Circuit Description

The fuel level sensor changes resistance based on 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 voltage. When the fuel tank is empty, the fuel level sensor resistance is low and the PCM senses a low fuel level sensor signal voltage. The PCM uses the signal circuit of the fuel level sensor in order to calculate the percentage of remaining fuel in the 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.

The PCM monitors the voltage on the fuel level signal circuit. The PCM sets this DTC if the fuel level signal circuit to the IPC becomes open or shorted to ground.