Audi Workshop Service and Repair Manuals

• ‒ Connect fault reader V.A.G 1551 (V.A.G 1552) and select the engine electronics control unit using "Address word" 01. When doing this the engine must be running at idling speed.
  (Connecting fault reader and selecting engine electronics control unit .)

Only if engine does not start:

• ‒ Interrogate fault memory with ignition switched on.

• ‒ Press keys 0 and 2 for "Interrogate fault memory" function and press Q key to confirm entry.

If no fault is stored:

• ‒ Press ⇒key.

If one or more faults are stored:

The stored faults are displayed and printed out one after the other.

• ‒ Locate and eliminate faults listed on printout as per fault table => Page 01-11.
• ‒ Press keys 0 and 5 for the "Erase fault memory" function and press the Q key to confirm entry.

Note:

If the ignition is switched off between interrogating the fault memory and erasing the fault memory, then the fault memory will not be erased.

• ‒ Press ⇒key.

Automatic test sequence

During test- and assembly work, faults such as detached connectors may also be recognised by other control units. Therefore on completion, the fault memories of all the control units must be interrogated and erased. For this purpose:

• ‒ Press key 0 twice for the address word "Automatic test sequence" and confirm entry with the Q key. The V.A.G 1551 transmits all known address words in sequence.

If a control unit answers with its identification, the number of faults stored or "No fault detected" appears on the display.

Any system faults stored will be displayed in sequence and printed out. The V.A.G 1551 will then transmit the next address word.

• ‒ Erase all fault memories and then carry out a test run.
• ‒ Interrogate the fault memories of all control units again using the "automatic test sequence". No faults must be stored in the fault memory.

If no fault is stored:

• ‒ Press ⇒key.

• ‒ Press keys 0 and 6 for the function "End data transfer" and confirm entry with the Q key.