Fuel Level Sensor PCM Input

The PCM supplies 5 volts to the fuel level sensor circuit. The fuel level sensor varies the voltage relative to the amount of fuel in the tank. The PCM monitors the voltage in the fuel level circuit to calculate the amount of fuel in the tank. The fuel level input to the PCM is used to determine if the fuel level in the tank is correct to run the EVAP diagnostic tests. To ensure sufficient volume in the tank to begin the various diagnostic tests, the fuel level must be between 15% and 85%. Refer to EVAP Control System Operation Description for a complete description of the EVAP system. The PCM also sends the fuel level information via class 2 serial data to the instrument panel cluster (IPC). The IPC uses the fuel level information to control the IPC fuel gauge.