12 51 001 Replacing wiring harness section for engine (M60, M62): Installation

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 BMW 540i, 2002 BMW 540i, 2001 BMW 540i, 2000 BMW 540i, and 1999 BMW 540i. However, it is still accessible from the selected car via links, so may be relevant.

Position acoustic cover and press downwards until press-stud fasteners (1...4) click into place.

Fig 1: Identifying Acoustic Cover With Press-Stud Fastener

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Unfasten clips (1).

If fitted, unfasten hose clip (2) on air intake hose for air pump.

Disconnect plug-in connection (3).

Unfasten hose clip (4).

M62: Disconnect plug connection on temperature sensor for intake air.

Remove upper section of suction filter housing with mass air flow sensor.

Fig 2: Removing Upper Section Of Suction Filter Housing

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Remove left and right cover from ignition coils.

Fig 3: Removing Left And Right Cover From Ignition Coils

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Unfasten left and right connections on ignition coils.

Fig 4: Removing Left And Right Connections On Ignition Coils

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Remove accelerator cables (1 and 2).

Accelerator pedal
Cruise control

Fig 5: Removing Accelerator Cables

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Unfasten screw connection on oil filter housing.

Fig 6: Identifying Screw Connection On Oil Filter Housing

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Disconnect plug connection on oil pressure switch.

Fig 7: Disconnecting Plug Connection On Oil Pressure Switch

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Place oil filter housing to one side.

Fig 8: Placing Oil Filter Housing To One Side

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Cut connections on alternator.

Fig 9: Identifying Connections On Alternator

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Connections here illustrated on removed alternator.

Unfasten plug connection (1).

Unfasten nut (2).

Tightening torque, see 12 31 1AZ in ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUE .

Fig 10: Identifying Plug Connection

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Unfasten plug connections to Lambda oxygen sensors on both sides.

Fig 11: Identifying Plug Connections To Lambda Oxygen Sensors On Both Sides

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Installation

Note line routing of Lambda oxygen sensor (1) under the heat shield!

Fig 12: Identifying Lambda Oxygen Sensor

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Disconnect plug connection on reversing light switch. Note wire routing!

Fig 13: Disconnecting Plug Connection On Reversing Light Switch

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Unfasten nuts on starter motor wires.

Tightening torque, see 12 41 4AZ in ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUE .

Fig 14: Locating Nuts On Starter Motor Wires

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Unfasten plug connection on oil level switch.

Fig 15: Identifying Plug Connection On Oil Level Switch

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Unfasten plug connection on cable duct (1 to 3).

Knock sensor cylinders (3 and 4)
Knock sensor cylinders (1 and 2)
Pulse generator for TDC on vibration damper on the crankshaft

Fig 16: Identifying Plug Connection On Cable Duct

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Only M60 B30:

Disconnect plug connection (1) on solenoid valve for air accumulator.

Fig 17: Disconnecting Plug Connection On Solenoid Valve For Air Accumulator

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Press down retaining bracket.

Pull off connectors.

Fig 18: Pressing Down Retaining Bracket

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Unfasten plug connection on cable duct (1 to 3).

Knock sensor cylinders (7 and 8)
Knock sensor cylinders (5 and 6)
Sensor for cylinder recognition (camshaft sensor)

Fig 19: Identifying Plug Connection On Cable Duct

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Disconnect plug connection (1) on tank vent valve.

Fig 20: Disconnecting Plug Connection On Tank Vent Valve

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Unclip wire from brackets on protective tube (1) of positive battery lead.

Fig 21: Unclipping Wire From Brackets On Protective Tube Of Positive Battery Lead

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Disconnect plug connection (1) on idle speed adjuster and plug connection (2) on throttle valve potentiometer.

Fig 22: Disconnecting Plug Connection On Idle Speed Adjuster

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Disconnect plug connection on throttle valve potentiometer for ASC+T.

Fig 23: Disconnecting Plug Connection On Throttle Valve Potentiometer

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Unclip lines on guide tube (1) for dipstick.

Fig 24: Unclipping Lines On Guide Tube For Dipstick (1 Of 2)

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Unclip lines on guide tube (1) for dipstick.

Fig 25: Unclipping Lines On Guide Tube For Dipstick (2 Of 2)

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Unclip wire on front of upper section of oil pan.

Fig 26: Unclipping Wire On Front Of Upper Section Of Oil Pan

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Disconnect plug connection on rear of water box (1 to 3).

Temperature sensor for coolant for DME (white)
Temperature sensor for remote thermometer (black)
Ground connection of ignition coils (terminal 4a)

Fig 27: Identifying Temperature Sensor

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Ground connections (1), unfasten nuts.

Unclip diagnosis connector (2) from bracket.

Unfasten ignition coil connections (3).

Fig 28: Identifying Ignition Coil Connections

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Unfasten screws on cable ducts.

Remove cable ducts from brackets.

Fig 29: Locating Screws On Cable Ducts

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Unfasten screws in cover of electronics box.

Tightening torque: 4.4 Nm

Fig 30: Identifying Screws In Cover Of Electronics Box

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Remove relays (1 and 2) with bracket.

Relay for oxygen sensor heating
Relay for Digital Motor Electronics (DME)

(can be recognized because cross section of feed lines is greater than 2.5 mm² )

Fig 31: Identifying Relays With Bracket

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Disconnect plug connection on temperature sensor of electronics box.

Fig 32: Disconnecting Plug Connection On Temperature Sensor Of Electronics Box

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Disconnect plug connection (1 to 3).

Control unit for automatic transmission
Control unit for cruise control
Control unit for Digital Motor Electronics (DME)

Fig 33: Identifying Plug Connection

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Disconnect plug connections (1 to 4).

Fig 34: Disconnecting Plug Connections

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