Massey Ferguson 000652.05 – ECU: Injector Number 2 Low Amp Draw

The Engine Control Unit (ECU) has detected an insufficient electrical current (low amp draw) in the circuit for the number 2 fuel injector. This condition indicates an open circuit or high resistance, meaning there is an issue with the electrical current supplied to the injector. This lack of current can prevent the injector from opening correctly, impairing its proper operation and leading to various engine performance issues.

• 4707
• 4708
• 4709
• 4710
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 5710
• 5711
• 5712 SL
• 5713 SL
• 6711
• 6712
• 6713
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 7714
• 7714 S
• 7715
• 7715 S
• 7716
• 7716 S
• 7718
• 7718 S
• 7719
• 7719 S
• 7720
• 7720 S
• 7722
• 7722 S
• 7724
• 7724 S
• 7726
• 7726 S

1. 1

   Visually inspect the wiring harness and connector for the number 2 injector for any signs of damage, corrosion, or loose connections.

2. 2

   Ensure the diesel fuel is clean and not contaminated with water or debris, which can cause symptoms mimicking an injector fault.

3. 3

   Perform an Injector Coil Resistance Test: Disconnect the electrical connector from the number 2 injector and measure resistance across the two terminals. A reading of 'OL' or infinite resistance indicates an open circuit within the injector coil (requires replacement).

4. 4

   Perform a Wiring Harness Continuity and Short Circuit Test: With the injector and ECU disconnected, check continuity of the two wires between the ECU and injector connectors. Also, check for a short to ground (continuity to chassis) and a short to power.

5. 5

   Perform a Voltage Supply Test: Turn ignition on (engine off), reconnect the injector connector, and back-probe the power supply wire to verify battery voltage is present.

6. 6

   Perform an ECU Driver Signal Test: Connect a 12-volt test light between the two wires of the injector connector and crank the engine. The light should flash, indicating the ECU is sending a pulsing ground signal. If it does not flash and wiring is good, the ECU injector driver circuit may be faulty.

7. 7

   Perform a Cylinder Isolation Test (if engine is running): Disconnect the electrical connector to the number 2 injector and listen for a change in engine speed or smoothness to confirm if the cylinder is contributing to engine power.

1. 1

   Preparation

   Thoroughly clean the area around the fuel injector to prevent dirt and debris from entering the engine or fuel system.

2. 2

   Disconnect Battery

   Disconnect the negative battery terminal as a safety precaution.

3. 3

   Relieve Fuel Pressure

   If applicable to the specific fuel system, relieve the fuel pressure according to the manufacturer's instructions.

4. 4

   Remove Fuel Lines

   Disconnect the high-pressure fuel line and the fuel leak-off pipe from the injector. Be sure to use a backup wrench to prevent damage to the fittings. Cap the open fuel lines and injector ports immediately to prevent contamination.

5. 5

   Remove Injector

   Remove the nuts or bolts securing the injector hold-down clamp and carefully remove the injector from the cylinder head. It may be a friction fit and require gentle prying or a specialized puller tool.

6. 6

   Clean Injector Bore

   Clean the injector bore in the cylinder head to ensure a good seal for the new injector.

7. 7

   Install New Injector

   Install the new injector with a new copper sealing washer.

8. 8

   Torque to Specification

   Tighten the injector hold-down nuts or bolts to the manufacturer's specified torque.

9. 9

   Reconnect Fuel Lines

   Reconnect the high-pressure fuel line and the leak-off pipe.

10. 10

    Bleed the Fuel System

    If necessary, bleed the fuel system to remove any air that may have entered.

11. 11

    Final Checks

    Reconnect the battery, clear any fault codes with a diagnostic tool, and start the engine. Check for any fuel leaks and ensure the engine is running smoothly.