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Exhaust system > < Removing and installing engine control unitJ623 (Golf ? 2008, Eos)

Golf Mk5

Removing and installing anti-theft engine control unitJ623 (Golf ► 2008, Eos ► 10.2008)
Removing and installing anti-theft engine control unit -J623- (Golf ► 2008, Eos ► 10.2008)
Special tools and workshop equipment required
   
t  Hot air blower from wiring harness repair set -VAS 1978-
t  Nozzle attachment from wiring harness repair set -VAS 1978-
If you wish to renew the engine control unit, connect the → vehicle diagnosis tester and perform the guided function „Renewing control unit“.
Removing
–  Switch off ignition.
–  Remove wiper arms and plenum chamber cover: → Electrical system; Rep. gr.92.
–  Remove plenum chamber bulkhead → General body repairs; Rep. gr.50.
  Note
The shear-head bolt threads are coated with locking compound. Heating the shear-head bolt with a hot air blower releases the locking effect of the locking compound.
  Caution
Cover lines, connections and control units in the vicinity of the engine control unit to prevent damage through heat (scorching/melting of plastics etc.).
Perform settings on hot air blower -4- as shown:
  W00-0447
–  Turn temperature setting potentiometer -2- to maximum heat output (600°C).
–  Set two-stage switch for volume of air -3- to position 3.
  WARNING
When shear-head bolts are heated up, parts of the protective housing will be subjected to a large amount of heat. Wear protective gloves to avoid possible injury.
–  Place nozzle of hot air blower close to shear-head bolt.
–  Switch on hot air blower and heat bolt for about 20 to 25 seconds.
–  Unscrew shear-head bolt using mole grips on bolt head.
The procedure for the second shear-head bolt is identical.
  A24-0476
–  Insert a screwdriver between protective housing -A- and bracket -arrow-.
  N24-10098
–  Lever up protective housing using screwdriver -A- and in sideward motion pull off bracket -arrow-.
  N24-10097
–  Bend catch open slightly -1-.
–  Then push engine control unit out of retainer -arrow-.
–  Now release connector on engine control unit and pull off connector.
Installing
–  Fit connector to engine control unit and lock connector in position.
–  Push engine control unit onto bracket.
  N24-10095
–  Press catch -1- against engine control unit.
–  Select „guided functions“ in the vehicle diagnosis, testing and information system -VAS 5051B-.
–  Perform vehicle identification and select engine code.
–  Perform function „Renew control unit“.
–  Push protective housing onto bracket.
  N24-10095
–  Tighten new shear-head bolts -1- evenly until heads shear-head off.
–  If engine control unit -J623- is renewed, erase learnt values and adapt engine control unit using → vehicle diagnosis tester in „Guided functions“.
–  Read fault memory, repair faults if necessary and then erase fault memory → Vehicle diagnosis tester„Guided fault finding“.
–  Install plenum chamber bulkhead → General body repairs; Rep. gr.50.
–  The readiness code must be generated if the fault memory has been erased.
–  Carry out a road test.
–  Read control unit fault memory again.
  N24-10055

Exhaust system > < Removing and installing engine control unitJ623 (Golf ? 2008, Eos)