New Holland 3069 – ECM: Injector Solenoid Valve Cylinder 3 - SOURCE HIGH

The Engine Control Module (ECM) has detected an abnormally high voltage on the electrical circuit for the fuel injector on cylinder 3. This typically indicates a 'short to battery' on the low side (control wire) of the circuit, meaning the control wire is likely making contact with a power source. This high signal disrupts the communication sent to the component, causing the injector to malfunction and leading to symptoms such as engine misfire, rough running, and excessive smoke.

• T8.275
• T8.300
• T8.330
• T8.360
• T8.390
• T8.420
• Magnum 235
• Magnum 260
• Magnum 290
• Magnum 315
• Magnum 340

1. 1

   Visually inspect the wiring harness between the ECM and the cylinder 3 fuel injector for chafing, melting, pinched wires, or corrosion.

2. 2

   Disconnect and inspect the pins and terminals on both the cylinder 3 injector connector and the main ECM connector for corrosion, moisture intrusion, or damage.

3. 3

   Check for a short to power by measuring voltage on the control wire with the key ON (engine off); it should read close to 0 volts, not battery voltage.

4. 4

   Perform an injector solenoid resistance test across the two terminals of the cylinder 3 injector and compare to specifications or an adjacent functioning injector.

5. 5

   Perform a harness integrity test with the key OFF to check for continuity (less than 1 ohm) and ensure there are no shorts to ground or power (should read OL).

1. 1

   Confirm the fault

   Based on diagnostic checks, determine whether the root cause lies with the injector solenoid, the wiring harness, or the ECM.

2. 2

   Repair wiring harness

   If a short circuit or open wire is found, repair the damaged section using approved splicing techniques and heat-shrink tubing, or replace the harness section if damage is extensive.

3. 3

   Replace the fuel injector

   If the injector solenoid is faulty, clean the area, remove the hold-down clamp and fuel lines, and extract the injector and copper washer. Install the new injector with a new copper washer and lubricated O-rings. Torque the hold-down clamp to 9 Nm and the fuel tube nut to 50 Nm (plus angle turn per manual).

4. 4

   Program new injector

   Enter the unique calibration code (QR or IQA code) printed on the new injector into the ECM using the New Holland Electronic Service Tool (EST) software to ensure proper engine balance.

5. 5

   Clear codes and verify

   Reconnect the battery, clear the fault codes using the EST, start the engine, and operate the machine to verify the fault does not return.