Fuel level gauge
The fuel gauge gives the driver information on how much fuel is in the tank. A level sensor with variable resistance displays a value equivalent to the level of the sensor's float in the fuel tank. In petrol-engined cars, the higher the fuel level, the higher the resistance of the sensor. In diesel-engined cars, the higher the fuel level, the lower the resistance of the sensor. The sensor is connected to the engine control module, which converts the resistance value into a bus message on the fuel level which is transmitted on the P-bus. The CIM forwards the message to the I-bus. The main instrument unit uses the message and converts the value into a filtered, more stable value which is displayed by the fuel level gauge. The main instrument unit transmits the current fuel level on the I-bus. The ICM uses this value for the driving computer function.
The fuel reserve lamp comes on when the fuel quantity is below 10 liters.