4.2.107. SPN 3361, FMI 31, DEF dosing valve powerstage driver chip over temperatureΒΆ

Description

EEM4 monitoring system has detected over temperature on DEF dosing valve powerstage.

Possible causes are:

  • The DEF dosing valve wiring is defective.
  • The DEF dosing valve is defective
  • The control unit is defective

Reaction in EEM

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

Solution

First 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 DEF dosing valve wiring, the connectors and the contact surfaces of the connector pins (possible oxidation). (see Dosing module)
  • Check the operation with another dosing valve to see if the valve is defective.
  • Check the ECU operation with another EEM4 controller. If the system is functional and the fault is not active with the replacement ECU, then the original ECU is defective.