2.2.168. SPN 3516, FMI 2, DEF quality sensor: Optical 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: The quality sensor optical data is incorrect.

Possible causes are:

  • The fault is an internal electronic fault in the suction module.

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 AdBlue 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.