New Holland 3071 – ECU: Cylinder 3 Injector Circuit - Short Circuit Engine

The Engine Control Unit (ECU) has detected that the high-side driver wire for the cylinder 3 fuel injector is electrically shorted to a ground source. This condition disrupts the precise electrical signals required for proper injector operation, which can lead to engine performance issues such as rough running, misfires, or a failure to start.

• T4.90
• T4.100
• T4.110
• T4.120
• T5.90
• T5.100
• T5.110
• T5.120
• T8
• POWERSTAR 90
• POWERSTAR 100
• POWERSTAR 110
• POWERSTAR 120
• WORKMASTER 95
• WORKMASTER 105
• WORKMASTER 120
• B110C
• B110D
• B95C
• B95CLR
• B95CTC
• B95D
• L230
• L234
• C234
• C238
• C245
• C334
• C345
• C362

1. 1

   Visually inspect the wiring harness leading to the cylinder 3 fuel injector for chafing, melting, pinched wires, or corrosion on the connector pins.

2. 2

   Ensure the electrical connectors at the injector and at the ECU are securely fastened. Disconnect and reconnect them to ensure a solid connection.

3. 3

   Verify that the battery voltage is stable (typically above 12.1V) and check that the main chassis and engine ground connections are clean, tight, and free of corrosion.

4. 4

   Perform an injector resistance test by disconnecting the harness and measuring ohms across the injector pins. Compare to a known good injector; a near-zero reading indicates a faulty, shorted injector coil.

5. 5

   Perform a wiring harness continuity and short-to-ground test with the injector and ECU disconnected. Check for continuity on both wires, and ensure there is no continuity between either wire and a known good chassis ground.

6. 6

   Use the New Holland Electronic Service Tool (EST) to perform an Injector Cutout Test to confirm the cylinder is failing to contribute power.

1. 1

   Disconnect battery

   Disconnect the battery ground cable before beginning any electrical repairs to prevent accidental shorts.

2. 2

   Access the injector

   Remove engine covers, intake manifolds, or other components as necessary to gain access to the cylinder 3 fuel injector and its wiring.

3. 3

   Repair wiring harness

   If the wiring was found to be shorted to ground, repair the damaged section of the harness. If the damage is severe or near a connector, replace the relevant section of the engine harness. Ensure all repairs are sealed against moisture and vibration.

4. 4

   Replace fuel injector

   If the injector coil failed the resistance test, replace the cylinder 3 fuel injector. Replace the copper sealing washer at the base of the injector and any associated O-rings to ensure a proper seal.

5. 5

   Reassemble components

   Reassemble all components that were removed for access. Ensure all connectors are securely fastened.

6. 6

   Clear codes and verify

   Reconnect the battery. Use the New Holland EST to clear the 3071 fault code. Start the engine and check for misfires. If a new injector was installed, program its QR code to the ECU using the EST to ensure balanced engine operation.