New Holland ENG 3200 – Engine ECU: Injector Cylinder 4 Warning - Open Load

The engine control module has detected an open circuit in the electrical circuit for the fuel injector on cylinder #4. This means electrical current cannot flow through the circuit, which is typically caused by a broken wire, a disconnected or corroded plug, or a failed (burnt out/open) solenoid coil inside the injector itself.

• L220
• L225
• L230
• C227
• C232
• C238
• SR200
• SV250
• TR320
• T4.75
• T4.85
• T4.95
• T4.105
• T4.115
• T5.95
• T5.105
• T5.115
• TD5 Series
• Workmaster series

1. 1

   Inspect the wiring harness running from the Engine ECU to the cylinder 4 injector for chafed wires, rodent damage, or breaks.

2. 2

   Unplug the connector at the cylinder 4 injector and check for water intrusion, corrosion, or pushed-back pins. Reconnect it to ensure it wasn't simply a loose connection.

3. 3

   Using a digital multimeter, measure the resistance (Ohms) across the two pins on the cylinder 4 injector itself. Compare this reading to the injectors on cylinders 1, 2, or 3. If cylinder 4 reads 'OL' (Open Loop/Infinite resistance) or is significantly out of specification compared to the others, the injector has failed internally.

4. 4

   If the injector tests good, disconnect the main harness at the Engine ECU and check for continuity on the two wires running from the ECU plug to the cylinder 4 injector plug.

1. 1

   Prep

   Disconnect the machine's battery to prevent electrical shorts. Thoroughly clean the area around the cylinder 4 injector to prevent dirt from falling into the cylinder or fuel system.

2. 2

   Remove Lines

   Loosen and remove the high-pressure fuel line connecting the fuel rail to the cylinder 4 injector. Note: Immediately cap the rail fitting and the injector inlet to prevent contamination.

3. 3

   Disconnect

   Unplug the electrical connector from the injector.

4. 4

   Extract

   Remove the injector hold-down clamp bolt and the clamp. Carefully pull the injector straight up and out of the cylinder head.

5. 5

   Clean & Inspect

   Ensure the old copper sealing washer came out with the injector. Clean the injector bore in the cylinder head.

6. 6

   Install

   Install the new injector. You must use a new copper crush washer and O-ring.

7. 7

   Reassemble

   Reinstall the hold-down clamp and torque the bolt to OEM specifications. Reinstall the high-pressure fuel line and torque the fittings. Reconnect the electrical plug.

8. 8

   Finalize

   Reconnect the battery. Bleed the fuel system if required by your specific engine manual.

9. 9

   ECU Programming

   Clear the fault codes using a diagnostic tool. Note: Depending on the exact engine generation (especially Tier 4 F5H engines), you may need to use a diagnostic tool to enter the new injector's IQA/Trim code (printed on the top of the new injector) into the Engine ECU so it can properly balance fuel delivery.