3.2.97. SPN 1761, FMI 31, DEF tank level sensor CAN message missingΒΆ

Description

The AdBlue suction module is installed in the SCR tank. The suction module is an independent unit which measures all the critical parameters of the aqueous urea solution.

The EEM4 monitoring system is not able to detect the DEF tank level sensor CAN message from the bus.

Possible causes are:

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

Solution

  • Check the DEF tank sensor wiring, the connectors and the contact surfaces of the connector pins (possible oxidation).

Save the error log and then erase it. Restart the ECU after erasing the error log. If the fault occurs again during the next driving cycle, check the following paths:

  • Check the operation with another AdBlue suction module.