The tank content is measured with two lever sensors which are separately linked to the instrument cluster. Each lever sensor is connected with a separate ground (analog ground) and a sensor line (analog positive) to the instrument cluster. There is no reserve contact in the level sending unit to activate the fuel reserve warning lamp. The fuel reserve warning lamp is switched on dependent on the tank contents in comparison with a reserve threshold value.
The "fuel reserve" signal is output as information for engine management. It is coupled to the fuel reserve warning lamp and is switched on for 2 seconds as a function check when switching on terminal 15 (pre-drive check).
The different methods of determining the fuel level for each tank half is adapted by means of the coding data.