Case IH 3302 – Engine ECU (EDC - Electronic Diesel Control module): Cylinder 3 Specific Errors - Signal Not Plausible

This code indicates that the engine control module is receiving an irregular, out-of-range, or implausible electrical signal from the fuel injector circuit on cylinder number 3. This typically points to an electrical fault in the injector solenoid, a wiring harness issue, or a mechanical response failure of the injector itself.

• Case IH Magnum 235 - 340 (Series 4)
• Case IH Puma series
• Case IH Farmall series

1. 1

   Use the CNH EST or EASY diagnostic tool to verify if the code is active or stored, and check for secondary codes (such as rail pressure deviations).

2. 2

   Inspect the wiring harness running from the Engine ECU to the cylinder 3 fuel injector. Look for chafed wires, melted insulation, or loose/corroded connector pins.

3. 3

   Measure the electrical resistance of the cylinder 3 injector solenoid with a multimeter to determine if it has an internal short or open circuit.

4. 4

   Check the fuel rail pressure sensor readings and inspect the pressure relief valve. Fuel leaking from the relief valve can cause pressure drops that trigger secondary injector faults.

1. 1

   Disconnect Power

   Disconnect the machine's battery to prevent electrical shorts while working on the EDC system.

2. 2

   Access the Injector

   Locate the cylinder 3 fuel injector on the engine block.

3. 3

   Repair Wiring

   If the diagnostic checks revealed a damaged connector or wiring harness, splice in a new connector pigtail or repair the damaged wire.

4. 4

   Remove the Fuel Line

   If the injector itself is faulty, loosen and remove the high-pressure fuel injection line connected to cylinder 3.

5. 5

   Extract the Injector

   Remove the injection nozzle crab/clamp holding the injector in place (e.g., removing the 5/16 NC hex bolt). Carefully extract the injector from the cylinder head.

6. 6

   Install the New Injector

   Seat the new fuel injector using new O-rings and a new copper sealing washer.

7. 7

   Reassemble

   Reinstall the injector clamp and torque to OEM specifications. Reconnect the high-pressure fuel line and the electrical connector.

8. 8

   Clear Codes

   Reconnect the battery, bleed the fuel system of air, and use the diagnostic tool to clear fault code 3302. Run the engine to verify the repair.