New Holland ENG 3068 – Engine Control Module (ECM) / Electronic Diesel Control (EDC): Cylinder 3 - Unclassifiable Error in Injector

The control module has detected an abnormal condition or implausible signal from the fuel injector solenoid on cylinder number 3. It is a specific error that does not fall into standard open-circuit or short-circuit categories.

• T7 Series
• T8.275
• T8.300
• T8.320
• T8.330
• T8.350
• T8.360
• T8.380
• T8.390
• T8.410
• T8.435
• T9.390
• T9.435
• CR7090
• CR9090
• CX8080 Elevation
• CX8090 Elevation Tier 4A
• Magnum 235–340 (Series 4)

1. 1

   Check for related fault codes (3069, 3070, or 3071) which point directly to a wiring harness issue rather than a mechanical injector failure

2. 2

   Inspect the wiring harness cables running from the Engine ECM to the cylinder 3 injector for chafing, breaks, or loose connections

3. 3

   Test the resistance of the cylinder 3 injector solenoid to see if it is out of specification or shorting internally

1. 1

   Disconnect the battery

   Disconnect the battery before beginning any service work on the engine or fuel system.

2. 2

   Clean the area

   Clean the area around the electronic unit injector and the cylinder to prevent loose material or debris from entering the engine.

3. 3

   Disconnect the electrical harness

   Disconnect the electrical harness from the cylinder 3 injector.

4. 4

   Remove components

   Remove the high-pressure fuel line and the injector hold-down components.

5. 5

   Extract the faulty injector

   Extract the faulty injector from the cylinder head.

6. 6

   Clean the carbon

   Clean the carbon from the seat area inside the electronic unit injector sleeve using the appropriate OEM tooling.

7. 7

   Install new O-ring seals

   Install new O-ring seals on the replacement electronic unit injector. Lubricate the top two O-ring seals with a 50/50 mixture of clean engine oil and the specified OEM lubricant.

8. 8

   Insert the new injector

   Insert the new injector into the cylinder sleeve, taking care not to damage the internal seal lips.

9. 9

   Reinstall components

   Reinstall the hold-down components and high-pressure fuel lines, torquing all fittings to OEM specifications.

10. 10

    Reconnect and clear codes

    Reconnect the electrical harness and battery, then clear the fault codes from the ECM.