Speedometer Vehicle Speed Sensor (VSS) -G22-, checking

If the speedometer is inoperative:

Check for speedometer vehicle speed sensor signal input to instrument cluster as follows:
Connect scan tool. Refer to VAG 1551/1552 Scan Tool (ST), VAS 5051 Vehicle Diagnostic Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System, connecting and selecting functions .
Select "Read Measuring Value Block" function 08. Refer to Read Measuring Value Block (function 08) .
Select channel 001 and carry out road test.

WARNING:

When taking test readings while the vehicle is moving, VAG 1551/1552 or VAS 5052 Tool must always be secured to the rear seat and operated from this position.
DO NOT USE VAS 5051 during a road test.

If speed signal is indicated on scan tool, the instrument cluster is malfunctioning and must be replaced.

Remove instrument cluster. Refer to Instrument cluster, removing and installing .

If speed signal is not indicated on scan tool, check signal at multi-pin terminal on rear of instrument cluster as follows:

Remove instrument cluster. Refer to Instrument cluster, removing and installing .
Connect test box VAG 1598 to blue 32-pin connector using adapter cable VAG 1598/25.
Perform an acoustic continuity test of wire and sensor using multimeter between socket 28 and socket 9 (load Ground)
Switch ignition off.

NOTE: For the Audi TT, the vehicle speed signal is generated by a hall effect sensor. Therefore, there must be battery voltage (about 12V) at the speedometer Vehicle Speed Sensor (VSS) -G22- during test.

Test:

Signal of continuity tester must switch off and on repeatedly while vehicle is rolled back and forth approximately 1 meter (1 yard).

If test is not OK:

Check wiring connection to speedometer vehicle speed sensor using applicable wiring diagram.

If test is OK:

Replace speedometer vehicle speed sensor.