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Repairing Diesel Direct Injection system > < Engine control unit

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Removing and installing engine control unit-J248-
Removing and installing engine control unit-J248-
  Note
t  Before replacing the engine control unit -J248- first the control unit identification and hence the coding of the current control unit must be interrogated with → Vehicle diagnosis, testing and information system VAS 5051.
t  When replacing, the new engine control unit -J248- must be coded → Vehicle diagnosis, testing and information system VAS 5051.
Removing
  Note
t  If the engine control unit must be replaced, connect → Vehicle diagnosis, testing and information system VAS 5051 and perform the function “replace engine control unit”.
t  The learning values are erased when the plug is removed from the engine control unit, the fault memory contents are however retained.
–  Remove the cooling water tank cover → Body Work; Rep. Gr.66.
–  Switch off ignition.
   
–  Unscrew screws of box cover from engine control unit -arrows- and remove cover.
–  Loosen mounting bracket from engine control unit.
–  Unlock plug from engine control unit and remove.
–  Take out control unit.
Install
Installation is performed in the reverse order, pay attention to the following points:
–  Connect both plugs and lock.
  Note
After installation of the new control unit, activate the engine control unit in the “Targeted fault finding” in the diagnostic field “replace engine control unit” → Vehicle diagnosis, testing and information system VAS 5051.
  S23-0189

Repairing Diesel Direct Injection system > < Engine control unit