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Fault table > < Connecting vehicle diagnosis, measurement and information system VAS 5051 orfault reader V.A.G 1551 and selecting functions

A4 Mk1

MPI fuel injection and ignition system
Interrogating and erasing fault memory
Interrogating and erasing fault memory
  • ‒ Connect up vehicle diagnosis, measurement and information system VAS 5051 or fault reader V.A.G 1551 and select engine electronics control unit with "Address word" 01 .
    When doing this, the engine should be idling.

Note:

If the engine will not start, crank it for at least 5 seconds with the starter and then leave the ignition on.
 
→ Indicated on display:
Rapid data transfer     HELP
Select function XX
  • ‒ Enter "02" "Interrogating fault memory" function and confirm entry with Q key.
 
→ Indicated on display:
No fault detected!
  • ‒ Press the ⇒key.

or
 
→ Indicated on display:
X faults recognised

The stored faults are displayed and printed in sequence when the printer is switched on.

  • ‒ Locate and eliminate faults listed on printout as per fault table => Page 01-13.
  • ‒ Press the ⇒key.
 
→ Indicated on display:
Rapid data transfer    HELP
Select function XX
  • ‒ Enter "05" for "Erasing fault memory" function and confirm entry with Q key.

Notes:
 
→ Indicated on display:
Attention!
Fault memory was not interrogated

Sequence of operations was not carried out properly.

  • ‒ Interrogate fault memory:

The fault memory will also not be erased if :

  • ◆ The ignition has been switched off after interrogating the fault memory.
  • ◆ A static fault has not been rectified.
 
→ Indicated on display:
Rapid data transfer    ⇒
Fault memory is erased
  • ‒ Press the ⇒key.
  • ‒ Interrogate fault memory again after carrying out the repairs.

Note:

This erases faults that have been stored whilst the fault was being rectified, for example, faults that have arisen as a result of connectors being detached.

  • ‒ Carry out a test drive (lasting at least 10 minutes).
  • ‒ Enter "00" for address word "Automatic test sequence" and confirm entry with Q key.

Note:

If, when rectifying faults on vehicles with automatic gearbox, the connector is pulled off the engine control unit, the fault memory of the gearbox control unit must also be interrogated and erased. This is because the "Engine/gearbox electrical connection: Open circuit" fault will have been stored in the gearbox control unit.

End of output
 
→ Indicated on display:
Rapid data transfer    HELP
Select function XX
  • ‒ Enter "06" for "End of output" function and confirm entry with Q key.
 
→ Indicated on display:
Rapid data transfer    HELP
Enter address word XX
  • ‒ Switch off ignition and detach diagnostic connector.

Fault table > < Connecting vehicle diagnosis, measurement and information system VAS 5051 orfault reader V.A.G 1551 and selecting functions