New Holland NH 3079 – EDC7: Injector solenoid valve Cylinder 2 - NO SIGNAL

The engine control module is failing to detect the expected electrical feedback from the fuel injector on the second cylinder, preventing the injector from firing properly.

• New Holland T5 Series
• New Holland T5.95
• New Holland T5.105
• New Holland T5.115
• New Holland T7 Series
• New Holland T8 Series
• New Holland T8.295
• New Holland T8.325
• New Holland T8.355
• New Holland T8.385
• New Holland T9 Series

1. 1

   Inspect the wiring harness leading to the Cylinder 2 injector for visible chafing, melting, or breaks (potential short to ground on the high side).

2. 2

   Disconnect the connector at the Cylinder 2 injector and at the EDC7 ECU. Check for water ingress, corrosion, backed-out pins, or damaged terminals.

3. 3

   Using a digital multimeter, check the injector cable for continuity from the ECU pin to the injector connector. Test the high-side wire for a short circuit to ground (chassis) or a short to battery voltage.

4. 4

   Measure the resistance across the terminals of the Cylinder 2 injector solenoid. Compare the reading to a known good injector or the OEM specification to determine if the solenoid is internally open or shorted.

1. 1

   Safety First

   Turn off the machine, remove the key, and disconnect the negative battery cable to prevent electrical arcing.

2. 2

   Access the Injector

   Remove the engine covers or valve covers necessary to access the fuel injectors and the engine wiring harness.

3. 3

   Harness Repair (If Applicable)

   If the diagnostic tests revealed a short to ground or a broken wire in the harness, repair the damaged section using weather-sealed connectors, or replace the entire injector wiring harness if the damage is extensive.

4. 4

   Injector Replacement (If Faulty)

   Clean the area around the Cylinder 2 injector thoroughly to prevent debris from entering the engine block. Disconnect the high-pressure fuel line (injector pipe) for Cylinder 2. Remove the injector hold-down clamp/bolt. Carefully extract the faulty injector. Install the new injector with new O-rings and copper sealing washers. Torque the hold-down bolt to OEM specifications. Install the high-pressure fuel line and torque to spec.

5. 5

   Reassembly

   Reconnect the electrical connector to the injector. Reinstall any removed covers.

6. 6

   System Bleed & Test

   Reconnect the battery. Bleed the fuel system if required by the specific engine manual. Use a diagnostic scan tool to clear the NH 3079 fault code. Start the engine and verify smooth operation without the code returning.