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Volkswagen Workshop Service and Repair Manuals

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Coding engine control unit > < Replacing, coding and matching engine control unit

Passat (B3)

Diesel direct injection and glow plug system
Replacing, coding and matching engine control unit
Replacing engine control unit

Special tools, testers, measuring instruments and auxiliary items required

  • ◆ Fault reader V.A.G 1551 with cable V.A.G 1551/3

Work sequence

  • ‒ First print out the control unit identification and thereby the previous control unit coding as follows:
  • ‒ Connect fault reader V.A.G 1551 (V.A.G 1552) and select the engine electronics control unit with the "address word" 01
    ; Connecting fault reader and selecting engine electronics control unit.
 
→ Print out control unit identification by pressing print key of fault reader (example).
028906021CG 1.9l R4 EDC G00SG 0829⇒
Coding 00002     WSC XXXXX
  • ‒ Press ⇒ key.
  • ‒ Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
    		•
     
    → Indicated on display:
    Rapid data transfer     HELP
    Select function XX
    • ‒ Switch off ignition.
    • ‒ Release and pull off control unit connector.
    • ‒ Remove old control unit.
    • ‒ Before installing the exchange control unit, note its Part No.
    • ‒ Check the previous coding and Part No. of the old control unit and code the exchange control unit according to table => Page 23-92 .
    • ‒ If the vehicle is equipped with a cruise control system (CCS) (recognised by a G before gearbox version, e.g. G00SG) then this must be activated on exchange engine control unit.

    => Current flow diagrams, Electrical fault finding and Fitting locations binder

    • ‒ Match engine control unit to the electronic immobilizer => Page 23-98

    Coding engine control unit > < Replacing, coding and matching engine control unit