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

A4 Mk1

MPFI 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 always leave the ignition on.
 
→ Indicated on display:
Rapid data transfer      HELP
Select function XX
  • ‒ Enter "02" for the function "Interrogate fault memory" and confirm entry with Q key.
 
→ Indicated on display:
No fault detected!
  • ‒ Press ⇒key.

or
 
→ Indicated on display:
X faults detected!

If the printer is switched on, the stored faults will be displayed and printed out in sequence.

  • ‒ Locate and eliminate printed faults as per fault table => Page 01-11.
  • ‒ Press ⇒key.
 
→ Indicated on display:
Rapid data transfer    HELP
Select function XX
  • ‒ Enter "05" for function "Erase fault memory" and confirm entry with Q key.

Notes:
 
→ Indicated on display:
Warning
Fault memory not interrogated

Sequence has not been correctly followed.

  • ‒ Interrogate fault memory:

The fault memory will also not be erased if :

  • ◆ Ignition has been switched off after interrogating fault memory.
  • ◆ Static fault has not been rectified.
  • ◆ Engine speed greater than 2500 rpm.
 
→ Indicated on display:
Rapid data transfer    ⇒
Fault memory is erased.
  • ‒ Press ⇒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 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 or fault reader V.A.G 1551 and selecting functions