12 51 240 Removing and installing/replacing engine sensor system module 2 wiring harness

WARNING: High-voltage system - danger to life
Compliance with the following points is mandatory before beginning work:

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

Necessary preliminary tasks:

Fig 1: Identifying Floor Trim Panel, Service Cap, Screws And Gasket

Courtesy of BMW OF NORTH AMERICA, INC.

Remove luggage compartment floor trim panel (1).

Release screws (2) and remove service cap (3) towards top.

Tightening torque 51 47 4AZ .

Installation note:

Check the neoprene nuts of the screw connections (2) and gasket (4) for damage and replace if necessary.

Fig 2: Identifying Control Unit (RDME) Plug Connection

Courtesy of BMW OF NORTH AMERICA, INC.

Control unit (RDME) is positioned in marked area (A).

Unlock plug connection (1) and disconnect from control unit (RDME).

Expose wiring harness.

Fig 3: Identifying Ignition Coils, Fuel Injector And Knock Sensor Connectors And Nut

Courtesy of BMW OF NORTH AMERICA, INC.

Slacken nut (1).

Release ground cable from cylinder head cover.

Unlock connectors (2) and pull off from ignition coils.

Unlock connectors (3) and pull off from fuel injectors.

Unlock connector (4) and pull off from knock sensor (the knock sensor is installed on the back of the cylinder head).

Release wiring harness if necessary from existing clips and clamps.

Feed out wiring harness and remove.

Installation note:

Check the wiring harness installation arrangement.

Check that the plug connections are correctly fitted.

Check fault code entry.

Clear diagnostic fault entries from fault memory.