2.2.228. SPN 4360, FMI 7, SCR catalyst inlet gas temp sensor: Value out of the limits during engine start.ΒΆ

Description

The SCR catalyst inlet gas temperature sensor value is not plausible. The SCR catalyst inlet gas temperature is compared against other exhaust gas temperature sensors during engine start.

Possible causes are:

  • The SCR catalyst inlet gas temperature sensor is cross-connected with the DOC inlet, DOC outlet or the SCR outlet sensor.
  • The SCR catalyst inlet gas temperature sensor is disconnected.
  • The SCR catalyst inlet gas temperature sensor is removed from the exhaust line.
  • The SCR catalyst inlet gas temperature sensor wiring is defective.
  • The SCR catalyst inlet gas temperature sensor is defective.

Reaction in EEM

The FC is stored and the warning 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 which is defined by an authority.

Solution

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

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