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Exhaust system > < Removing and installing engine control unitJ623

Polo Mk5

Removing and installing anti-theft engine control unitJ623
Removing and installing anti-theft engine control unit -J623-
If you wish to renew the engine control unit, connect the → Vehicle diagnostic tester and carry out the guided function „Renew control unit“.
–  Switch off ignition.
Removing
–  Remove air filter → Chapter.
   
–  Open wiring guide -1- and lift locking device -2-.
–  Take engine control unit out of retainer.
  N24-10336
–  Unscrew shear-head bolt -1- using pliers.
–  Turn engine control unit -2- over and unscrew second shear-head bolt using pliers.
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–  Pull retainer -1- and protective housing -2- off engine control unit -3- in -direction of arrow-.
–  Release connectors on engine control unit and pull off connector.
Installing
–  Fit connectors and lock in position.
–  Push the protective housing over the engine control unit.
–  Install retainer for protective housing using new shear-head bolts.
–  Tighten shear-head bolts evenly until head shears off.
  N24-10338
–  Insert engine control unit into control unit retainer on plenum chamber bulkhead until it engages in catches -1-.
–  Insert wiring into wiring guide -1- and close guide.
–  Install air filter → Chapter.
–  If engine control unit -J623- is renewed, erase learnt values and adapt engine control unit → Vehicle diagnostic tester„Guided functions“.
–  Read fault memory, repair faults if necessary and then clear fault memory → Vehicle diagnostic tester„Guided fault finding“.
–  The readiness code must be generated if the fault memory has been erased.
–  Carry out a road test.
–  Read control unit fault memory again.
  N24-10336

Exhaust system > < Removing and installing engine control unitJ623