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A5

Removing and installing engine control unitJ623
Removing and installing engine control unit -J623-
Removing
–  Before removing the engine control unit -J623-, the adaption values of the injectors and the ash deposit mass must be read out. Use → Vehicle diagnostic tester.
The adaption values for the injectors in the old (defective) engine control unit can be read out via the Guided Fault Finding or Guided Functions mode and can be stored as an electronic file in the → Vehicle diagnostic tester.
–  Switch off ignition and remove ignition key after storing electronic file containing adaption values.
  Note
If the adaption values of the injectors cannot be read out of the old (defective) engine control unit, they must be entered into the new engine control unit manually and the adaption procedure must be performed accordingly.
–  Remove plenum chamber cover → Rep. gr.50.
   
–  Unscrew bolts -arrows- and pull filler neck out of washer fluid reservoir and through opening in body to right side.
  A92-10232
–  Release catch -arrow- and detach engine control unit -J623--item 1-.
  Note
Disregard -item 2-.
Installing
Installation is carried out in the reverse order; note the following:
–  After the engine control unit -J623- has been renewed, the „Injector delivery calibration“ and the „Injector voltage calibration“ must also be re-adapted in the engine control unit (these functions influence engine power and exhaust emissions).
–  On vehicles with particulate filter the current mileage (km) reading must be stored in the engine control unit -J623- via an adaption procedure.
The procedure required after connecting the new engine control unit is described in the Guided Fault Finding or Guided Functions. Use → Vehicle diagnostic tester.
  A23-10596

Intake manifold > < High-pressure pump