4.2.175. SPN 4375, FMI 4, DEF pump motor control signal short circuit to GROUNDΒΆ

Description

EEM4 monitoring system has detected short circuit to DEF pump control signal.

Possible causes are:

  • The DEF supply module wiring is defective. (Shorted to ground.)
  • The DEF supply module is defective.

Reaction in EEM

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

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

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 supply module wiring, the connectors and the contact surfaces of the connector pins (possible oxidation). (see Supply module)
  • Check the operation with another DEF supply module to see if the supply module is defective.