DTC 3-3-5

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.

TESTING PROCEDURE





Status Message
^ Check current status message.

If Status message is: Permanent fault, signal too high:
- Proceed to: PERMANENT FAULT, SIGNAL TOO HIGH section below.
If Status message is: Permanent fault, signal too low:
- Proceed to: PERMANENT FAULT, SIGNAL TOO LOW section below.
If Status message is: Intermittent fault, signal too high:
- Proceed to: INTERMITTENT FAULT, SIGNAL TOO HIGH section below.
If Status message is: Intermittent fault, signal too low:
- Proceed to: INTERMITTENT FAULT, SIGNAL TOO LOW section below.

PERMANENT FAULT, SIGNAL TOO HIGH





Check of Lead
^ Check the lead between ECM B26 and TCM B15 for signs of short circuiting to voltage.

PERMANENT FAULT, SIGNAL TOO LOW





Check of Lead
^ Check the lead between ECM B26 and TCM B15 for signs of short circuiting to ground.

INTERMITTENT FAULT, SIGNAL TOO HIGH





Check of Lead
^ Check the lead between ECM B26 and TCM B15 for signs of intermittent short circuiting to voltage supply.

INTERMITTENT FAULT, SIGNAL TOO LOW





Check of Lead
^ Check the lead between ECM B26 and TCM B15 for signs of intermillent short circuiting to ground.