Automatic Test Sequence
DTC memories, checking using Automatic Test Sequence (function 00)
Special tools and equipment
- V.A.G 1551 scan tool (or 1552 scan tool) with cable VAG 1551/3
Work sequence
NOTE: All functions which could previously be performed with VAG 1551/1552 can also be performed with the new tester VAS 5051.
The various control modules/components are connected together via a data bus. This is why it is always sensible to check the DTC memory of all control modules first with the "automatic test sequence".
During test and assembly work malfunctions can be recognized from other control modules like e.g. plug disconnected. Therefore on completion the DTC memories of all control modules must be checked and erased. To do this:
- Press key 0 twice for address word "Automatic test sequence" and confirm entry with Q key. VAG 1551 transmits all known address words one after another.
When a control module answers with its identification the number of stored malfunctions appears on the display or "No DTC recognized".
Any system malfunctions that are stored will be displayed one after the other and printed out. The VAG 1551 will then transmit the next address word.
The automatic test sequence has ended when following is indicated on display:
V.A.G On Board Diagnostic HELP
1 - Rapid data transfer*
2 - Flash code output*
- Erase all DTC memories and then perform a road test.
During the road test the following operating conditions must be fulfilled:
- The coolant temperature must exceed 80°C.
- When the temperature is reached, the operating conditions
Idling
Part throttle
Enrichment
Wide open throttle
Overrun
must be attained several times.
- At wide open throttle the speed must exceed 3500 rpm..
- Again check the DTC memories of all control modules using "automatic test sequence".
If no malfunction is stored:
- Press the -> key.
Indicated on display:
Rapid data transfer HELP
Select function XX
- Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
- Switch off ignition.