2.2.255. SPN 4792, FMI 0, EAT Monitoring: Clogged SCRΒΆ

Description

The EEM monitoring system has detected an blockage in SCR. Too high exhaust back pressure detected.

Possible causes are:

  • Deposit or blockage in the SCR catalyst.

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:

  • Perform a catalyst cleanup with the WinEEM service tool.
  • Examine the DEF system operation. Make sure the SCR system is able to dose a correct amount of the DEF.
  • Examine the SCR catalyst condition. Remove the dosing valve and look inside the catalyst. Try to see the possible DEF deposit problem or blockage.