2.2.214. SPN 4344, FMI 7, DEF supply module: Heater temperature signal in failure rangeΒΆ

Description

The Measured DEF supply module temperature signal is out of the operating range.

Possible causes are:

  • The DEF supply module internal temperature sensor is defective.
  • The DEF supply module wiring is defective.
  • The DEF supply module is defective.

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 defined by an authority.

Solution

First save the error log and then do the procedure that follows:

  • Examine the DEF supply module wiring, the connectors and the contact surfaces of the connector pins (possible oxidation).
  • Test the operation with another DEF supply module to see if the supply module is defective.

See Supply module sensor for reference.