Motronic/Auto Transmission Data Exchange (Can-Bus), Checking

- Check Diagnostic Trouble Code (DTC) memory for Transmission Control Module (TCM).

- Switch ignition off.





- Connect VAG 1598/19 test box to ECM harness connector. Connecting VAG 1598/19 Test Box
- Check wiring for open or short circuit between TCM and ECM/test box sockets A9 and A10.
See Electrical Wiring Diagrams, Troubleshooting and Component Locations.

If wiring is OK:
- Temporarily replace ECM and/or TCM.
- Generate readiness code. Readiness Code, Generating