Test conditions

Battery voltage at least 11 V
Ground connections for transmission and engine OK
Fuses OK
See appropriate System Wiring Diagrams article.
Ground connection for transmission OK
See appropriate System Wiring Diagrams article.

Check battery Ground connection between battery and transmission
Switch off ignition
Connect VAG 1551 Scan Tool (ST) with adapter cable VAG 1551/3.

Fig 1: Connecting VAG 1551 Scan Tool To Data Link Connector
Courtesy of AUDI OF AMERICA, INC.
CAUTION:
- During road tests perform measurements or tests only from the rear seat by a second technician.
- All occupants must wear seat belts.
- Secure test equipment to prevent it from being dislodged in case of an accident.
- Switch off ignition before connecting or disconnecting test equipment.
Indicated on display:

Fig 2: VAG 1551, 1552 Scan Tool Display - Connecting And Selecting Functions (1 Of 2)
Courtesy of AUDI OF AMERICA, INC.

* is displayed alternately

NOTE: If display remains blank: See Operating instruction for VAG 1551 Scan Tool (ST).
Switch on ignition.
Switch on printer with PRINT button. Control light in button will light up.
Press button 1 for "Rapid data transfer."
Indicated on display:

Fig 3: VAG 1551, 1552 Scan Tool Display - Connecting And Selecting Functions (2 Of 2)
Courtesy of AUDI OF AMERICA, INC.

NOTE: With address word 00, the automatic test sequence is initiated, starting with checking the Diagnostic Trouble Code (DTC) memory of all sensors and components in the vehicle that are monitored by the OBD system using rapid data transfer.