3.2.178. SPN 3519, FMI 3, DEF tank sensor open circuitΒΆ

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 measured DEF tank temperature indicates: A DEF tank temperature sensor open circuit.

Possible causes are:

  • The fault is an internal electronic fault in the suction module. The fluid temperature measuring circuit is faulty (open).

Reaction in EEM

The FC is stored and the warning lamp is activated.

NOTE: The present fault is classified as an emission related fault. Engine power will be reduced after a certain time which is defined by an authority.

Solution

  • Check the AdBlue suction module 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.