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 dieselengined 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 litres.