12 51 100 Replacing Wiring Harness Section For Ignition and Injectors

12 51 100 Replacing Wiring Harness Section For Ignition And Injectors (N63)







IMPORTANT: Read and comply with notes on protection against damage from electrostatic damage (ESD protection).







Necessary preliminary work:
- Read out the fault memory of the DME control unit.
- Switch off ignition.
- Disconnect battery earth lead.
- Remove left and right intake silencer housings.
- Remove intake pipes on left and right
- Partially release wiring harness for engine.







Release screws (1).
Tightening torque 12 90 2AZ.
Remove electronics box cover (2).







Unlock all connectors (1) from control unit and disconnect.
Unclip grommet hold-down device (2) and remove.
Detach rubber grommets (3) from electronics box.
Place wiring harnesses to the side.

Installation note:
Make sure grommets are correctly fitted (watertightness).







Release clamps (1) and (2).
Replace clamps (2).
Detach both charge-air ducts (3) and remove.
Check the gaskets on the exhaust turbocharger. replacing if necessary.







Picture shows the left side, the procedure for the right side is identical.
Detach hoses (1) from clean-air pipe.
Release screw (2).
Tightening torque 13 71 1AZ.
Detach clean-air pipe (3) in direction of travel from exhaust turbocharger.
Check the gasket on the clean air pipe. replacing if necessary.







Release screws (1).
Tightening torque 12 51 2AZ.
Unlock plugs on injectors and ignition coils and detach.
Release wiring harness (2).
Release wiring harness (3) and lay to one side.







Release screw (1).
Tightening torque 12 51 2AZ.
Raise cable duct (2).







Pull off cable duct (1) from cable clip (2) in upward direction.
Cable (3) does not have to be released.







Release screws (1).
Tightening torque 12 51 2AZ.
Raise cable duct (2).







Release screws (1).
Tightening torque 12 51 2AZ.
Release screw (2).
Unlock plugs on injectors and ignition coils and detach.
Lay wiring harness (3) to one side.
Feed out air wiring harness (4) and remove.







NOTE:
Check wiring harness installation arrangement.
Check plug connections for correct fit.
Check stored fault message.
Delete fault memory.