Vehicle Speed Sensor: Testing and Inspection

Speed Signal, Checking

Special tools, testers and auxiliary items required

• Multimeter (VAG1526) or Multimeter (VAG1715)

• Connector test kit (VAG1594)

• Wiring diagram

Test Prerequisites

• The respective fuses of Engine Control Module (ECM) (J623) must be OK:

• Battery voltage must be at least 11.5 Volts.

• Speedometer (G21) must be OK.

Test Sequence

CAUTION!
• Test and measuring 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.

• To test speed signal, vehicle must be driven. Doing this requires a second person.

- Connect diagnostic tester.

- Start engine and let run at idle.

- Under address word 33, select "Diagnostic mode 1: Checking measured values."

- Select the measuring value "PID 13: Vehicle speed".

- Perform a road test, and have the 2nd person observe the indication on the display.

- Check specified value of the vehicle speed:





- End diagnosis and switch ignition off.

If no speed is indicated:

- Check DTC memory.

- Read readiness code => [ Readiness Code, Reading ] Monitors, Trips, Drive Cycles and Readiness Codes. If DTC memory was erased, readiness code must be generated again => [ Readiness Code, Generating ] Monitors, Trips, Drive Cycles and Readiness Codes.