Test requirements

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 Audi S8, 2003 Audi A8, 2002 Audi S8, 2002 Audi A8, and 2001 Audi S8. However, it is still accessible from the selected car via links, so may be relevant.

Battery voltage at least 11 V
Ground connections at engine and transmission OK
Fuses OK
Ground (GND) connections and Ground point for transmission OK

Check battery Ground (GND) strap and Ground strap between battery and transmission.
Switch ignition off.

NOTE: Data Link Connector is located at left below the driver-side footwell.

Unclip cover for Data Link Connector.
Connect VAS 5051 tester to vehicle with VAS 5051/1 diagnostic wire. Alternately, VAG 1551 Scan Tool can also be attached using VAG 1551/3 adapter.

Fig 1: Connecting VAS 5051 Tester To Vehicle With VAS 5051/1 Diagnostic Wire

Courtesy of AUDI OF AMERICA, INC.

WARNING:

When taking test readings while the vehicle is moving, VAS 5051 tester or VAG 1551 scan tool must always be secured to the rear seat and operated from there by a second technician.
Please observe safety precautions. See SAFETY PRECAUTIONS .

Indicated on display

Fig 2: V.A.G 1551 Scan Tool Display - Connecting VAS 5051 Scan Tool (1 Of 2)

Courtesy of AUDI OF AMERICA, INC.

* Two operating modes are displayed alternately

NOTE: If nothing appears in display:

See Operating instructions of Scan Tool (ST).

Switch ignition on.
Switch printer on via the PRINT button (indicator lamp in button lights up).
Press button 1 to select "Rapid data transfer" operating mode 1.

Indicated on display

Fig 3: V.A.G 1551 Scan Tool Display - Connecting VAS 5051 Scan Tool (2 Of 2)

Courtesy of AUDI OF AMERICA, INC.

NOTE: The address word 00 initiates the automatic test sequence, i.e. it results in a DTC check on all OBD capable systems in the vehicle via rapid data transfer.