12 14 555 Replace the control unit (DME) for cylinders 1-4 (N63O1): Notes

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

Recycling

Catch and dispose of drained coolant.

Observe country-specific waste disposal regulations.

Necessary preliminary tasks:

Switch off ignition.
Disconnect BATTERY NEGATIVE LEAD .
Remove ACOUSTIC COVER
Remove right INTAKE DUCT .
Follow instructions for REPAIR WORK ON THE COOLING SYSTEM .

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.

Unlock all plugs (1) from control unit and detach.

Unclip wiring harnesses from cable clips.

Fig 1: Identifying Control Unit Plugs

Courtesy of BMW OF NORTH AMERICA, INC.

Release clamps (1), detach coolant hoses. from the control unit and close.

Release the coolant hose from clamp (2).

Unscrew nuts (3).

Remove control unit.

Fig 2: Identifying Coolant Hose Clamps And Nuts

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Catch and dispose of escaping coolant.

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.

Fig 3: Identifying Injector Adjustment Value
Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Check stored fault message.
Delete fault memory.