Diagnostic Aids
WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
When inspecting for a deformed or a warped fuel tank, measure the resistance of the suspect fuel level sensor at empty, with the sensor in the fuel tank, and again with the sensor removed from the fuel tank. The measured resistance values should be the same at empty. If the measured resistance values are not the same, refer to FUEL TANKS (WITH FEEDBACK FUEL SYSTEM)
or
or FUEL TANKS (WITHOUT FEEDBACK FUEL SYSTEM)
in Engine Performance.
- Depending on the current fuel level, it may be difficult to locate a malfunctioning sending unit. The malfunction may only occur when the fuel level is full or near empty. The fuel sending unit may need to be removed for further diagnosis. A fuel level sensor that has an intermittent condition causes this DTC to set. Remove the fuel level sensor in order to test the resistance of the sensor. Refer to FUEL SENDER (WITHOUT FEEDBACK FUEL SYSTEM) or FUEL SENDER ASSEMBLY (WITH FEEDBACK FUEL SYSTEM) in Engine Controls. The resistance of the sensor should change from 40 to 250 ohms as the float arm is moved from the empty to full positions. Replace the sensor if the resistance did not change or is out of range.
- The following occurs with this DTC set:
- The vehicle fuel gage displays empty.
- The check gage lamp illuminates.
- The driver information center displays a message.
- The PCM will not reset the mileage for this diagnostic if the fuel tanks are re-fueled to the same level as before the repair was made. Perform the following procedure in order to re-fuel the vehicle after replacing a sending unit or fuel tank:
- Add 25 percent of the fuel that you removed before the repair.
- Start the engine and idle for 5 minutes.
- Turn OFF the engine.
- Add the remainder of the fuel.
- Test for an intermittent condition. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS in Wiring Systems.
The voltages in the Fuel Level Conversion Table are approximate values. Use this table to aid in diagnosis.