2.2.178. SPN 3521, FMI 31, DEF quality: Fluid is DieselΒΆ

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: The fluid is diesel.

Possible causes are:

  • The DEF tank is filled with diesel.

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:

  • Check the used reducing agent (DEF/AdBlue) quality. If there are any suspicions that a poor quality reducing agent has been used, the tank needs to be emptied and flushed.
  • Refill the DEF tank with valid reducing agent (AdBlue).
  • Check the operation with another DEF suction module.