12 51 300 Removing and installing/replacing engine wiring harness section, ignition module cylinder 1-4 (N63 B40/44 O 1)

IMPORTANT: Read and comply with notes on PROTECTION AGAINST ELECTROSTATIC DAMAGE (ESD PROTECTION) .

IMPORTANT: Screw back on all screw points of cable channels without fail! Some screw points are also ground points. If the wiring harnesses are not correctly screwed tight and secured, this may cause DME malfunction and failure!

Necessary preliminary tasks:

Read out the fault memory of the DME control unit.
Switch off ignition.
Remove right suspension cross-brace. See 51 71 346 REMOVING AND INSTALLING/REPLACING RIGHT (REAR) SUSPENSION CROSS-BRACE .
Remove right-hand INTAKE SILENCER HOUSING .
Remove right intake duct. See 13...... REMOVE THE INTAKE PORT (N63 B40/B44 O 1) .

Fig 1: Overview Of Engine Wiring Harness Section Ignition Module Cylinder 1-4
Courtesy of BMW OF NORTH AMERICA, INC.

Overview of engine wiring harness section, ignition module cylinder 1-4.

Unlock all connectors from ignition coils and injectors and detach.

Release screws (1).

Tightening torque 12 51 2AZ .

IMPORTANT: Screw back on all screw points of cable channels without fail. Some screw points are also ground points .

Fig 2: Identifying Screws Of Engine Wiring Harness Section

Courtesy of BMW OF NORTH AMERICA, INC.

If fitted:

Unscrew nuts (1).

Detach ground connections.

Fig 3: Identifying Ground Connections Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

Release wiring harness if necessary from existing clips and clamps.

Feed out wiring harness and remove.

Installation note:

Check wiring harness installation arrangement.

Check plug connections for correct fit.

Check stored fault message.

Clear diagnostic fault entries from fault memory.