Replacing Wiring Harness Section for Ignition Coils (M54)

12 51 100 - Replacing wiring harness section for ignition coils (M54)





Necessary preliminary tasks:
- Read out fault memory of DME control unit.
- Switch off ignition.
- Disconnect battery negative lead from battery.
Follow instructions for disconnecting and connecting battery Instructions for Disconnecting and Connecting Battery.
- Remove cover for ignition coils.
- Remove lower section of microfilter housing on right Removing and Installing/Replacing Left or Right Microfilter Housing Lower Section.





Unfasten screws.
Remove electronics box cover (1).

Installation:
Engage electronics box cover (1) correctly in hinges.





Unlock plug (1) and detach from DME control unit.
Lift wiring harness with profile seals (2) out of partition or electronics box.

Installation:
To prevent leaks, you must install profile seals (2) correctly.

Unlock and disconnect plug (3).





Detach grounding strap (2) of cable duct from connecting plates(1) of ignition coils.





Unlock plug (1) and detach from ignition coils.
Unlock cable strip (2) and remove towards top.





Note:
Interrogate fault memory of DME control unit.
Check stored fault messages.
Rectify faults.
Then clear fault memory.