Massey Ferguson 651.05 – Engine Control Unit (ECU) / EEM4: Injector Number 1 Low Amp Draw

The engine controller has detected high resistance or a complete open circuit in the electrical circuit for the cylinder #1 fuel injector solenoid. Because the circuit is open, the injector cannot fire, which will result in an engine misfire, rough running, and heavily reduced engine power (Degradation Level 3).

• 4710
• 7724S
• 5712SL
• Interim Tier 4 (2012-2015)
• 7722
• 7722S
• 7615
• 5613
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7616
• 7618
• 5608
• 4708
• 7619
• 7626
• 7726S
• 7624
• 4707
• 4709
• 5711SL
• 7614
• 7718S
• 5610
• 7620
• 7719
• 7714
• 7716S
• T4 (2015-2021)
• 5612
• 7622
• 7720
• Tier 4 (2015-2021)
• 5611
• 7715S
• 5609
• 7724
• 4607
• 4608
• 4609
• 4610
• 5710
• 5711
• 5712
• 5713
• 7617
• 7621
• 7623
• 7625
• 7717
• 7721
• 7723
• 7725

1. 1

   Check the solenoid valve connector at cylinder #1 for loose, pushed-out, or corroded pins.

2. 2

   Disconnect the harness from injector #1 and use a multimeter to measure the resistance across the injector's pins. If the reading shows infinite resistance (OL), the injector's internal coil is open.

3. 3

   If the injector tests within specification, test the injector wiring harness for continuity between the ECU connector and the injector connector. Look for chafed, broken, or melted wires.

1. 1

   Turn off the tractor and disconnect the negative battery cable to prevent electrical shorts.

   Ensure the machine is fully powered down before beginning electrical or fuel system work.

2. 2

   Remove the engine covers/valve cover as necessary to gain access to the fuel injectors and the injector wiring harness.

   Clear access to the top of the engine to reach cylinder #1.

3. 3

   Disconnect the electrical connector from the cylinder #1 fuel injector.

   Prepare the injector or harness for repair/replacement.

4. 4

   If the harness is faulty: Repair the broken wire or replace the engine fuel injector wiring harness.

   Address any open circuits found during the continuity test.

5. 5

   If the injector is faulty: Replace the fuel injector.

   Clean the area around the injector to prevent debris from entering the cylinder. Disconnect the high-pressure fuel line from the injector and cap the rail fitting. Remove the injector hold-down clamp and carefully extract the faulty injector. Install the new injector using new O-rings and copper sealing washers. Reinstall the hold-down clamp and high-pressure fuel line, torquing all fittings to the manufacturer's specifications.

6. 6

   Reconnect the electrical harness to the injector.

   Ensure the connector is fully seated and secure.

7. 7

   Reconnect the battery.

   You may need to prime/bleed the fuel system depending on the engine model.

8. 8

   Connect a diagnostic service tool to the tractor, save the error log, and erase the active EEM4 fault codes.

   Clear the ECU memory of the open circuit fault.

9. 9

   Start the engine and verify that the misfire is gone and no fuel leaks are present.

   Confirm the repair was successful and the engine runs smoothly.