Case IH 3291 – Engine Control Module (ECM) / EDC: Cylinder 1 Specific Errors - No Signal

The engine control module is not receiving a valid electrical signal from the Cylinder 1 fuel injector solenoid valve. This typically points to an open circuit, a disconnected plug, a severed wire, or a complete internal failure of the injector's electrical solenoid.

• Magnum 215
• Magnum 235
• Magnum 245
• Magnum 255
• Magnum 275
• Magnum 305
• Magnum 310
• Magnum 335
• Magnum 340
• Magnum MX
• Magnum Series 4
• Steiger Series
• Quadtrac Series
• Puma Series
• Combine 1660
• Combine 2166
• Combine 2388

1. 1

   Inspect the wiring harness leading to the Cylinder 1 fuel injector for chafed wires, melted insulation, or disconnected plugs.

2. 2

   Disconnect the Cylinder 1 injector harness and check the pins for corrosion, pushed-back terminals, or moisture.

3. 3

   Using a multimeter, check the resistance across the Cylinder 1 injector solenoid pins (an open circuit or infinite resistance confirms a dead injector solenoid).

4. 4

   Check the continuity of the wiring from the injector connector back to the ECM pins (e.g., Pins 16 and 32) to ensure there is no break in the harness.

1. 1

   Preparation

   Disconnect the tractor's battery to prevent electrical shorts. Clean the area around the valve cover and fuel rail to prevent dirt from entering the engine.

2. 2

   Access the Injector

   Remove the engine covers and, if necessary, the valve cover to access the Cylinder 1 fuel injector.

3. 3

   Disconnect Lines

   Disconnect the electrical connector from the Cylinder 1 injector. Carefully loosen and remove the high-pressure fuel line connecting the common rail to the injector. Note: Cap the rail and injector ports immediately to prevent contamination.

4. 4

   Remove the Injector

   Remove the injector hold-down clamp or fastening screws. Carefully extract the injector from the cylinder head.

5. 5

   Clean the Bore

   Thoroughly clean the injector bore in the cylinder head, ensuring no old copper washers or debris are left behind.

6. 6

   Install New Injector

   Place a new copper sealing washer (grommet) on the new injector. Insert the injector into the bore.

7. 7

   Reassembly

   Reinstall the hold-down clamp and torque the fastening screws to the manufacturer's specified torque setting. Reconnect the high-pressure fuel line and torque to spec.

8. 8

   Reconnect

   Plug in the electrical connector and reconnect the battery.

9. 9

   Calibration

   For modern common-rail engines, use the Case IH Electronic Service Tool (EST) to enter the new injector's IMA (Injector Menge Abgleichung / Injector Quantity Adjustment) code into the ECM. This code is stamped on the top of the new injector.

10. 10

    Test

    Prime the fuel system, start the engine, check for leaks, and use the diagnostic tool to clear fault code 3291.