2.2.104. SPN 3031, FMI 0, DEF tank temperature monitoring: DEF tank temperature ABOVE normal.ΒΆ

Description

The measured diesel exhaust fluid (DEF) tank temperature is too high. After too high tank temperature, the DEF need to be changed.

Possible causes are:

  • The DEF tank heating valve is clogged to open or assembled backwards.
  • The DEF tank sensor wiring is defective.
  • The DEF tank sensor is defective.

Reaction in EEM

The FC is stored and the warning lamp is activated. The CAN message indicates an active fault.

Solution

First save the error log and then obey the solutions that follow:

  • Change the DEF (Adblue).
  • Examine the coolant circulation of the DEF tank heating valve; The hoses from the engine to the DEF tank heating valve and back.
  • Try the operation with another tank heating valve to see if the DEF tank heating valve is defective.
  • Examine the DEF tank sensor wiring, the connectors and the contact surfaces of the connector pins (possible oxidation).

NOTE: The DEF tank temperature and level sensors have a common reference GND.

  • Try the operation with another DEF tank sensor to see if the DEF tank sensor is defective.