WIth Generic Scan Tool

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:
- Battery voltage must be at least 11.5 volts.
- Speedometer -G21- must be OK.

Test sequence

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

CAUTION: Secure Scan Tool (ST) on the rear seat and have it operated from there by second technician.

- Connect diagnostic tester. Diagnostic Tester, Connecting
- Start engine and let run at idle.
- Under address word 33, select "Diagnostic mode 1: Checking measuring 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:
- Connect test box to control module wiring harness, connect test box for wiring test. Test Box, Connecting For Wiring Test
- Remove instrument cluster.
- Check wire connection from Engine Control Module (ECM) to Speedometer -G21- according to wiring diagram.
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Readiness Code, Generating