Automatic test sequence

During test and assembly work malfunctions can be recognized from other control modules like e.g. a 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 Scan Tool transmits all known address words one after another.

When a control module answers with its identification the number of stored DTCs appears on the display or "No DTC recognized".

Any system 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:

Fig 1: Scan Tool Display - Rapid Data Transfer/Blink Code Output

Courtesy of VOLKSWAGEN OF AMERICA, INC.

• Erase all DTC memories and then carry out 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

  Wide open throttle

  Overrun

  must be attained several times.

• At wide open throttle the speed must exceed 3500 RPM.

• Again check DTC memories of all control modules using "automatic test sequence".

  If no DTC is stored:

• Press --> key.

  Indicated on display:

  Fig 2: Scan Tool Display - Rapid Data Transfer

  Courtesy of VOLKSWAGEN OF AMERICA, INC.
• Press keys 0 and 6 for function "End Output" and confirm entry with Q key.