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SEAT Workshop Service and Repair Manuals

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Overview of fitting locations > < Lambda probe and pressure differential sender

Leon Mk1

Wiring and component check with test boxV.A.G 1598/42
Wiring and component check with test box -V.A.G 1598/42-
Consult the equivalence table for tools and equipment according to applicability among Seat / VW / Audi / Skoda → Chapter.
Special tools and workshop equipment required
t  Adapter cable -V.A.G 1598/39-1-
t  Adapter cable -V.A.G 1598/39-2-
   
t  Test box -V.A.G 1598/42-
  Note
t  The test box has 105 contacts. The connecting cable can be disconnected from the test box. This means that only the cable (and not the test box) has to be purchased for future engine control units with different types of connectors.
  A24-0622
t  The smaller of the two connectors in the engine control unit has terminals 1 to 60. The larger of the two connectors has terminals 1 to 94.
t  To carry out tests on the 60-pin wiring harness connector, the adapter lead -V.A.G 1598/39-1- is connected to connector „A“ on the test box. For components connected to 60-pin wiring harness connector → Current flow diagrams, Electrical fault finding and Fitting locations.
t  To carry out tests on the 94-pin wiring harness connector, the adapter lead -V.A.G 1598/39-2- must be connected to connectors -A- and -B- on the test box. For components connected to 94-pin wiring harness connector → Current flow diagrams, Electrical fault finding and Fitting locations.
t  The test box -V.A.G 1598/42- is designed so it can be connected both to the wiring harness for the engine control unit and to the engine control unit itself at the same time.
t  This has the advantage that, when the test box is connected, the electronic engine control remains totally operative (for example, measurement of signals with the engine running).
t  If the engine control unit should also be connected to the test box, this is indicated in the corresponding test cycles.
  WARNING
To prevent irreparable damage to the electronic components, select appropriate measuring range before connecting the measuring cables and observe the test requirements.
–  Remove engine control unit → Chapter.
–  Connect the test box -V.A.G 1598/42- using the adapter cable -V.A.G 1598/39-1- or the adapter cable -V.A.G 1598/39-2- to the wiring harness. Connect earth clip of test box to negative terminal of battery. The instructions for performing the individual tests indicate whether or not the engine control unit itself also needs to be connected to the test box.
–  Carry out the test, as described in the relevant repair procedures.
Installing engine control unit
The assembly takes place in the reverse series; the protective housing is again attached on the engine control panel. New shear bolts must be used.
Carry out the following jobs after re-connection of the engine control panel:
–  Interrogate and, if necessary, erase fault memory.
  A24-0622

Overview of fitting locations > < Lambda probe and pressure differential sender