12 51 210 Replacing wiring harness section for ignition and injectors (N20)

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

Necessary preliminary tasks:

Read out the fault memory of the DME control unit.
Switch off ignition.
Remove ACOUSTIC COVER
Release PRESSURE CONVERTER for exhaust turbocharger and place to one side.

Fig 1: Overview Of Wiring Harness Section For Ignition And Injectors
Courtesy of BMW OF NORTH AMERICA, INC.

Overview of wiring harness section for ignition and injectors.

Unlock and remove connector (1) from control unit.

Fig 2: Identifying Connector From Control Unit

G09914370

Courtesy of BMW OF NORTH AMERICA, INC.

Release wiring harness from clamps (1).

Fig 3: Identifying Wiring Harness Clamps

G09914371

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: This procedure is applicable to all cylinders.

Unlock and disconnect connector (1) at injectors.

Slacken nut (1) and remove ground cable (3).

Tightening torque 12 52 2AZ .

Fig 4: Identifying Connector, Slacken Nut And Ground Cable

G09846796

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: This procedure is applicable to all cylinders.

Release connector catch (1) at ignition coil (2) and pull off connector.

Fig 5: Pulling Out Ignition Coil

G09914031

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock retaining lug (1) in direction of arrow.

Pull cable channel (2) from cylinder head cover.

Pull out and remove wiring harness section for injectors and ignition coils.

Fig 6: Pulling Cable Channel

G09914374

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Check stored fault messages.
Delete fault memory.