2.2.146. SPN 3251, FMI 4, Particle filter difference pressure sensor: Voltage below normalΒΆ

Description

The WinEEM monitoring system has detect particle filter difference pressure sensor voltage below normal (<0,25V).

Possible causes are:

  • The particle filter difference pressure sensor wiring is defective. (Shorted to ground)
  • The particle filter difference pressure sensor power supply is not correct.
  • The particle filter difference pressure sensor is defective.

Reaction in EEM

The FC is stored and the fault lamp is activated. The CAN message indicates an active fault. NOTE: The present fault is classified as an emission related fault. Engine power is reduced after a certain time defined by an authority.

Solution

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

  • Check the DPF difference 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 operation with another DPF difference pressure sensor to see if sensor is defective.

See Diesel particulate filter (DPF) difference pressure sensor sensor for reference.