3.2.401. SPN 522212, FMI 31, DEF dosing valve after cooler current above normal or short to GROUNDΒΆ

Description

The DEF dosing valve after cooler current is above the normal operating range.

Possible causes are:

  • The DEF dosing valve after cooler wiring is defective. (Shorted to ground.)
  • The DEF dosing valve after cooler 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 after cooler wiring, the connectors and the contact surfaces of the connector pins (possible oxidation).
  • Check the operation with another DEF dosing valve after cooler to see if the after cooler is defective.