Speed Signal, Checking

Speed Signal, Checking

Recommended special tools and equipment
- V.A.G 1526 multimeter or V.A.G 1715 multimeter
- V.A.G 1594 connector test kit
- Wiring diagram

Test requirements
- Fuses on E-box in engine compartment, left side, must be OK.

NOTE: Fuses on this fuse holder are labelled "SB" in the wiring diagram.







- Fuses on fuse holder in instrument panel, left side, must be OK.

NOTE: Fuses on this fuse holder are labelled "SC" in the wiring diagram.

- Instrument Cluster Control Module -J285- must be OK.
- Data Bus On Board Diagnostic Interface -J533- must be OK.
- Speedometer -G21- must be OK.
- Battery voltage must be at least 11.5 Volts.

Function test

NOTE: To check the speed signal, vehicle must be driven at a speed above 5 km/h.

Observe the safety precautions that apply to road tests.
- 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 ($D): Vehicle speed".
- Perform a road test at a speed above 5 km/h while a 2nd person observes the indication on the display.
- Check specified value of the vehicle speed:







NOTE: Vehicle speed must not drop to below 5 km/h during test.

- End road test and switch ignition off.

If no speed is indicated:
- Check terminal resistance of CAN-Bus.
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes