New Holland ENG 3298 – Engine Control Unit (ECU) / EDC (Electronic Diesel Control): Cylinder 2 Specific Errors - Signal Not Plausible

The engine control module is receiving an irregular, out-of-range, or illogical electrical signal from the fuel injector on Cylinder 2. It typically points to a failure in the injector's electrical solenoid, a break/short in the wiring harness, or a mechanical response failure within the injector itself.

• T6 Series
• T8.xxx Series
• Magnum 235 - 340 (Series 4)
• W170 B Tier 3 Wheel Loader
• W190 B Tier 3 Wheel Loader

1. 1

   Inspect the wiring harness connecting the EDC to the Cylinder 2 fuel injector for chafing, heat damage, or bare wires shorting against the engine block

2. 2

   Disconnect the Cylinder 2 injector connector and check for corrosion, moisture, or bent pins

3. 3

   Use a multimeter to test the resistance and continuity of the wiring harness from the injector plug back to the EDC pins

4. 4

   Measure the resistance across the terminals of the Cylinder 2 injector to see if the internal solenoid is open or shorted out of OEM specification

5. 5

   Look for accompanying rail pressure codes (e.g., 3297: Cylinder 2 injector mechanical response fault). If present, the injector is likely failing mechanically and bypassing fuel

1. 1

   Prep the Machine

   Turn off the engine, remove the key, and disconnect the battery to prevent electrical shorts.

2. 2

   Access the Injector

   Remove the engine hood, valve cover, or any upper engine components required to access the Cylinder 2 fuel injector.

3. 3

   Wiring Repair (If Applicable)

   If the diagnostic checks revealed a wiring fault, repair the broken wire or replace the injector wiring harness pigtail. If the wiring is intact, proceed to replace the injector.

4. 4

   Remove Fuel Lines

   Carefully loosen and remove the high-pressure fuel line connected to the Cylinder 2 injector. Cap the fuel rail port and the line to prevent dirt from entering the fuel system.

5. 5

   Extract the Injector

   Remove the injector hold-down clamp/bolt. Carefully extract the Cylinder 2 fuel injector from the cylinder head.

6. 6

   Install New Injector

   Clean the injector bore. Install the new FPT fuel injector, ensuring a new copper sealing washer and O-rings are used.

7. 7

   Reassembly

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

8. 8

   System Bleed & Calibration

   Reconnect the battery. Bleed the fuel system if required by the specific engine manual. Use the CNH Electronic Service Tool (EASY/EST) to clear the fault codes and, if required by the specific EDC generation, program the new injector's trim code (IQA code) into the ECU.

9. 9

   Test

   Start the engine, check for fuel leaks, and verify that code ENG 3298 does not return.