12 51 100 Replacing wiring harness section for ignition and injectors

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2010 BMW 535xi, 2010 BMW 535i, 2009 BMW 535xi, 2009 BMW 535i, and 2008 BMW 535xi. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT:

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:

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) .

Necessary preliminary tasks:

Read out fault memory of DME control unit
Switch off ignition
Disconnect BATTERY NEGATIVE LEAD
Remove acoustic cover
Remove INTAKE FILTER

Unlock cover (1) with slide (3). Release screws (2).

Remove cover (1).

Fig 1: Identifying Electronics Box Cover, Slide And Screws

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Unlock all plugs (1) of DME control unit and disconnect.

If necessary, unlock control unit and raise approx. 5 cm.

Fig 2: Identifying DME Control Unit Plugs

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Press locking tab (1) in direction of arrow and pull contact carrier (2) out of housing.

Fig 3: Pressing Locking Tab And Pulling Contact Carrier Out Of Housing

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Press locking tabs (1) in direction of arrow and pull contact carrier (2) out of housing.

Fig 4: Pressing Locking Tab And Pulling Contact Carrier Out Of Housing

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Press locking tab (1) in direction of arrow and pull contact carrier (2) out of housing.

Fig 5: Pressing Locking Tab And Pulling Contact Carrier Out Of Housing

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Release screws and remove cable duct (1).

Installation:

Replace aluminium screws.

Tightening torque 12 52 2AZ .

Fig 6: Identifying Cable Duct With Screws

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WORK STEP REFERENCE CHART

Work step

⁽¹⁾

Disconnect positive lead at jump-start connection point

Unlock plug connections on ignition coils and disconnect

Unclip capacitor

Unlock plug on injectors and disconnect

Release ground connections

Unlock plug on pressure transducers and disconnect

Unlock plug on both solenoid valves and disconnect

VANOS valves

Unlock plug on inlet and exhaust camshaft sensors and disconnect

Unlock plug for rail pressure sensor and disconnect

Unlock plug on oil pressure switch and disconnect

Unlock plug on coolant temperature sensor and disconnect

Remove FRONT UNDERBODY PROTECTION

Unlock plug on electric coolant pump and disconnect

Unlock plug on coolant thermostat and disconnect

Release ground connection on engine next to coolant pump

Tightening torque 12 52 3AZ .
Replace screw.

NOTE:

⁽¹⁾	Check stored fault messages. Now clear the fault memory.