Massey Ferguson 1077.04 – Engine ECU: Fuel Solenoid On High Pressure Pump Issue

MPROP control, Metering unit AD-channel voltage below normal or a short to ground on the low side. Can also trigger an ECU internal fault 0102, indicating an internal hardware failure on the high-pressure unit control circuit.

• 7616
• 5612
• 7622
• Interim Tier 4 (2012-2015)
• 7614
• 5611
• 7615
• 5610
• 5613
• 7620
• 5609
• 7618
• 5608
• 7619
• 7626
• 7624
• 7600 Series Interim Tier 4 (2012-2015)

1. 1

   System Reset: Turn the ignition off for a minimum of 60 seconds, then turn it back on to see if the code clears or returns as active.

2. 2

   Wiring & Connector Inspection: Inspect the wiring harness between the Engine ECU and the MPROP valve on the high-pressure fuel pump. Look for chafing, melted insulation, or a short circuit to ground.

3. 3

   Pin Check: Disconnect the MPROP valve and the ECU connectors. Check for corrosion, moisture, or pushed-out pins.

4. 4

   Component Testing: Test the MPROP solenoid for an internal short to ground.

5. 5

   ECU Verification: If the wiring harness and the MPROP valve test perfectly fine, the Engine ECU itself has likely failed internally (ECU internal fault 0102).

1. 1

   Disconnect Power

   Disconnect the tractor's battery before servicing the fuel system or ECU to prevent further electrical damage.

2. 2

   Harness Repair

   If a short to ground is found in the wiring harness leading to the high-pressure pump, repair the damaged section using weather-sealed splices or replace the harness section.

3. 3

   MPROP Valve Replacement

   If the MPROP valve is internally shorted, thoroughly clean the area around the high-pressure fuel pump to prevent contamination. Remove the mounting bolts for the MPROP valve, extract the old valve, lubricate the O-rings on the new valve with clean diesel fuel, and install it.

4. 4

   ECU Replacement

   If the wiring and valve are fully functional, the Engine ECU has suffered an internal hardware failure on the high-pressure control circuit. The ECU must be replaced and flashed/reprogrammed by an authorized dealer to match the tractor's engine serial number and immobilizer.

5. 5

   Clear Codes

   Reconnect the battery, turn the key on, and use a diagnostic tool (like WinEEM4 or an AGCO EDT) to clear the inactive fault codes.