Circuit / System Description

The fuel level sensor changes resistance based on fuel level. The Fuel Pump Driver Control Module monitors the signal circuit of the fuel level sensor and sends the signal information to the K20 Engine Control Module / K45 Powertrain Control Module for all further handling. The K20 Engine Control Module / K45 Powertrain Control Module uses this value in order to determine the fuel level. When the fuel tank is full, the resistance of the fuel level sensor is low and the K20 Engine Control Module / K45 Powertrain Control Module senses a low signal voltage on the signal circuit of the fuel level sensor. When the fuel tank is empty, the resistance of the fuel level sensor is high and the K20 Engine Control Module / K45 Powertrain Control Module senses a high signal voltage. The K20 Engine Control Module / K45 Powertrain Control Module uses the signal circuit of the fuel level sensor in order to calculate the percentage of remaining fuel in the tank. The Fuel Pump Driver Control Module sends the fuel level percentage via High Speed CAN-Bus to the body control module (BCM). The BCM then sends the fuel level percentage via Low Speed CAN-Bus to the driver information display in order to control the fuel gauge.