Circuit Description

The fuel level sensor changes resistance based on the fuel level. The body control module (BCM) 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 BCM senses a high fuel level sensor signal voltage. When the fuel tank is empty, the fuel level sensor resistance is low and the BCM senses a low fuel level sensor signal voltage. The BCM uses the signal circuit of the fuel level sensor in order to calculate the total remaining fuel in the tank. The BCM sends the fuel level via the class 2 serial data circuit to the instrument panel cluster (IPC) in order to control the fuel gage.