2.2.86. SPN 1761, FMI 31, DEF tank level sensor: AT1TI1 CAN message missing.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 EEM4 monitoring system is not able to detect the DEF tank level sensor CAN message from the CAN bus.

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. Engine power is heavily reduced (Degradation Level 3). The CAN message indicates an active fault.

Solution

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

  • Examine the DEF tank sensor wiring, the connectors and the contact surfaces of the connector pins (possible oxidation).
  • Try operation with another DEF tank sensor.