Trouble Shooting and Testing Requirements

Electrical testing
^ If the On Board Diagnostic (OBD) does not give any indication of the source of the malfunction, work through the complete Electrical testing.
^ If the On Board Diagnostic (OBD) provides a direct indication of the source of the malfunction, only carry out the test steps recommended in the DTC table (specific testing).

Requirements for test
- An Automatic test sequence must first be performed to establish that any malfunctions present in the transmission and engine control modules can only originate from the ABS.
- Connect VAG 1551 scan tool and select address word 00 with ignition switched on.
- After completing the Electrical testing, check and erase the DTC memories of the transmission and engine control modules.





- The multi-pin connector between the wiring harness and ABS control module (w/EDL) -J104- must be in proper condition, without bent, broken or corroded contacts. Replace any damaged contacts using VAS 1978 wiring repair kit.

Note: The instructions supplied with VAS 1978 wiring repair kit normally do not permit repairs to the wiring of the ABS and associated systems. However, this only applies to the screened wiring in the system.

- Switch ignition and electrical consumers off before commencing the check (headlights, lighting, fan, etc.).
- For test steps 13 to 16 raise the vehicle so that the wheels can turn freely. On vehicles with manual transmission put the gear shift in neutral. On vehicles with automatic transmission move the selector lever to position "N".

The following test equipment is required:
^ VAG 1551 scan tool or VAG 1552 scan tool
^ VAG 1598 test box/20
^ VAG 1594 auxiliary test set
^ VAG 1526 tester hand-held multimeter
^ VAG 1310 A pressure gauge