12 51 100 Replacing Wiring Harness Section For Ignition Coil

12 51 100 - Replacing wiring harness section for ignition coil (N54)





Important!
Aluminium screws/bolts must be replaced each time they are released.
Aluminium screws/bolts are permitted with and without colour coding (blue).
For reliable identification:
Jointing torque and angle of rotation must be observed without fail (risk of damage).





Important!
Read and comply with notes on protection against electrostatic damage (ESD protection) 61 35 ... Notes on ESD Protection (Electro Static Discharge).





Necessary preliminary tasks:
- Read out fault memory of DME control unit
- Switch off ignition
- Disconnect battery negative lead 61 20 900 Disconnecting and Connecting Battery Negative Lead
- Remove acoustic cover Removing and Installing/Replacing Ignition Coil Cover
- Remove intake duct





Unlock fasteners (1) from below and slide upwards approx. 10 mm.
Unlock locks (2) in direction of arrow.
Remove cover (3).





Unlock plug (1) and remove.
Unlock control unit (2) and raise approx. 5 cm.





Press locking tab (1) in direction of arrow and pull contact carrier (2) out of housing.





Press locking tabs (1) in direction of arrow and pull contact carrier (2) out of housing.





Press locking tab (1) in direction of arrow and pull contact carrier (2) out of housing.





Release screws and remove cable duct (1).

Installation Note:
Replace aluminium screws.
Tightening torque 12 52 2AZ Specifications.









Note:
Check stored fault messages.
Now clear the fault memory.