CLAAS Id7765h / 7765h (655 05) – ENG (A15) - Engine Control Module: Open circuit on the electronic injector of cylinder n°5

The engine control module is detecting that the electrical current to the fuel injector on cylinder #5 is less than expected or completely interrupted. As a result, the engine will run with difficulty, idle roughly, and misfire because the injector in cylinder #5 is inoperative.

• Axion 850
• Axion 800
• Arion 640-510
• Arion 630-610 C

1. 1

   Verify that the Engine Module ENG (A15) is securely connected and that the pins on the ECU harness are not bent, corroded, or pushed out.

2. 2

   Inspect the electrical connector directly on the cylinder #5 fuel injector (Y320-5).

3. 3

   Use a multimeter to test the wiring harness between the ENG (A15) module and the cylinder #5 injector for an open circuit, chafing, or a broken wire.

4. 4

   Measure the internal resistance of the cylinder #5 injector coil to determine if the open circuit is internal to the injector itself.

1. 1

   Safety First

   Turn off the engine, remove the key, and disconnect the battery to prevent electrical shorts while working on the engine harness.

2. 2

   Locate Cylinder #5

   Identify the #5 cylinder on the engine block and locate its electronic fuel injector (Y320-5).

3. 3

   Inspect and Clean Connections

   Disconnect the injector plug. Clean the contacts with electrical contact cleaner. Reconnect and ensure it clicks into place. (If the issue was just a loose connector, this may resolve the fault).

4. 4

   Test the Circuit

   If the connector is secure, test the harness continuity back to the Engine ECU. Repair any broken wires in the harness.

5. 5

   Replace the Injector

   If the wiring harness tests good but the injector coil is internally open (infinite resistance), the injector must be replaced. Depressurize the fuel system, remove the high-pressure fuel lines to the injector, unbolt the injector hold-down clamp, and extract the injector.

6. 6

   Install New Parts

   Install the new injector with new O-rings and seals. Reinstall the injector tube/fuel lines and torque to OEM specifications.

7. 7

   Clear Codes

   Reconnect the battery, use a diagnostic tool to clear the Id7765h / 655 05 fault code, and prime the fuel system.

8. 8

   Test Run

   Start the engine and verify that the misfire is gone and the code does not return.