12 14 550 Replacing control unit (DME) (230i and 230i xDrive coupe/convertible)

Attention! 

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

Necessary preliminary work: 

• Disconnect BATTERY NEGATIVE CABLE .
• Remove ACOUSTIC COVER .

Attention! 

FOLLOW  instructions for removing and installing control units.

The fault memory must be read out using the diagnosis system, and a fault memory printout made.

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 instruction).

Removal: 

Remove cover (1).

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Unlock and disconnect plugs (1).

Unlock and disconnect plugs (2).

Loosen the wiring harness from the holder (3) and put to one side.

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Unlock and loosen all connectors (1).

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Unlock and loosen all connectors (1) in the direction of the arrow.

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Unlock and loosen the locks along the arrow.

Remove the Digital Motor Electronics control unit (1).

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Installation: 

Insert and install the Digital Motor Electronics control unit (1).

The locks must engage audibly along the arrow.

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Connect and lock all connectors (1) along the arrows.

All connectors (1) must engage audibly.

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Connect and lock all connectors (1).

All connectors (1) must engage audibly.

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Connect connector (2) and lock.

Attach and lock connector (1).

All connectors must audibly engage.

Insert and secure the wiring harness to the holder (3).

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Install cover (1).

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Required follow-up work: 

• Connect BATTERY EARTH LEAD .
• Install ACOUSTIC COVER .

Attention! 

If the DME control unit has been replaced, it will also be necessary to reset the minimum quantity adjustment of the injectors! 

Reset ultra-small quantity adaptation: 

• Connect diagnosis system and follow 

diagnosis instructions 

• Read out vehicle data
• Identification without vehicle test
• Start vehicle test
• Vehicle handling
• Service functions
• Power train
• Engine electronics
• Adjustment functions
• Delete adaptations
• Reset adaptation values
• Resetting minimum quantity adaptations