The presupply pressure sensor registers the absolute pressure (presupply pressure and atmospheric pressure together) in the fuel feed after the fuel filter.
The presupply pressure sensor is integrated in the fuel filter housing. The DDE control unit supplies the sensor with ground (M_KND) and a supply voltage of 5 V (U_KND). The sensor outputs a corresponding measurement voltage (E_A_KND) to the DDE control unit.
Fault code 1255 "Presupply pressure sensor" is stored if the presupply pressure has electrical defect.
The presupply pressure sensor is currently not used for monitoring the presupply pressure.