Test Point 27

TEST POINT 27
CAN timeout

DTC 100

Fault Effect: Reduced driving program.

Notes:
- The Tiptronic control module is connected with the DmE control module via a data lead (CAN bus).
- Never pull off or push on the control module connector with the ignition switched ON.

If the DmE control module connector, for example, is pulled off with the ignition switched ON, the onboard diagnostic system may detect a "CAN timeout" fault under certain circumstances.

1. Read out the DmE fault memory. If the fault "CAN timeout" is stored here as well, check the wiring from the Tiptronic control module to the DmE control module.

2. Check wiring from Tiptronic control module pin 85 (or 86) to the DmE control module pin 85 (or 86) for continuity, short to ground and short to B+.

Note: If the wiring is OK and the fault is stored in one control module only, the fault can lie in another control module.