12 51 100 Replacing Wiring Harness Section For Ignition Coil

12 51 100 - Replacing wiring harness section for ignition coil (N52K)





Important!
Aluminium-magnesium materials.
No steel screws/bolts may be used due to the threat of electrochemical corrosion.
A magnesium crankcase requires aluminium screws/bolts exclusively.
Aluminium screws/bolts must be replaced each time they are released.
Aluminium screws/bolts are permitted with and without color coding (blue).
For reliable identification:
Aluminium screws/bolts are not magnetic.
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 ignition coil cover Removing and Installing/Replacing Ignition Coil Cover
- Remove control unit plug Service and Repair





Release screws and remove retaining bar (1).
Unlock upper section (2) of partition seal in direction of arrow and remove.
Release grommets (3) for wiring harnesses from lower section of partition seal and from electronics box.

Installation Note:
Make sure grommets are correctly seated (watertightness).





Unlock tab (1). Pull contact carrier (2) in direction of arrow out of housing.
Unlock and disconnect all plug connections of ignition coil wiring harness section in electronics box.





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.










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