Speed Signal, Checking

Speed Signal, Checking

Test requirement:
- Function and display of speedometer OK. Troubleshooting:


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


- Connect diagnostic tester.
- Start engine and let run at idle.
- In diagnostic function "33 - OBD", select "Diagnostic mode 1 - Check measuring values".
- Select the desired measuring value "PID 13 - Vehicle speed".
- Perform a road test, and have a 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. Terminal Resistance For CAN-Bus, Checking

Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1 - Check DTC memory, see Diagnostic mode 3 - Check DTC memory.
2 - Erase DTC memory, see Diagnostic mode 4 -Reset/erase diagnostic data.
3 - Generate readiness code. With Generic Scan Tool