Massey Ferguson 1077.03 – Engine Control Unit (ECU): Fuel Solenoid On High Pressure Pump Issue

MPROP control (Metering unit) AD-channel voltage is above normal. This typically indicates that the Engine Control Unit has detected a short circuit to a high voltage source (Battery +) or an open circuit in the solenoid's wiring.

• 7616
• 5612
• 7622
• Interim Tier 4 (2012-2015)
• 7614
• 5611
• 7615
• 5610
• 5613
• 7620
• 5609
• 7618
• 5608
• 7619
• 7626
• 7624
• 7714
• 7715
• 7716
• 7718
• 7719
• 7720
• 7722
• 7724
• 7726
• 4700 Series
• 5600 Series
• 5700SL Series
• 8600 Series

1. 1

   Inspect the wiring harness and connector at the MPROP solenoid (located on the high-pressure fuel pump) for chafing, melted insulation, or disconnected pins.

2. 2

   Use a multimeter to test the MPROP circuit between the solenoid connector and the Engine ECU. Check for a short to battery voltage (B+) or an open circuit.

3. 3

   Measure the resistance of the MPROP solenoid coil to verify it is not internally shorted or open.

4. 4

   Connect the AGCO Service Tool (WinEEM4) and run the high-pressure pump test function to monitor commanded vs. actual rail pressure and check for pump leakage.

1. 1

   Disconnect Power

   Disconnect the tractor's battery to prevent electrical spikes during repair.

2. 2

   Repair Wiring

   If the diagnostic checks revealed a short to power or an open wire in the harness, repair the damaged section of the wiring or replace the pigtail connector.

3. 3

   Replace the MPROP Valve

   If the wiring is intact but the solenoid failed the resistance test, the MPROP valve must be replaced. Clean the area around the high-pressure pump thoroughly, unplug the electrical connector, remove the mounting screws, and carefully extract the valve. Lubricate the O-rings on the new MPROP valve with clean diesel fuel and install it into the pump. Torque the fasteners to OEM specifications.

4. 4

   Reassemble and Bleed

   Reconnect the electrical connector and the battery. Prime the low-pressure fuel system to remove any introduced air.

5. 5

   Clear Codes

   Use the AGCO Service Tool to clear the 001077.03 / SPN 1077 FMI 3 fault code. Start the engine and verify that the fuel rail pressure matches the ECU's target pressure.