Fuel Level Signal, Checking

NOTE:
- If there is too little fuel in the fuel reservoir (less than 2 gallons) combustion misfiring and/or fuel system malfunctions could occur. In this case the malfunction "Fuel level too low" is stored in the DTC memory (SAE P1250/VAG 17658).
- This malfunction always occurs with combustion misfiring or fuel system malfunctions.
- In general eliminate all other malfunctions first.


- Fill fuel tank of vehicle (at least 20 ltr, or 5.25 gal).
- Check and then erase DTC memory.
- Check readiness code.
- Generate new readiness code.
- Conduct a test drive ( See Safety precautions , Technician Safety Information ).
- Check DTC memory of ECM.

If only the DTC "Fuel level too low" (SAEP1250/VAG 17658) is stored in the DTC memory.







- Connect VAG 1598/22 test box to ECM harness connector.
- Check wire from terminal 21 of test box to instrument cluster for open circuit or short circuit per wiring diagram.