Speed Signal, Checking

Speed Signal, Checking

Test requirement:
- Function and display of speedometer OK.

WARNING: To reduce the risk of accident during road tests, always observe safety precautions.

- Connect diagnostic tester. VAS 5051, Connecting and Select Functions
- Start engine and let run at idle.
- In diagnostic function "33 - OBD", select "Diagnostic mode 1 - Check measuring values".
- Select desired measuring value "PID 13 - Vehicle speed".
- Perform a road test, and have the 2nd person observe the indication on the display.







- End diagnosis and switch ignition off.

If no speed is displayed:
- Check terminal resistance for CAN-Bus.

Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1. Check DTC memory, Diagnostic mode 3 - Check DTC memory. Diagnostic Mode 03 - Read DTC Memory
2. Erase DTC memory, Diagnostic mode 4 - Reset/erase diagnostic data. Diagnostic Mode 04 - Erase DTC Memory
3. If DTC memory was erased, generate readiness code.

- End diagnosis and switch ignition off.