Circuit/System Description

For an overview of the component/system, refer to:Instrument Cluster Description and Operation

Circuit	Description
Fuel Level Sensor Signal	The control module input circuit has an internal resistance connected to 5 V.
Low Reference	Grounded through the control module.

Component	Description
B46 Fuel Level Sensor	The resistance of the sensor changes with fluid level.
K20 Engine Control Module	The K20 Engine Control Module monitors the fuel level sensor. When the fuel tank is full, the resistances of the fuel level sensor is low and the 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 control module senses a high signal voltage. The K20 Engine Control Module converts the signal input to a fuel level value.

Component

Description

B46 Fuel Level Sensor

The resistance of the sensor changes with fluid level.

K20 Engine Control Module

The K20 Engine Control Module monitors the fuel level sensor.
When the fuel tank is full, the resistances of the fuel level sensor is low and the 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 control module senses a high signal voltage.
The K20 Engine Control Module converts the signal input to a fuel level value.