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

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 VAG 1551 scan tool. Connecting VAG 1551/VAS 5051
- Select "Read Measuring Value Block" function 08. Reading
- Select channel 001 and carry out road test.

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

If the speedometer vehicle speed sensor signal is indicated on the VAG 1551 Scan Tool display, the instrument cluster is malfunctioning and must be replaced.

If the speedometer vehicle speed sensor signal is NOT displayed on the VAG 1551 Scan Tool display, the signal must be checked at the multi-pin terminal on the rear of the instrument cluster as follows:

- Remove instrument cluster.
- 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 VAG1526 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 12 V) 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.