Supply pressure sensor – Fuel System
Check the fuel supply pressure sensor, coolant temperature sensor, charge air pressure sensor, charge air temperature sensor and fan speed sensor, along with the connectors and electrical cables in the circuit.
What you'll see
No driver-visible symptom recorded.
System reaction
There is a common power supply for the fuel supply pressure sensor, coolant temperature sensor, charge air pressure sensor, charge air temperature sensor and fan speed sensor. If a fault occurs in one of thesensors, this can affect the circuits of the other sensors.If the voltage is outside the permitted range, the control unit uses a preprogrammed value.The maximum engine torque is limited by approximately 30% as long as the fault is active.
Diagnostic depth
The voltage in the circuit has been above the permitted level.
Possible causes:- Open circuit in the fuel temperature sensor circuit. - The fault may also be caused by a fault on the voltage supply to those components which share their voltage supply. If a fault is indicated on the oil pressure sensor at the same time, there is probably a fault on the shared internal voltage supply.