Engine Control Module: Service and Repair

12 14 550 Replacing Control Unit (DME) (N63, S63)







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







Necessary preliminary tasks:
- Turn off ignition
- Disconnect battery negative lead
- Remove microfilter housing

IMPORTANT: Follow instructions for removing and installing control units







Replacement:
- Carry out programming/coding
- If no data can be read out from the previous control unit, carry out injection quantity adjustment (description at end of instruction).







IMPORTANT: It is absolutely essential to read out the fault memory with the BMW diagnosis system and to create a fault memory printout.

Switch off ignition.







Lever out expander rivet.
Remove gasket (1).
Unfasten screws (2).
Feed out partition (3) and remove.







Lever out expander rivet.
Release locks in direction of arrow.
Feed out fresh-air duct (1) and remove.







Open retainers.
Release lock (1) in direction of arrow.
Remove cover (2).







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 is correctly seated (watertightness).







Unlock plug (1) on control unit and disconnect.
Remove control unit.

Installation:
Replacement:
Note device identification number and coding.







Injector adjustment:
If the DME control unit has been replaced, it will also be necessary to carry out adjustment of the injectors
Injector adjustment is carried out with the aid of so-called adjustment values.
The adjustment values are printed in two blocks of three digits on each injector.
The adjustment values must be stored in the new control unit







If injector adjustment is not carried out, the engine may run roughly or fail to start.
Read off the adjustment values and enter according to the installation location (cylinder) of the injectors:
- Connect BMW diagnosis system
- Identify car
- Select "Function selection"
- Select "Service functions"
- Select "Engine electronics"
- Select "Adjustment programs"
- Select "Adjust injectors"
- Change "Test schedule"
- The adjustment value must be entered for each cylinder.







NOTE:
Check stored fault message.
Delete fault memory.