Vehicle Speed Sensor: Testing and Inspection

Speed Signal, Checking

Special Tools and Equipment







- VAG1526A
- VAG1594A
- VAG1598A
- VAG1598/25
- VAS5051 with VAG5051/1

Test requirement:
- VAS5O51 tester connected.

Test sequence


WARNING!
- Test equipment must always be secured to the rear seat and operated from there by a second person.
- If test and measuring equipment is operated from the passenger seat, the person seated there could be injured in the event of an accident involving deployment of the passenger-side airbag.


If a malfunction of the RPM display at tachometer is detected, signal at the tachometer must be checked.

- Read measuring value block display group 001.
- Perform a road test.







- Check indication in display field -1-.
- Specification: The current speed must be indicated (compare with speedometer)

If the speed is being indicated, but not at instrument cluster:
- Replace instrument cluster.

If the speed is not indicated:
- Remove instrument cluster.
- Connect VAG1598A test box to blue 32-pin multi-pin harness connector using VAG 1598/25 adapter.
- Raise vehicle -via lift if possible-, until the front left wheel is free.
- Connect multimeter between terminal 28 and 9 for continuity test:
- Turn left front wheel.
- The multimeter must deliver short whistling signals.

If test is not OK:
- Check wire connection between instrument cluster and speed sensor according to wiring diagram.

If no malfunctions are found in wire:
- Replace speed sensor.