New Holland ENG 3067 – Engine Control Unit (ECU): Cylinder5 - Injector Cable Short circuit (High Side to Ground)

The engine control module has detected a short circuit to ground on the high-voltage supply side of the wiring circuit for the cylinder 5 fuel injector. When this fault is active, the system will shut down the cylinder 5 injector to protect the circuit, resulting in a noticeable engine misfire and loss of power.

• T6 series (T6.140, T6.175)
• T7 series (T7.170, T7.210, T7.230)
• T8 series
• T6000 series
• T7000 series
• CR series (CR9090)
• CX series (CX8080, CX8090)
• Magnum (235-340 series)
• Puma
• Maxxum

1. 1

   Verify the misfire: Confirm the engine is misfiring on cylinder 5, as the ECU will intentionally disable this injector.

2. 2

   Visual wiring inspection: Inspect the engine wiring harness running from the Engine ECU to the cylinder 5 injector for chafing, melted insulation, or pinched wires grounding against the block or valve cover.

3. 3

   Continuity/Resistance testing: Disconnect the wiring harness at the ECU and cylinder 5 injector. Use a multimeter to test the high-side wire of the injector circuit for continuity to ground. Continuity indicates a shorted harness.

4. 4

   Injector solenoid testing: If the wiring harness tests good, check the resistance across the injector pins and test for an internal short from the injector pins to the injector body/ground.

5. 5

   Oscilloscope testing (Optional): Use a tool like a PicoScope with a current clamp to monitor the injector circuit for induced noise from companion cylinders.

1. 1

   Disconnect power

   Turn off the machine and disconnect the negative battery cable to prevent electrical damage.

2. 2

   Access components

   Remove any engine covers or cowlings necessary to access the engine ECU and the fuel rail/injectors.

3. 3

   Address wiring issues

   If diagnostic checks revealed a short to ground in the wiring harness, repair the damaged section of the wire using proper soldering and heat-shrink techniques, or replace the engine wiring harness entirely if the damage is extensive.

4. 4

   Replace the injector

   If the wiring harness is intact and the short is internal to the injector: Clean the area around the cylinder 5 injector. Remove the high-pressure fuel line and the hold-down clamp. Extract the faulty injector and install the new one with new O-rings and copper sealing washers. Torque the hold-down clamp and fuel lines to OEM specifications.

5. 5

   Reassemble and clear codes

   Reconnect all electrical connectors and the battery. Use a diagnostic scan tool or DTC eraser to clear the ENG 3067 fault code from the Engine ECU.

6. 6

   Test run

   Start the engine, check for fuel leaks, and verify that the misfire is gone and the fault code does not return.