2.2.237. SPN 4375, FMI 3, DEF pump motor: Control signal short circuit to HIGH SOURCE.ΒΆ

Description

The EEM monitoring system has detected a short circuit to the DEF pump control signal.

Possible causes are:

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

Reaction in EEM

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

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

Solution

First save the error log and then do the procedure that follows:

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

See Supply module sensor for reference.