SEAT Workshop Service and Repair Manuals

Engine control unit: replacing t  Removing → Anchor t  Fitting → Anchor Consult the equivalence table for tools and equipment according to applicability between Seat / VW / Audi / Skoda → Chapter. Special tools and workshop equipment required

t  Hot air gun -1- (of the cable repair kit -VAS 1978A-), see equivalent → Anchor t  Connection nozzle -2- (also of the cable repair kit -VAS 1978A-), see equivalent → Anchor t  Self-locking pliers, sold commercially (gripping jaws) -3- Removing –  First print out or memorise the control unit identification and also the previous control unit coding → Chapter. –  Switch off ignition.

–  Separate the mounting lugs -arrow A-.   WARNING It is essential to prevent damaging (burning) cables and connectors, insulation and control units, therefore, the procedure below must be followed exactly. Remember the instructions for using the hot-air gun. Carry out the adjustments on the hot air gun -4- as described below:

–  Turn the temperature control button -2- to the maximum heating power (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. Do not burn yourself! Also, make sure that, as far as possible, you only heat the breakaway bolt and not adjoining parts. If necessary, cover these parts.

–  Bring the nozzle of the hot-air gun up to the breakaway bolt on the lock. –  Connect the hot-air gun and heat the breakaway bolts for about 20 to 25 seconds.

–  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.

–  Disconnect and separate the control unit connectors and extract the engine control unit. Fitting –  Remove the remains of the threadlocker from the breakaway bolt holes. A male thread tap can be used for this. –  Place the new control unit into the retaining frame. –  Install control unit connector and lock. –  Fit the protective casing on the engine control unit. –  Use new breakaway bolts. –  Check the previous coding and adjust the new control unit → Vehicle diagnosis, testing and information system VAS 5051. –  Finally, interrogate the fault memory of the new engine control unit and erase the fault memory if necessary. → Chapter. –  Take vehicle for a test drive. –  Interrogate the new control unit fault memory again.