12 51 001 Replacing wiring harness section for engine (S65)
WARNING: This page is about a different car, the 2011 BMW M3, 2010 BMW M3, 2009 BMW M3, and 2008 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.
Necessary preliminary tasks
- Read out fault memory of control unit of Digital Engine Electronics (DME)
- Check stored fault messages.
- Switch off ignition
- Disconnect BATTERY
- Remove INTAKE AIR MANIFOLD
- Remove SECONDARY-AIR PUMP
- Remove ignition coil cover on left and right
- Unlock all plug connections in electronics box and disconnect
Release nuts at cable duct (1).
WIRE HARNESSING REPLACEMENT PROCEDURE
| Work step | Note: |
|---|---|
| Unlock plug on A/C compressor and disconnect | |
| Disconnect plug connection, exhaust VANOS, bank 1 | |
| Disconnect plug connection on oil pressure switch | |
| Disconnect plug connection, inlet VANOS, bank 1 | |
| Disconnect plug connections for both camshaft sensors, bank 1 | |
| Disconnect plug connections for ignition coils 1, 2 and 3 | |
| Release grounding cable | |
| Disconnect plug connection, ignition coil 4 | |
| Disconnect plug connections on injectors 1-4 | |
| Release B+ lead holder | |
| Disconnect plug connections, oxygen sensors | |
| Disconnect plug connections in electronics box | |
| Disconnect BSD lead on alternator | |
| If necessary, disconnect B+ lead on alternator | Tightening torque 12 31 1AZ . |
| Disconnect plug connection, exhaust VANOS, bank 2 | |
| Disconnect plug connection, inlet VANOS, bank 2 | |
| Disconnect plug connection, coolant temperature sensor | |
| Disconnect plug connection, extension, Hall sensor, bank 2 | |
| Disconnect plug connections for both camshaft sensors, bank 2 | |
| Disconnect plug connections for ignition coils 5, 6 and 7 | |
| Release grounding cable | |
| Disconnect plug connection for ignition coil 8 | |
| Disconnect plug connections for injectors 5-8 | |
| Disconnect plug connection for air-mass sensor, secondary air | |
| Disconnect plug connection, secondary-air pump | |
| Disconnect plug connection, throttle valve actuating motor, bank 2 | |
| Disconnect plug connection, extension, pressure sensor/starter | |
| Disconnect plug connection, throttle valve actuating motor, bank 1 | |
| Disconnect plug connection, extension, Hall sensor, bank 1 | |
| Disconnect plug connection, idle actuator | |
| Disconnect plug connection, tank venting valve |
Lower transmission See 2300018 REMOVING AND INSTALLING TRANSMISSION (GS6-53BZ) (S65) or 2800001 REMOVING AND INSTALLING TWIN CLUTCH TRANSMISSION (GS7D36SG) S65
Release bracket on underside of transmission.
Lay wiring harness, oxygen sensor plug, oil level sensor and crankshaft sensors over bracket or right catalytic converter.
Feed out cable towards top.
Remove wiring harness.
Installation:
Pay attention to cable routing/mounting points.
Now clear the fault memory.