2.2.406. SPN 94, FMI 31, Fuel main filter inlet pressure sensor: ALARM, Pressure out of safe operating range.ΒΆ

Description

The measured fuel pressure in the fuel filter is out of the safe operating range (<3,5bar). Possible causes for the very low pressure indication are:

  • The fuel filters are full.
  • The fuel filter pressure sensor wiring is defective.
  • The fuel filter pressure sensor is defective.
  • A high pressure pump failure.

Reaction in EEM

The FC is stored and the warning lamp is activated. Engine power is heavily reduced (Degradation Level 3). The CAN message indicates an active fault.

Solution

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

  • The fuel filter service. The filters are full and need to be changed.
  • Check the fuel filter pressure sensor wiring, the connectors and the contact surfaces of the connector pins (possible oxidation).
  • Check the operation with another fuel filter pressure sensor to see if the fuel filter pressure sensor is defective.
  • Check the high pressure pump operation and the fuel quality.

See Fuel filter pressure sensor for reference.