3.2.20. SPN 1076, FMI 3, MPROP control, high side short circuit to HIGH SOURCEΒΆ

Description

The EEM4 system has detected a battery short circuit on the high pressure pump control (MPROP) high side. The fault was detected in the afterrun when the MPROP control was turned off. Possible causes are:

  • The solenoid valve connector is defective.
  • The solenoid valve wiring is defective.
  • The solenoid valve 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 solenoid valve wiring, the connectors and the contact surfaces of the connector pins (possible oxidation).
  • Measure the high side from the wiring terminal to the engine ground, to see if there is a battery short circuit.
  • Check the operation with another MPROP solenoid valve to see if the solenoid valve is defective.

See Common Rail high Pressure Pump (MPROP) for reference.