terrain response control module has detected that the dynamic response control module component had operated in a way or at a time that it had not been commanded to operate The dynamic response system, dynamic response control module is unable to support normal terrain response functionality, the terrain response system will go into default condition Dynamic response system fault Dynamic response control module failure	Using the manufacturer approved diagnostic system, check the dynamic response control module for DTCs and refer to the relevant DTC index, rectify as required. Check the system is operating correctly and the DTC does not return. Suspect the dynamic response control module, check and install a new dynamic response control module as required, refer to the new module/component installation note at the top of the DTC Index.
U0421-94	Invalid data received from suspension control module A - unexpected operation	The terrain response control module has detected that the air suspension control module component had operated in a way or at a time that it had not been commanded to operate The air suspension system, air suspension control module is unable to support normal terrain response functionality, the terrain response system will go into default condition Air suspension system fault Air suspension control module failure	Using the manufacturer approved diagnostic system, check the air suspension control module for DTCs and refer to the relevant DTC index, rectify as required. Check the system is operating correctly and the DTC does not return. Suspect the air suspension control module, check and install a new air suspension control module as required, refer to the new module/component installation note at the top of the DTC Index.
U1A03-4A	Vehicle configuration parameter - incorrect component installed	The terrain response control module has detected a mismatch between the hardware connected and the hardware expected Vehicle not correctly configured Incorrect components installed for vehicle configuration	Using the manufacturer approved diagnostic system, check the vehicle configuration file, rectify as necessary. Check correct components for vehicle configuration are installed, rectify as necessary. Check the system is operating correctly and the DTC does not return.
U1A14-49	CAN initialization failure - internal electronic failure	The terrain response control module has indicated the detection of an internal circuit failure The CAN controller initialisation has failed Terrain response control module internal failure	Using the manufacturer approved diagnostic system, check correct software version is installed to terrain response control module. Suspect the terrain response control module, check and install a new terrain response control module as required, refer to the new module/component installation note at the top of the DTC Index.

Published: 19-Nov-2015

2007.0 Range Rover Sport (LS), 204-06

Ride and Handling Optimization (G553428)