12 51 001 Replacing wiring harness section for engine

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2006 BMW X5, 2006 BMW X3, 2005 BMW X5, 2005 BMW X3, and 2004 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Scalding hazard!
Only perform these tasks on an engine that has cooled down.

Necessary preliminary tasks:

Read out fault memory of DME control unit.
Switch off ignition.
Disconnect BATTERY NEGATIVE LEAD from battery.
Remove cover for fuel injectors.
Remove INTAKE AIR MANIFOLD .

NOTE: All illustrations show the E60 vehicle with M54 engine.

Detach plug (1) from oil lever sensor.

Fig 1: Detaching Plug From Oil Lever Sensor

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Unclip lead from cable tie (2) and lay towards top.

Unlock plug (1) and detach from pulse generator for crankshaft.

Fig 2: Unlocking Plug

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Unscrew nuts (1).

Fig 3: Removing Lines From Starter Motor

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Tightening torque 12 41 4AZ .

Remove lines (2) from starter motor.

Unlock plug (1) and detach from coolant temperature sensor.

Fig 4: Detaching Plug From Coolant Temperature Sensor

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Unlock plug (1) and detach from reverse gear switch.

Fig 5: Detaching Plug From Reverse Gear Switch

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Unclip plug connections (1) on oxygen control sensors from holders and disconnect.

Fig 6: Disconnecting Oxygen Control Sensors From Holders

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Unfasten screws.

Fig 7: Removing Electronics Box Cover

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Remove electronics box cover (1).

Installation:

Engage electronics box cover (1) correctly in hinges.

Lift cables with profile seals (1) and (2) out of partition or electronics box.

Fig 8: Disconnecting Connections In Electronics Box

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Unlock plug connections in electronics box and disconnect.

Installation:

To prevent leaks, you must install profile seals (1) and (2) correctly.

Unlock plug (1) and detach from alternator.

Fig 9: Detaching Plug From Alternator

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Unlock plug connections (1) and (2) and disconnect.

Fig 10: Unlocking Plug Connections

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Unlock plug (1) on pulse generator of inlet camshaft and detach from cable duct (2).

Fig 11: Unlocking Plug On Pulse Generator Of Inlet Camshaft

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IMPORTANT: Mark plug connections (1) of oxygen monitor sensors for cylinder banks 1-3 and 4 -6 to prevent them from being mixed up when they are installed later.

Unclip plug connections (1) from holders and disconnect.

Fig 12: Detaching Terminal Strip For Fuel Injectors From Injection Pipe

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Unlock and disconnect plug connection (3) on solenoid valve of VANOS adjustment unit.

Detach terminal strip (4) for fuel injectors from injection pipe.

Unlock plug (1) and detach from solenoid valve of VANOS adjustment unit.

Fig 13: Detaching Plugs For Pulse Generator & VANOS Adjustment Unit

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Unlock plug (2) and detach pulse generator for exhaust camshaft.

Unlock plug (1) and detach from thermostat housing.

Fig 14: Detaching Plug From Thermostat Housing

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NOTE: Interrogate fault memory of DME control unit.

Check stored fault messages.

Rectify faults.

Then clear fault memory.