New Holland ENG 3302 – Engine ECU (Bosch EDC7 / EDC7UC31): Cylinder 3 Specific Errors - Signal Not Plausible

The Engine Control Unit is receiving an erratic, intermittent, or incorrect electrical signal from the fuel injector solenoid on cylinder 3. The system is detecting an electrical anomaly in the injector circuit, which could be caused by an open load, a short circuit to the battery (low side), a short circuit to ground (high side), or an internal failure of the injector solenoid valve itself.

• New Holland T8.xxx Series
• New Holland T5.95
• New Holland T5.105
• New Holland T5.115
• New Holland T6000 Series (T6010, T6070)
• New Holland CR9090
• New Holland CX8080 Elevation
• New Holland CX8090 Elevation Tier 4A Combines

1. 1

   Visual Inspection: Check the wiring harness and electrical connector leading to the Cylinder 3 fuel injector for chafing, corrosion, or loose connections.

2. 2

   Circuit Testing: Test the Cylinder 3 injector cable for a short-circuit low side to the battery, a short-circuit high side to ground, or an open load.

3. 3

   Component Testing: Measure the resistance of the Cylinder 3 injector solenoid to verify it is within OEM specifications.

4. 4

   ECU Pin Inspection: Inspect the pins on the Bosch EDC7 Engine ECU connector (16-way, 36-way, or 89-way connectors) for bent pins, damage, or moisture intrusion.

5. 5

   Cylinder Balancing: Perform an adaptive cylinder balancing test via a diagnostic tool to check the mechanical response and source voltage of Cylinder 3.

1. 1

   Disconnect battery

   Disconnect the cable from the negative (-) terminal of the battery.

2. 2

   Remove covers

   Remove the engine hood assembly and any necessary covers to access the fuel injection system.

3. 3

   Disconnect electrical connector

   Locate the Cylinder 3 fuel injector. Carefully insert a screwdriver into the clearance of the electrical connector and pry off the connector gradually to avoid breaking the retaining clips.

4. 4

   Repair wiring

   If the diagnostic tests revealed a wiring issue, repair the damaged section of the harness or splice in a new EDC7 injector repair pigtail/loom.

5. 5

   Clean injector area

   If the injector itself is faulty, clean the area around the injector to prevent debris from entering the cylinder.

6. 6

   Remove fuel line

   Remove the high-pressure fuel line connected to the Cylinder 3 injector.

7. 7

   Remove hold-down clamp

   Remove the injector hold-down clamp/bracket.

8. 8

   Extract fuel injector

   Use an appropriate injector puller tool (if seized) to extract the Cylinder 3 fuel injector from the cylinder head.

9. 9

   Install new injector

   Install the new fuel injector, ensuring that a new copper sealing washer/wire is used at the base.

10. 10

    Reinstall hold-down clamp

    Reinstall the hold-down clamp and torque to OEM specifications.

11. 11

    Reconnect components

    Reconnect the high-pressure fuel line and the electrical connector.

12. 12

    Finalize repair

    Reconnect the negative battery terminal, bleed the fuel system if required by the specific engine manual, and use a diagnostic tool to clear the ENG 3302 fault code. Run the engine to verify the repair.