2.2.188. SPN 4332, FMI 1, SCR system: DEF pressure build up failureΒΆ

Description

The EEM monitoring system has detected an SCR system ERROR. The SCR system cannot be pressurized.

Possible causes are:

  • The DEF supply module pressure connector is blocked.
  • The DEF supply module pressure hose is blocked.
  • The DEF dosing module is blocked.
  • The DEF supply module inlet connector pre-filter is blocked.
  • The DEF supply module inlet hose is blocked.
  • The filter in the DEF tank sensor is blocked.
  • A possible leakage in the system.

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 DEF dosing valve and check the nozzle of the dosing valve to see the possible blockage.
  • Examine the DEF supply module connectors to see the possible blockage.
  • Examine the inlet line visually to detect any mechanical failure eg. if the hose is flattened or frozen.
  • Change the DEF tank suction filter.
  • Check the used reducing agent for contamination and change it if necessary.