2.2.52. SPN 1381, FMI 3, Fuel supply pump inlet pressure sensor: Electrical signal above normal, possible reason is open circuit.ΒΆ

Description

The measured fuel supply pump pressure signal is above the normal operating range (> 4,7 V) or open circuit.

Possible causes are:

  • The fuel supply pump pressure sensor wiring is defective.
  • The fuel supply pump pressure sensor power supply is not correct.
  • The fuel supply pump pressure sensor is defective.

Reaction in EEM

The FC is stored and the warning lamp is activated. Engine power is reduced (Degradation Level 1). The CAN message indicates an active fault. The engine functions dependent on the fuel supply pump pressure are not active.

Solution

First save the error log and then do the procedure that follows:

  • Check the fuel supply pump pressure sensor wiring, the connectors and the contact surfaces of the connector pins (possible oxidation).
  • Check the 5 V power supply to the sensor.
  • Check the operation with another pressure sensor to see if the fuel filter pressure sensor is defective.

See Fuel supply pump inlet pressure sensor for reference.