3.2.409. SPN 522308, FMI 31, SCR catalyst inlet gas temp sensor value implausibleΒΆ

Description

The SCR catalyst inlet temperature sensor value is not plausible.

Possible causes are:

  • The SCR catalyst inlet temperature sensor is disconnected.
  • The SCR catalyst inlet temperature sensor wiring is defective.
  • The SCR catalyst inlet temperature sensor is defective.
  • The SCR catalyst inlet temperature sensor is cross-connected with the DOC inlet or the SCR outlet sensor.

Reaction in EEM

The FC is stored and the warning lamp is activated. The CAN message indicates active fault.

NOTE: The present fault is classified as an emission related fault. Engine power will be reduced after a certain time which is defined by an authority.

Solution

  • Check that the SCR catalyst inlet temperature sensor is connected correctly.
  • Check the SCR catalyst inlet temperature sensor wiring, the connectors and the contact surfaces of the connector pins (possible oxidation).
  • Check that the exhaust temperature sensors are not cross-connected.
  • Check the operation with another SCR catalyst inlet temperature sensor to see if the SCR catalyst inlet sensor temperature is defective.