Case IH 3299 – Engine Control Module (ECM) / EDC / EDC7: Cylinder 3 Specific Errors - No Signal

The engine control module is not detecting an electrical signal or current draw from the cylinder 3 fuel injector solenoid. The underlying condition is typically an open circuit, a disconnected or damaged wiring harness, or a completely failed internal solenoid coil inside the cylinder 3 fuel injector.

• Magnum 235
• Magnum 250
• Magnum 260
• Magnum 280
• Magnum 290
• Magnum 310
• Magnum 315
• Magnum 340
• Magnum 370
• Magnum 380
• Steiger 350
• Steiger 370
• Quadtrac 370
• Puma series
• Axial-Flow 6130
• Axial-Flow 7130
• Axial-Flow 7230
• Axial-Flow 8230
• Axial-Flow 9230

1. 1

   Inspect the wiring harness between the Engine ECU and the cylinder 3 fuel injector for chafing, breaks, or heat damage

2. 2

   Check the electrical connector at the cylinder 3 injector and the ECU pins to ensure they are clean, tight, and free of corrosion or pushed-out pins

3. 3

   Test the cylinder 3 injector coil using a digital multimeter to measure resistance across the terminals. An infinite resistance (OL) reading indicates an open internal solenoid coil

4. 4

   Check for short circuits to ground or to the battery on the injector circuit, which can masquerade as a signal loss if the ECU cuts power to protect the circuit

1. 1

   Disconnect Power

   Disconnect the machine's battery to prevent electrical shorts during the repair.

2. 2

   Gain Access

   Remove the engine valve cover or necessary access panels to reach the cylinder 3 fuel injector.

3. 3

   Disconnect Wiring

   Unplug the electrical connector from the cylinder 3 injector.

4. 4

   Harness Repair (If Applicable)

   If the diagnostic tests proved the wiring harness is faulty, repair the broken wire or replace the injector harness section.

5. 5

   Remove the Injector

   If the injector coil failed, remove the high-pressure fuel line connected to cylinder 3 and remove the injector hold-down clamp.

6. 6

   Clean and Prep

   Extract the faulty cylinder 3 injector. Thoroughly clean the injector bore and seat in the cylinder head, ensuring no debris falls into the cylinder.

7. 7

   Install New Injector

   Install the new fuel injector using a new copper sealing washer and new O-rings. Torque the hold-down clamp and high-pressure fuel lines to exact OEM specifications.

8. 8

   Reconnect

   Reconnect the electrical harness to the injector and reinstall the valve cover.

9. 9

   ECU Programming (Crucial)

   Connect a diagnostic scan tool (such as the CNH EST tool) and program the new injector's IMA (Injector Adjustment) calibration code into the Engine ECU. Note: Failure to program the IMA code will result in rough running and will trigger secondary fault codes (e.g., 3907 - IMA programming not correct for injector cylinder 3).

10. 10

    Final Test

    Reconnect the battery, prime/bleed the fuel system, clear the inactive fault codes, and test run the engine to verify the repair.