12 51 100 Replacing wiring harness section for ignition and injectors (N54)

WARNING: This page is about a different car, the 2010 BMW X6, 2009 BMW X6, and 2008 BMW X6. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Aluminum screws/bolts must be replaced each time they are released.
Aluminum 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). , see 61 35... NOTES ON ESD PROTECTION (ELECTRO STATIC DISCHARGE) .

Necessary preliminary tasks:

Read out fault memory of DME control unit
Switch off ignition
Disconnect battery negative lead , see 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD .
Remove intake filter , see 11 61 050 REMOVING AND INSTALLING INTAKE AIR MANIFOLD (N54) .
Remove acoustic cover , see 11 00 REMOVING AND INSTALLING/REPLACING IGNITION COIL COVER (N54) .

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

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

Fig 1: Identifying Plugs Of DME Control Unit

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 2: Identifying Locking Tab And Contact Carrier

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 3: Identifying Locking Tabs And Contact Carrier

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 4: Identifying Locking Tab And Contact Carrier

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws and remove cable duct (1).

Installation:

Replace aluminum screws.

Tightening torque 12 52 1AZ , see 12 52 PLUG CONNECTIONS, TERMINALS, LOOSE PARTS .

Fig 5: Identifying Screws And Cable Duct

Courtesy of BMW OF NORTH AMERICA, INC.

WORK STEP REFERENCE CHART

Work step	Note:
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 crankcase breather hose
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 , see 12 52 PLUG CONNECTIONS, TERMINALS, LOOSE PARTS . Replace screw.

NOTE: Check stored fault messages.
Now clear the fault memory.