2.2.243. SPN 4376, FMI 4, DEF pump direction valve: Low side short circuit to GROUNDΒΆ

Description

The EEM monitoring system has detected a short circuit to ground on the DEF pump direction valve low side.

Possible causes are:

  • The DEF supply module direction valve 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 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 direction valve 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.