Case IH F-654-05 - ECU – Engine Control Unit (ECU) / ECU A-095: Open load error of injector in cylinder 4 / Injector Cylinder #4 Needle Control Valve Circuit Open

The engine controller has detected that the electrical current in the cylinder 4 fuel injector circuit is below normal, indicating an open circuit, a poor connection, or a failed injector solenoid coil.

• MAGNUM AFS Connect
• Austoft 9900 sugarcane harvesters
• 240 Series Axial-Flow Combines
• Magnum MX/TG Series Tractors
• Steiger Tractors
• Patriot Sprayers

1. 1

   Check for other active codes (such as a general short-circuit on the injection cable bank 1) and address those first

2. 2

   Verify the tractor's battery power supply has not been connected to an external power supply; if it has, disconnect it and test for normal operation

3. 3

   Inspect the engine wiring harness and injector connectors for physical damage, oil contamination, or DEF crystallization (using a UV blacklight)

4. 4

   Check the injector circuit resistance at the ECU, then remove the valve cover and check resistance directly at the cylinder 4 injector connector (Y-064) to isolate harness vs. injector issues

5. 5

   Perform an injector continuity test by disconnecting the harness at Y-064 and checking for continuity from pin 1 to chassis ground (there should be NO continuity)

6. 6

   Perform an injector cut-out test using diagnostic software or physically swap the injector with another cylinder to verify if the fault follows the injector

1. 1

   Harness Repair

   If the diagnostic checks isolate the issue to the wiring, repair or replace the damaged section of the engine wiring harness/injector pigtail. Recheck the function after the harness is repaired.

2. 2

   Injector Replacement

   If the injector fails the continuity test (shows continuity to ground) or the fault follows the injector when swapped, the injector must be replaced.

3. 3

   Reassembly

   Reconnect the injector harness (Y-064) and reinstall the valve cover.

4. 4

   Clear Codes and Test

   Use the diagnostic tool to clear the inactive fault codes. Bring the engine to operating temperature and road test/run the machine at idle to verify the repair and ensure the code does not return.