Preliminary Checks

PRELIMINARY CHECKS
If a fault has occurred, or has been identified by electronic control unit (ECU) self diagnostic function and ABS warning light is illuminated, the system and components must be checked to locate and rectify fault.

NOTE: If warning lamp has indicated a fault in system, and no fault code has been stored in memory, cause of fault could be:
^ Failure in electrical supply
^ Bad ECU ground
^ Faulty warning light relay
^ ECU not connected

Before commencing fault diagnosis procedure following items must be checked:
1. Inspect all exposed cables for damage or abrasion.
2. Check ground on ABS system.
3. Battery - state of charge.
4. Check hub end-float.
5. All ABS fuses and electrical connections.


Fault rectification
1. Complete harness should be replaced if faults are found in wiring harness.
2. DO NOT use unspecified cables or connectors, as this could jeopardize safe function of ABS.
3. DO NOT attempt to open sealed 35 way connector to ECU.

NOTE:
- If ABS warning light illuminates due to large sensor air gap, fault will be retained by the ECU memory. Where wheel sensors have been pushed fully home prior to test, the ECU will indicate a fault that has been rectified.
- After any steering adjustment, bearing replacement/adjustment, brake disc replacement: Check hub end/float and sensor clearance.
- After fixing faults, clear ALL memory codes and road test vehicle.

* Testbook is not a "book" but a Land Rover diagnostic special tool.