Automatic Test Sequence

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required





- VAG 1551 scan tool (or vehicle system tester VAG 1552) with VAG 1551/3 adapter cable

NOTE: All functions which could previously be performed with VAG 1551/1552 can also be performed with the vehicle diagnostic, testing and information system VAS 5051.

Work sequence







- Connect VAG 1551 scan tool (or VAG 1552) using VAG 1551/3 adapter cable.

During test and assembly work Diagnostic Trouble Codes (DTCs) can be detected from other control modules like e.g. connector disconnected. Therefore on completion the DTC memories of all control modules must be checked and erased. To do this:
- Press button -0- twice for address word "Automatic test sequence" and confirm entry with -Q- button. The VAG 1551 transmits all known address words one after the other.

When a control module answers with its identification the number of stored Diagnostic Trouble Codes (DTCs) appears on the display or "No fault detected".

Any system Diagnostic Trouble Codes (DTCs) 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:


Rapid data transfer HELP
Select function XX


- Erase all DTC memories and then perform a road test.

Observe the valid safety precautions when carrying out a road test Technician Safety Information.

During the road test the following operating conditions must be fulfilled:
- The coolant temperature must exceed 85 degrees C.
- When the temperature is reached, the operating conditions Idling, Part throttle, Full throttle, Overrun must be attained several times.
- At full throttle the speed must exceed 3500 rpm.
- Again check the DTC memories of all control modules using the "automatic test sequence".

If no DTC is stored:
- Press the -> button.

Indicated on display:


Rapid data transfer HELP
Select function XX


- Press buttons -0- and -6- for the function "End output" and confirm entry with the -Q- button.
- Switch off ignition.