Fuel Level Signal: Testing and Inspection

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 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.Refer to "Moniters, Trips and/or Drive Cycle (Readiness Codes)/Checking Readiness Code" Testing and Inspection
- Generate new readiness code.Refer to "Moniters, Trips and/or Drive Cycle (Readiness Codes)/Generating Readiness Code Testing and Inspection
- Conduct a test drive ( See Safety precautions).
- Check DTC memory of ECM.
If only the DTC "Fuel Level Too Low" (SAE P1250/VAG 17658) is stored in DTC memory:







- Connect VAG 1598/22 test box to ECM harness connector.Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG 1598/22 Test Box" Testing and Inspection
- Check wire from terminal 21 of test box to instrument cluster for open circuit or short circuit per wiring diagram.