12 51 001 Replacing wiring harness section for engine (M54)
WARNING: This page is about a different car, the 2005 BMW Z4, 2004 BMW Z4, and 2003 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.
Necessary preliminary tasks:
- Switch off ignition
- Follow Instructions For Disconnecting And Connecting Battery .
Disconnect battery negative lead and cover
- Remove intake air manifold . See 11 61 050 REMOVING AND INSTALLING INTAKE AIR MANIFOLD .
- Remove ignition coil cover .
- Remove reinforcement plate . See 51 71 374 REMOVING AND INSTALLING/REPLACING REINFORCEMENT PLATE .
WIRING HARNESS SECTION REPLACEMENT WORK STEP
| Work step | Note: |
|---|---|
| Unlock plug on oil level sensor and disconnect. See 12 61 285 Replacing Oil Level Sensor . | |
| Unlock plug on crankshaft sensor and disconnect. See 12 14 521 Replacing Pulse Generator On Crankshaft (M54/M56) | |
| Unlock plug on coolant temperature sensor and disconnect. See 13 62 531 REPLACING COOLANT TEMPERATURE SENSOR . | |
| Unlock plug on throttle valve assembly . See 13 54 030 REMOVING AND INSTALLING/SEALING THROTTLE VALVE ASSEMBLY . | |
| Unlock plugs on both solenoid valves for VANOS and disconnect. See 11 36 570 REPLACING SOLENOID VALVE FOR INLET and 11 36 575 REPLACING SOLENOID VALVE FOR EXHAUST . | |
| Unlock plugs on inlet and exhaust camshaft sensors and disconnect. See 12 14 523 Replacing Pulse Generator On Inlet Camshaft (M52TU / M54 / M56) and 12 14 524 Replacing Pulse Generator On Exhaust Camshaft (M52TU, M54, M56) . | |
| Unlock plug on oil pressure switch and disconnect. See 12 61 280 Removing And Installing/Replacing Oil Pressure Sensor (M54) . | |
| Unlock plug on knock sensors and disconnect. See 12 14 600 Replacing Knock Sensor (M52TU, M54,M56) . | |
| Unlock plug on alternator and detach battery positive lead from alternator. See 12 31 020 Removing And Installing Or Replacing Alternator (M54) . | |
| Detach battery positive lead and control lead from starter motor. See 12 41 020 Removing And Installing/Replacing Starter Motor (M54) . | |
Unlock plug connections in electronics box and disconnect:
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