12 12 14 550 Replacing control unit (DME) (S55)

Necessary preliminary tasks:

IMPORTANT: FOLLOW instructions for removing and installing control units

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).

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.

Removal:

Release screws (1).

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Release screws (1).

Remove control unit from INTAKE PLENUM .

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Preparation for installation:

Clean contact surfaces of knock sensors on engine block.

Replace gasket between intake plenum and control unit.

Part: Gasket.

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Installation:

Mount control unit on intake plenum.

Tighten down screws (1).

Tightening torque: 12 14 1AZ .

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Tighten down screws (1).

Tightening torque: 12 14 2AZ .

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Required follow-up work:

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 value is printed with three digits - depending on the version - on the injector body.

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:

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