New Holland NH 3063 – Engine ECU: Injector solenoid valve Cylinder 1 - NO SIGNAL

The engine control system is unable to communicate with or control the fuel injector on the first cylinder because the electrical signal is lost, typically due to the high-side wiring shorting out against the machine's chassis/ground or a severed connection.

• T4.75
• T4.85
• T4.95
• T4.105
• T4.115
• T5.95
• T5.105
• T5.115
• T5.100
• T5.110
• T5.120
• T6 Series
• T7 Series
• T8 Series
• T9 Series
• L180
• L185
• L223
• L230
• C185
• C332
• SR/SV series
• Workmaster
• CR/FR Harvesters

1. 1

   Trace the injector cable from the Engine ECU to the Cylinder 1 fuel injector. Look for chafed, pinched, or melted wire insulation that could cause the high-side wire to short against the engine block or ground.

2. 2

   Disconnect the plug at the Cylinder 1 injector and the ECU. Inspect the pins for corrosion, moisture, or pushed-out terminals that would cause a 'No Signal' reading.

3. 3

   Test the Cylinder 1 injector circuit for continuity using a multimeter. Test the high-side wire for continuity to ground (it should read open/infinite resistance; if there is continuity, you have found your short).

4. 4

   Measure the internal resistance of the Cylinder 1 injector solenoid to ensure the injector itself has not failed internally (causing an open circuit).

1. 1

   Disconnect Power

   Turn off the machine and disconnect the negative battery terminal to prevent ECU damage.

2. 2

   Expose Cylinder 1

   Remove any engine covers or valve covers necessary to access the Cylinder 1 fuel injector and its wiring harness.

3. 3

   Repair Wiring

   If the diagnostic multimeter tests reveal a short to ground in the harness, locate the damaged section of the wire. Splice and heat-shrink the damaged wire, or replace the injector wiring harness section entirely.

4. 4

   Replace Injector

   If the wiring tests perfectly but the injector solenoid fails its resistance test, the injector must be replaced. Remove the high-pressure fuel line (tube) connected to Cylinder 1. Remove the injector hold-down clamp/bolt. Extract the faulty injector and clean the injector bore. Install the new injector with a new copper sealing washer and O-rings. Reinstall the hold-down clamp and torque to OEM specifications. Reattach the high-pressure fuel line and the electrical connector.

5. 5

   Reassemble and Clear Codes

   Reconnect the battery, bleed the fuel system if necessary, and use a diagnostic tool to clear the NH 3063 fault code from the Engine ECU. Run the engine to verify the code does not return.