John Deere 1077 – ECU: Fuel Inj Pump Control Valve Fault

The Engine Control Unit (ECU) has detected a fault with the Fuel Injection Pump Control Valve (also known as the Suction Control Valve) on the high-pressure common rail fuel system. This valve regulates the amount of fuel entering the high-pressure fuel pump to control rail pressure. A malfunction indicates an electrical circuit problem or a mechanical issue preventing accurate fuel flow control, leading to incorrect fuel pressure or a discrepancy between target and actual pressure. Symptoms often include difficulty starting, loss of power, and the engine entering a derated mode.

• 4045 Engine
• 6068 Engine
• 20 Series Tractor
• 6010 Series Tractor
• 6020 Series Tractor
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• 8000 Series Tractor
• 210G Excavator
• 250GLC Excavator
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• Loaders
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• Sprayers

1. 1

   Verify fuel supply level, type, and quality in the tank

2. 2

   Inspect and replace primary and secondary fuel filters, as clogged filters are a primary cause of fuel pressure issues

3. 3

   Visually inspect all low-pressure and high-pressure fuel lines for external leaks

4. 4

   Test the electric lift pump (transfer pump) for proper voltage and verify pressure output is between 0.3–0.6 MPa during cranking

5. 5

   Inspect the wiring harness and electrical connector at the Fuel Injection Pump Control Valve for damage, corrosion, or loose connections

6. 6

   Check for other active fault codes related to fuel pressure sensors or injectors that might indicate a different root cause

1. 1

   Relieve fuel pressure

   Relieve the pressure in the high-pressure fuel system according to the machine's official service manual procedures.

2. 2

   Clean work area

   Thoroughly clean the area around the high-pressure pump and the control valve to prevent contaminants from entering the fuel system.

3. 3

   Disconnect wiring

   Carefully disconnect the electrical connector from the control valve.

4. 4

   Remove control valve

   Remove the retaining bolts securing the control valve to the high-pressure pump and carefully extract the old valve.

5. 5

   Install new valve

   Lubricate the O-rings on the new valve with clean diesel fuel or a suitable lubricant. Insert the valve into the pump and tighten bolts to the manufacturer's specified torque.

6. 6

   Reconnect wiring

   Securely reconnect the electrical connector to the new control valve.

7. 7

   Prime fuel system

   Prime the fuel system to remove all introduced air by cycling the key or using a manual priming pump, following machine-specific procedures.

8. 8

   Test and clear codes

   Start the engine, check for leaks, clear the fault codes using a diagnostic tool, and perform a test under load to verify the repair.