Case IH 3310 – Engine Control Unit (ECU) / EDC (Electronic Diesel Control): Cylinder 5 Specific Errors - Signal Not Plausible

The engine controller is receiving an irregular, out-of-range, or illogical electrical signal from the fuel injector on cylinder number 5. This typically points to an electrical failure within the injector's internal solenoid, a wiring harness issue (such as a short, open circuit, or high resistance), or a poor connection at the injector plug.

• Case IH Magnum 180
• Case IH Magnum 215
• Case IH Magnum 235
• Case IH Magnum 245
• Case IH Magnum 260
• Case IH Magnum 275
• Case IH Magnum 290
• Case IH Magnum 305
• Case IH Magnum 315
• Case IH Magnum 335
• Case IH Magnum 340 (Series 4)
• Case IH Steiger Series
• Case IH Puma Series
• Case IH Patriot Sprayer SPX3310
• Case IH Patriot Sprayer SPX3150
• Case IH Patriot Sprayer SPX3185
• Case IH Patriot Sprayer SPX3200

1. 1

   Scan for Related Codes: Use the CNH EASy diagnostic tool to retrieve the DTCs. Check if there are accompanying codes for rail pressure drops or other cylinder faults (e.g., 3309, 3311) which might indicate a broader fuel rail issue rather than an isolated injector failure.

2. 2

   Wiring Harness Inspection: Visually inspect the wiring harness and connectors between the Engine ECU and the Cylinder 5 injector. Look for chafing, melted wires, corrosion, or loose pins.

3. 3

   Solenoid Resistance Test: Disconnect the plug at the Cylinder 5 injector and use a multimeter to measure the resistance (ohms) across the injector terminals. Compare the reading to OEM specifications to determine if the injector solenoid is internally shorted or open.

4. 4

   Cylinder Contribution Test: If the engine runs, perform an injector kill test via the diagnostic tool to confirm that Cylinder 5 is the dead or underperforming cylinder.

1. 1

   Safety First

   Turn off the ignition and disconnect the machine's battery to prevent electrical shorts and ensure the ECU is powered down.

2. 2

   Gain Access

   Remove the engine valve cover or necessary access panels to reach the fuel injectors.

3. 3

   Disconnect Electricals

   Carefully unplug the electrical connector from the Cylinder 5 fuel injector.

4. 4

   Remove Fuel Lines

   Disconnect the high-pressure fuel injection line from the injector. Cap the fuel rail and the line immediately to prevent dirt or debris from contaminating the fuel system.

5. 5

   Extract the Injector

   Remove the injector hold-down clamp or bolt. Carefully pull the Cylinder 5 fuel injector out of the cylinder head.

6. 6

   Clean and Prep

   Clean the injector bore thoroughly. Ensure the old sealing washer is removed and no debris falls into the combustion chamber.

7. 7

   Install New Injector

   Place a new sealing washer/O-ring on the replacement injector. Insert the new injector into the bore and torque the hold-down clamp to the exact OEM specification.

8. 8

   Reassemble

   Reconnect the high-pressure fuel line and torque it to spec. Reconnect the electrical plug to the injector.

9. 9

   Close Up

   Reinstall the valve cover and any removed panels. Reconnect the battery.

10. 10

    ECU Reset & Calibration

    Use the CNH diagnostic scanner to clear the stored 3310 fault code. If installing a new common rail injector, you may need to program the new injector's trim code/IQA code into the ECU so it can adjust the fueling properly.

11. 11

    Test

    Start the engine, check for fuel leaks, and verify smooth operation.