4.2.24. SPN 1077, FMI 31, MPROP control, Powerstage over temperatureΒΆ

Description

The EEM4 system has detected over temperature on high pressure pump control (MPROP).

Possible causes are:

  • The solenoid valve is defective.
  • The solenoid valve wiring is defective.

Reaction in EEM

The FC is stored and the warning lamp is activated. The CAN message indicates active fault. Powerstage functionalities could be disabled.

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 between the low side from the MPROP connector to the ECU connector pin, to see if there is a faulty cable.
  • Check the operation with another MPROP solenoid valve to see if the solenoid valve is defective.