2.2.196. SPN 4334, FMI 4, DEF pressure sensor: Electrical signal below normal, possible reason is short to ground.ΒΆ

Description

The measured DEF supply module pressure sensor signal is below the normal operating range.

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 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.