12 14 555 Replace the control unit (DME) for cylinders 1-4 (N63 B40/B44 O 1) (X6 xDrive 50i)
Recycling
Catch and dispose of drained coolant.
Observe country-specific waste disposal regulations.
Necessary preliminary tasks:
- Switch off ignition.
- Disconnect BATTERY NEGATIVE LEAD .
- Remove POWER DISTRIBUTION BOX .
- FOLLOW instructions for repair work on the cooling system.
Replacement:
- Carry out programming/encoding
- If no data can be read out from the previous control unit, carry out injection quantity compensation (description at end of instructions).
Switch off ignition.
Unclip all cables from control unit holder.
Pull out control unit holder (1) slightly upwards until all connectors on control units are accessible.
Disconnect coolant hoses (1) with suitable disconnection tools.
Release and disconnect coolant hoses (1).
Unlock and pull off all connectors (2) from the control units.
Remove control unit holder (3) with the control units.
Release clamps (1) and pull off coolant hoses from control unit.
Release clamp (3).
Remove control unit (DME) cylinders 1-4 (2).
Injection quantity compensation:
If the DME control unit has been replaced, it will also be necessary to carry out adjustment of the injectors!
Injection quantity compensation 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 quantity compensation 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 vehicle
- Select "Function selection"
- Select "Service functions"
- Select "Engine electronics"
- Select "Adjustment function"
- Select "Adjust injectors"
- Select "Test plan"
- The adjustment value must be entered for each cylinder.
Clear diagnostic fault entries from fault memory.