2.2.405. SPN 94, FMI 3, Fuel main filter inlet pressure sensor: Electrical signal above normal, possible reason is open circuitΒΆ

Description

The measured fuel filter pressure signal is above the normal operating range (> 4,6 V).

Possible causes are:

  • The fuel filter pressure sensor wiring is defective.
  • The fuel filter pressure sensor power supply is not correct.
  • The fuel filter 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. Engine functions that depend on the fuel filter pressure are not active.

Solution

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

  • Check the fuel filter 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 fuel filter pressure sensor to see if the fuel filter pressure sensor is defective.

See Fuel filter pressure sensor for reference.