2.2.154. SPN 3362, FMI 7, SCR system: DEF pressure line or dosing valve blockedΒΆ

Description

The EEM monitoring system has detected an SCR system ERROR. The DEF supply module pressure line or the DEF dosing valve is defective.

Possible causes are:

  • The DEF supply module pressure line is defective. (A possible blockage or a mechanical defect.)
  • The DEF dosing valve is blocked.

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:

  • Examine the pressure line visually to detect any mechanical failure eg. if the hose is flattened or frozen.
  • Remove the pressure line from the supply module and perform the dosing test with the service tool to see if the hose is blocked. The fluid should flow out from the pressure line hose.
  • Examine the system visually to detect a possible leakage in the system.
  • Remove the DEF dosing valve and check the nozzle of the dosing valve to see the possible blockage.