Table of signs of malfunction of movement and controllability (Discovery 3)

Review

The ride and handling optimisation feature includes a terrain response system that links a number of modules throughout the vehicle to provide the best combination of settings across the various systems.

For a detailed description of the system design and operation, refer to Section 204-06 - "Ride and Handling Optimization Function" in the Service Station Manual.

Inspection and verification

1. Ensure that the customer's complaint is valid.

2. Visually inspect for obvious mechanical and electrical problems.

Mechanical factors	Electrical factors
Condition of tires, tire pressure, etc. Transmission elements (correct installation, damage, etc.) Engine components (correct installation, damage, etc.) Gearbox components (correct installation, damage, etc.) Suspension elements (correct installation, damage, etc.)	Fuses and fuses Wiring harnesses and electrical connectors Terrain Response System Module Engine Control Module (ECM) Transmission Control Module (TCM) Transfer Case Control Module ABS control module Rear Differential Control Module Dynamic Suspension Control Module CAN electrical circuits (Control Area Network)

3. If an obvious cause for a problem you have identified or a problem described by the customer is found, resolve it before moving on to further action. (if possible).

4. Use an approved diagnostic system or scanning device (tester) to extract all diagnostic trouble Codes (DTCs) before accessing the fault table or DTC index. Refer to the corresponding section in the service station manual.

Table of signs of malfunction

Since the overall performance of the system depends on the subsystems, it is possible to mistakenly perceive indications in the message center as a message about a terrain response system malfunction, when in fact the messages are the result of a malfunction in one of the subsystems.

When you are investigating faults in the terrain response system and when the fault is likely to be in a subsystem, refer to the table below to help you make your decision.

Sign of malfunction	Description	Possible reasons	Action
Message center indication of a subsystem failure	The message center shows the driver that a fault has occurred and indicates which subsystem	Any failure in the subsystem is supported by the message center	For a list of available messages, refer to the appropriate section in the workshop manual. Perform a full DTC readout for the vehicle and follow the specified diagnostic program. (programs).
Message Center Display: No special programs for system malfunctions, Terrain Response System switch operating normally	This message will be displayed when a fault has occurred in a subsystem, if the driver attempts to change a special program, and at each ignition cycle for 5 seconds until the fault is corrected.	Any failure in the subsystem is supported by the message center	For a list of available messages, refer to the appropriate section in the workshop manual. Perform a full DTC readout for the vehicle and follow the specified diagnostic program. (programs).
Message Center Display: No special programs for system malfunctions, LEDs in Terrain Response System switch not working	This message combination will be displayed when a fault has occurred in the Terrain Response System module or switch, if the driver attempts to change a special program, and at each ignition cycle for 5 seconds until the fault is corrected.	Terrain Response Module Malfunction Terrain Response system switch malfunction	Check for DTCs (please refer to the Index given below). Follow the diagnostic program provided.
Message Center Display: No special programs for system faults, ALL LEDs in Terrain Response Switch are lit	Errors in the CAN electrical circuit	CAN electrical circuit: short circuit to ground CAN electrical circuit: short circuit to battery + CAN Electrical Circuit: High Resistance	Perform a full DTC reading for the vehicle and follow the diagnostic program provided. (programs).
No changes to special programs are envisaged.	User error	The engine is not working Slow movement on rocky ground, selected with the transfer case in high range An attempt to change a special program was made with the ABS or DSC system on This includes cyclic operation of the ABS as part of HDC Attempt to change special program made when center or rear differential overheats	Refer to the relevant section in the workshop manual. Ensure that the driver is familiar with the correct operation of the system.