2.2.108. SPN 3031, FMI 16, DEF tank temperature monitoring: DEF tank temperature is too high.ΒΆ

Description

The diesel exhaust fluid (DEF) tank sensor is installed in the DEF tank. The DEF tank sensor is an independent unit which measures all the critical parameters of the DEF.

The measured DEF tank temperature is out of operating range.

Possible causes are:

  • The fault is an internal electronic fault of DEF tank sensor.
  • 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:

  • Measure the DEF tank temperature with external measurement device. DEF tank sensor and external measurement device should have equal temperature.
  • 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.