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Reading out and erasing the engine control unit event memory > < Engine control unit with anti-theft protection, Version 2: Removing and installing

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Engine control unit with anti-theft protection, Version 3: Removing and installing
Engine control unit with anti-theft protection, Version 3: Removing and installing
Removing → Anchor
Installing → Anchor
Consult the equivalence table for tools and equipment according to applicability among Seat / VW / Audi / Skoda → Chapter.
Special tools and workshop equipment required
   
t  Wiring harness repair set -VAS 1978A-, see equivalent → Anchor
t  Connectable nozzle -2- (also from the cable repair kit -VAS 1978A-)
t  Self-locking pliers, sold commercially (gripping jaws) -3-
t  Vehicle diagnosis, testing and information system -VAS 5051B-
  Note
To replace the engine control unit, connect the central diagnosis -VAS 5051B- or central diagnosis -VAS 5052- and complete the guided function „Replace control unit“.
Removing
–  Switch off ignition and take out ignition key.
–  Remove the front panel of the plenum chamber → Bodywork, exterior fitting work; Rep. gr.50.
  Note
  A24-0475
t  The engine control unit -1- is bolted to a protective casing -2 and 5-. To make it even more difficult to undo the breakaway bolts -3 and 4- on the locking device-2-, a threadlocker has been used.
t  To disconnect connectors on the engine control unit (e.g. when connecting the testing box or to replace the engine control unit), the protective casing must be removed.
Removal:
–  When renewing engine control unit, select diagnosis object „engine control unit“ in „Guided Functions: replace“, Vehicle diagnostic, testing and information system -VAS 5051B-.
–  Switch off ignition and take out ignition key.
–  Remove the front panel of the plenum chamber → Bodywork, exterior fitting work; Rep. gr.50.
  A24-0593
–  Open the clip»arrow« and remove the engine control unit.
  WARNING
To ensure that damage (burning) is not caused to the cables and connectors as well as insulation and control units, the following steps must be observed in all cases: Remember the instructions for using the hot-air gun.
Carry out the adjustments on the hot air blower -4- as described below:
  A24-10451
–  Turn temperature setting potentiometer -2- to maximum heat output (600°C).
  Note
t  Next, heat the breakaway bolts with the hot-air gun. This reduces the strength of the threadlocker on the thread of the breakaway bolts to make them easier to remove.
t  Cover all painted parts to prevent damage from the hot-air gun or the self-locking pliers.
  WARNING
When breakaway bolts are heated, some parts of the protective casing become very hot. Risk of burn injuries! Also, make sure that, as far as possible, you only heat the breakaway bolt and not adjoining parts. If necessary, cover these parts.
  A24-0476
–  Bring the nozzle of the hot-air gun up to the breakaway bolt on the lock.
–  Connect hot air gun and heat the head bolt approx. 20 to 25 seconds.
  A24-0594
–  Release the breakaway bolts with the self-locking pliers -arrow-.
Follow the same procedure with the second breakaway bolt.
Separate the protective casing from the engine control unit.
–  Unlock the front and rear connectors from the engine control unit.
  A24-0595
Installing
Installation is carried out in the reverse order; noting the following in the process:
–  Remove the remains of the threadlocker from the breakaway bolt holes. A male thread tap can be used for this.
–  First connect the rear connector and next, the front connector to the engine control unit and lock.
–  It is essential that the protective casing -2 and 5- is replaced onto the engine control unit -J220-.
–  Use new breakaway bolts.
–  Interrogate and erase fault memory if necessary → Chapter.
  A24-0593

Reading out and erasing the engine control unit event memory > < Engine control unit with anti-theft protection, Version 2: Removing and installing