DTC 3-3-5 Fault In Lead Between TCM and ECM

3-3-5 FAULT IN LEAD BETWEEN AW 50-42 AND MOTRONIC 4.3 (MIL REQUEST)

Preconditions for DTC
^ The TCM can request activation of the MIL lamp via a signal lead to the Motronic control module. If the ECM registers a fault with the signal lead, DTC 3-3-5 is set. When the ignition is switched ON, the ECM checks if the signal lead is short circuited to voltage supply (high signal). When the engine starts, the ECM checks if the signal lead is short circuited to ground (low signal).

Substitute value
^ None.

Fault sources
^ Signal too high:
- Signal lead short circuited to voltage supply.

^ Signal too low:
- Signal lead short circuited to ground.

Fault symptoms
^ None.