Circuit Description

The fuel level sensor changes resistance in response to the fuel level. The PCM monitors the signal circuit of the fuel level sensor in order to determine the fuel level. When the fuel tank is full, the fuel level sensor resistance is high and the PCM senses a high fuel level sensor signal circuit voltage. When the fuel tank is empty, the fuel level sensor resistance is low and the PCM senses a low fuel level sensor signal circuit voltage. The PCM uses the signal circuit of the fuel level sensor in order to calculate the percentage of remaining fuel in the fuel tank. The PCM sends the fuel level percentage via the fuel level signal circuit to the instrument panel cluster (IPC) in order to control the fuel gage.

This diagnostic table tests for a stuck fuel level sensor. The PCM sets this DTC if the fuel level sensor appears to be stuck, based on a lack of fuel level sensor signal variation expected during normal operation.