Vehicle Speed Signal, Checking

Additional signals, checking

Speed signal, checking

Recommended special tools and equipment
- VAG1526 multimeter or VAG1715 multimeter
- VAG1594 connector test kit
- Wiring diagram

Test requirements







The respective fuses of Motronic Engine Control Module (ECM) -J220- must be OK.







- Fuses -1, 2, 3, 4 and 7- in protective housing (plenum chamber, left) must be OK:
- Battery voltage must be at least 11.5 Volts.
- Control module with indicator unit in instrument panel insert -J285-must be OK.

Test sequence


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. Diagnostic Tester, Connecting
- Start engine and let run at idle.
- Under address word 33, select "Diagnostic mode 1: Check measured values."
- Select the measuring value "PID 13: Vehicle speed".
- Perform a road test at a speed above 5 km/h and have a second person observe 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:

- Connect test box to control module wiring harness, connect test box for wiring test. Test Box, Connecting For Wiring Test
- Remove instrument cluster
- Check wiring connection from Engine Control Module (ECM, socket 43) to Control module with indicator unit in instrument panel insert.
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
- Generate readiness. Monitors, Trips, Drive Cycles and Readiness Codes