Case IH 17873 (F-653-03) - ECU – Engine ECU (Electronic Control Unit): Short circuit error of injector in cylinder 3

The control module has detected an electrical short circuit (either to ground or to a voltage source) in the wiring or the internal solenoid of the fuel injector located at cylinder number 3.

• VESTRUM CVX
• Austoft 9000
• Austoft 9900
• A8000
• A8800
• Axial-Flow 7240
• Axial-Flow 8240
• Axial-Flow 9240
• Axial-Flow 7120
• Axial-Flow 8010
• Steiger
• Quadtrac
• Magnum
• Puma
• Maxxum
• Patriot
• Axial-Flow 7250
• Magnum 370
• Axial-Flow 6140

1. 1

   Check for accompanying injector short circuit codes (e.g., 3063/DTC 6226 for cylinder 1, or 3071/DTC 6626 for cylinder 2) to rule out a shared wiring harness failure or a bank short.

2. 2

   Visually inspect the engine wire harness leading to the cylinder 3 fuel injector for chafed insulation, pinched wires, or melted connectors.

3. 3

   Disconnect the cylinder 3 injector and use a multimeter to test the harness for continuity and short-to-ground.

4. 4

   Measure the resistance across the cylinder 3 injector's terminals to determine if the internal solenoid is shorted.

1. 1

   Power Down

   Turn off the machine, allow the engine to cool, and disconnect the battery to prevent electrical arcing or ECU damage.

2. 2

   Isolate the Fault

   Based on the diagnostic checks, determine if the short is in the wiring harness or the injector itself.

3. 3

   Harness Repair (If Applicable)

   If a short circuit is indicated in the wiring, repair the damaged section of the wire harness or replace the harness assembly as required by OEM guidelines.

4. 4

   Injector Replacement (If Applicable)

   If the injector is internally shorted: Clean the area around cylinder 3, remove the high-pressure fuel line, remove the hold-down clamp/bolt, and carefully extract the faulty injector. Clean the injector bore thoroughly, install the new injector ensuring a new copper sealing washer and new O-rings are used, reinstall the hold-down clamp and high-pressure fuel line, and torque all fittings to OEM specifications.

5. 5

   Reassembly and Clearing Codes

   Reconnect the electrical connector to the injector and reconnect the battery. Connect a diagnostic tool to the machine, erase the fault code 17873 (F-653-03) from the ECU memory, and run the engine to verify the repair.