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Exhaust system > < Engine control unit

Octavia Mk2

Removing and installing engine control unitJ623
Removing and installing engine control unit -J623-
(Octavia II, Yeti)
Special tools and workshop equipment required
t  Body saw, e.g. body saw -V.A.G 1523/A-
  Note
t  In order to unplug the plugs from the control unit, the control unit must always be removed.
t  If the engine control unit is replaced, connect the vehicle diagnosis, measurement and information system -VAS 505X- and carry out the function „replace engine control unit“.
Removing
–  Switch off ignition.
–  Remove the cooling water tank cover → Body Work; Rep. gr.66.
   
–  Remove bulkhead plenum chamber -arrows-.
  S24-0647
–  Open retaining clip -arrow- and remove engine control unit -J623 -.
Vehicles with protective cover
  A24-10451
–  Cut with body saw a slot for the cross-head screwdriver in the heads of the pull-off screws -3 and 4-.
  Note
t  In order to be able to unscrew the screws with a suitable screwdriver, the slot must be wide enough. This is achieved by sawing twice with the body saw.
t  A locking agent is applied to the pull-off screws.
–  Unscrew the screws and remove the protective cover for the plug connections -2 and 5-.
Continued for all vehicles
–  Unlock both plugs at engine control unit and unplug.
Install
–  Connect both plugs and lock.
Vehicles with protective cover
–  Fasten protective cover with new pull-off screws.
–  Tighten pull-off screws evenly until the screw heads are pulled off.
Continued for all vehicles
  A24-0593
–  Push engine control unit into the bracket and lock with retaining clip -arrow-.
–  Install the cooling water tank cover → Body Work; Rep. gr.66.
  A24-10451

Exhaust system > < Engine control unit