Diagnostic Trouble Code (DTC) memory, checking and erasing: Notes

WARNING: This page is about a different car, the 2003 Audi S6 and 2002 Audi S6. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: If no DTC is stored in the DTC memory the DTC memory should not be erased unnecessarily as the readiness code is reset.

Connect Vehicle Diagnostic, Testing and Information System VAS 5051 or V.A.G 1551 Scan Tool and select engine electronics control module with "Address word" 01. See VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS 5051, CONNECTING AND SELECTING ENGINE CONTROL MODULE or V.A.G 1551 SCAN TOOL, CONNECTING AND SELECTING ENGINE CONTROL MODULE . For this purpose, engine must be running at idle speed.
Switch on printer using the Print key (Warning lamp in switch illuminates).

Indicated on display

Fig 1: VAG 1551 Scan Tool Display - Diagnostic Trouble Code (DTC) Memory (1 Of 5)

Courtesy of AUDI OF AMERICA, INC.

Operate Scan Tool, taking into account information on display.
Press keys 0 and 2 for "Check DTC memory" function and press Q key to confirm entry.

The display shows the number of stored malfunctions or "No DTC detected!".

Fig 2: VAG 1551 Scan Tool Display - Diagnostic Trouble Code (DTC) Memory (2 Of 5)

Courtesy of AUDI OF AMERICA, INC.

If no DTC is stored:

Press -->key.

If one or more DTCs are stored:

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

The display then shows:

Fig 3: VAG 1551 Scan Tool Display - Diagnostic Trouble Code (DTC) Memory (3 Of 5)

Courtesy of AUDI OF AMERICA, INC.

Locate and eliminate DTCs listed on printout as per DTC table. See DIAGNOSTIC TROUBLE CODE (DTC) TABLE .
Press keys 0 and 5 for "Erase DTC memory" function and press Q key to confirm entry.

Indicated on display

Fig 4: VAG 1551 Scan Tool Display - Diagnostic Trouble Code (DTC) Memory (4 Of 5)

Courtesy of AUDI OF AMERICA, INC.

NOTE: If the ignition is switched off between checking the DTC memory and erasing the DTC memory, then the DTC memory will not be erased. It is therefore important to follow the procedure exactly, i.e. first check the DTC memory and then erase it.

Press -->key.

Indicated on display

Fig 5: VAG 1551 Scan Tool Display - Diagnostic Trouble Code (DTC) Memory (5 Of 5)

Courtesy of AUDI OF AMERICA, INC.

Press keys 0 and 6 for the "End output" function and press Q key to confirm entry.

NOTE: During test and assembly work, malfunctions such as separated connectors may also be recognized by other control modules. Therefore on completion, the DTC memories of all the control modules must be checked and erased. The automatic test sequence must be performed.