4.2.21. SPN 1076, FMI 5, MPROP control, Low side short circuit to high SOURCEΒΆ

Description

The EEM4 system has detected a battery short circuit on the high pressure pump control (MPROP) low side. 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).(see Common Rail high Pressure Pump (MPROP))
  • Measure low side from wiring terminal to the engine ground, to see if there is short circuit to battery.
  • Check the operation with another MPROP solenoid valve to see if the solenoid valve is defective.