Troubleshooting and Testing Requirements
Electrical Testing^ If the On Board Diagnostic (OBD) sequence does not provide any indication of the source of the malfunction, work through all of the electrical test steps.
^ If the OBD sequence identifies the source of the malfunction, only carry out the test steps recommended in the DTC table (specific testing).
Test requirements:
- "Automatic Test Sequence" carried out to establish that any malfunctions stored in Transmission Control Module (TCM) and Engine Control Module (ECM) only affect ABS/ESP.
- Connect VAS5051 tester or VAG1551 scan tool and select the address word 00 (with ignition on).
- After completing electrical testing, check and erase DTC memories of Transmission Control Module (TCM) and Engine Control Module (ECM).
- Multi-pin harness connector for ABS control module -J104- in proper condition, with no bent, broken or corroded terminals. Replace any damaged terminals using VAS1978 wiring repair kit.
Note: The instructions for the VAS1978 wiring harness repair kit generally forbids the repair of any lines in the ABS or related systems. This rule only pertains to the shielded lines in these systems.
- Ignition and electrical consumers switched off before beginning testing (headlights, lighting, fan, etc.).
- For steps 13 through 16, raise the vehicle until the wheels rotate freely. On vehicles with manual transmission put the gear shift lever in neutral. On vehicles with automatic transmission move the selector lever to position "N."
Required special tools and test equipment:
^ VAS5051 tester or VAG1551 scan tool or VAG1552 scan tool
^ VAG1598/20 test box
^ Connector test kit VAG1594
^ Multimeter (Fluke 83 or equivalent)
^ Pressure gauge VAG131 OA
Connecting VAG1598/20 test box and checking ESP system
- Switch ignition off.
- Remove ABS control module -J104-.
- Disconnect multi-pin connector from ABS control module-J104-.
- Check multi-pin connector between harness connector and ABS control module -J104-
The socket designations on the VAG1598/20 test box are identical to the terminal designations on the ABS control module -J104- and on the wiring harness connector.
Refer to Electrical Wiring Diagrams
- Connect VAG1598/20 test box to multi-pin connector of wiring harness.