Fault finding

FAULT FINDING

Follow the fault finding procedure in the sequence below:

1. Use Microcheck or TestBook and associated

corrective service to diagnose fault.

2. If Microcheck or TestBook are not available see

’Self-diagnosis function’on the following page.

3. If no fault found using Microcheck/TestBook or

self-diagnosis and the fault is of an intermittent nature, check the following:

• Security of all harness connectors to ABS components.
• Open circuits in associated wiring and sensor leads whilst flexing the harness and sensor leads.
• Internal ECU continuity between pins 2, 5, 7, 14 in C800 and the earth path pin 3 in C801. If no continuity exists replace ECU.
• Clean/check ABS ECU to body earth point.

4. If the ABS system will not communicate with

Microcheck/TestBook or display self diagnosis codes, check connections and wiring between the diagnostic socket and ECU.