2.2.177. SPN 3521, FMI 2, DEF quality: DEF property detection errorΒΆ

Description

The DEF suction module is installed in the DEF tank. The suction module is an independent unit which measures all the critical parameters of the aqueous urea solution. The measured DEF quality indicates: An error detected with the urea reagent type detection.

Possible causes are:

  • An internal electronic fault in the suction module.
  • Poor quality reducing agent.
  • The DEF suction module is defective.

Reaction in EEM

The FC is stored and the warning lamp is activated. 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:

  • Add valid DEF to an external can and test the suction module operation.
  • Drain the fluid from the DEF tank.
  • Refill the DEF tank with valid reducing agent (AdBlue).
  • Check the operation with another DEF suction module.