12 51 100 Replacing Wiring Harness Section For Ignition Coil (N52)

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IMPORTANT:

Aluminum-magnesium materials.

No steel screws/bolts may be used due to the threat of electrochemical corrosion.

A magnesium crankcase requires aluminum screws/bolts exclusively.

Aluminum screws/bolts must be replaced each time they are released.

The end faces of aluminum screws/bolts are painted blue for the purposes of 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 DME fault memory
Switch off ignition
Disconnect battery negative lead. See 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD.
Remove ignition coil cover. See 11 00 REMOVING AND INSTALLING/REPLACING IGNITION COIL COVER (N52)
Remove control unit plug. See 12 14 550 Replacing Control Unit (DME)

Release screws and remove retaining bar (1).

Unlock upper section (2) of partition seal in direction of arrow and remove.

Release grommets (3) for wiring harnesses from lower section of partition seal and from electronics box.

Installation:

Make sure grommets are correctly seated (watertightness).

Fig 1: Locating Ignition Coil Covers Screws And Holder

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock tab (1), pull contact carrier (2) in direction of arrow out of housing.

Unlock and disconnect all plug connections of ignition coil wiring harness section in electronics box.

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

Fig 2: Locating Grounding Cable And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

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

REFERENCE CHART

Work step	Note
Disconnect positive lead at jump-start connection point
Disconnect ground cables
Unlock plug connections on ignition coils and disconnect
Unlock cable duct on cylinder head cover and detach
Unlock plug on eccentric shaft sensor and disconnect
Unlock plug on positioning motor for eccentric shaft and disconnect
Unlock plug on both solenoid valves and disconnect
Unlock plug on inlet and exhaust camshaft sensors and disconnect
Unlock plug on A/C compressor and disconnect
Unlock plug on oil pressure switch and disconnect
Unlock plug on coolant temperature sensor and disconnect
Disconnect connector strip from fuel rail
Remove front underbody protection. See 51 47 491 REMOVING AND INSTALLING/REPLACING REAR UNDERBODY PROTECTION
Unlock plug on electric coolant pump and disconnect
Unlock plug on coolant thermostat and disconnect
Disconnect engine ground connection	Tightening torque, see 12 52 3AZ in 52 PLUG CONNECTIONS, TERMINALS, LOOSE PARTS . Replace screw.

NOTE:

Check stored fault messages.

Now clear the fault memory.