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Exhaust system > < Engine control unit

Octavia Mk2

Removing and installing engine control unit
Removing and installing engine control unit
Special tools and workshop equipment required
t  Body saw, e.g.-V.A.G 1523 A-
  Note
t  If the engine control unit is replaced, connect the vehicle diagnosis, measurement and information system -VAS 5051B- and carry out the function “replace engine control unit”.
t  If the engine control unit is replaced on vehicles with engine identification characters BLR, BLX, BLY, BVX, BVY, BVZ, the throttle valve control unit -J338- must be cleaned → Chapter before the adaptation.
Removing
–  Switch off ignition.
–  Remove the cooling water tank cover → Body Work; Rep. Gr.66.
   
–  Remove intermediate wall for the plenum chamber.
–  Removing windscreen wiper and washer system → Electrical System; Rep. Gr.92.
Vehicles with protective cover
  S24-0647
–  Cut with body saw -1- a slot for the cross-head screwdriver in the heads of the pull-off screws -2-.
  Note
t  It must be sawed 2x with the body saw, so that the slot is wide enough, in order to be able to unscrew the screws with a suitable screwdriver.
t  The pull-off screws until are inserted with locking agent.
–  Screw out the screws.
  S24-0541
–  Lift locking tab of protective cover with a cross-head screwdriver.
–  Push the protective cover in the -direction of the arrow- out of the bracket for engine control unit.
Continued for all vehicles
  S24-0542
–  Unlock the front plug -1- at the engine control unit and disconnect.
–  Lever off lock -2- slightly.
–  Push engine control unit out of the bracket -arrow-.
–  Unlock the rear plug at the engine control unit and disconnect.
Install
  Note
For vehicles with protective cover, the metal swarfs must be suctioned out of the plenum chamber before installing the engine control unit.
–  Connect the rear plug to the engine control unit and lock.
–  Slide the engine control unit onto the retaining bracket.
  S24-0560
–  Press locking mechanism -2- in direction of engine control unit.
–  Connect the front plug -1- at the engine control unit 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
–  Installing windscreen wiper and washer system → Electrical System; Rep. Gr.92.
–  Install the intermediate wall and cooling water tank cover → Body Work; Rep. Gr.66.
  S24-0560

Exhaust system > < Engine control unit