Case IH 19487 – Engine Control Module (ECM / ECU): Fuel quantity Balancing Control correction quantities at limitation for injector in cylinder 1

The ECU has to adjust the fuel quantity for the cylinder 1 fuel injector beyond its programmed maximum or minimum allowable limits. This indicates that cylinder 1 is either underperforming or overperforming drastically, which usually points to a failing fuel injector, a wiring issue, or a mechanical loss of compression in that specific cylinder.

• Tier 4b
• 580N
• 580SN
• 590SN
• 590SM
• Maxxum
• Farmall
• Steiger
• Magnum
• Axial-Flow 7010
• Axial-Flow 8010
• Axial-Flow 9120

1. 1

   Check for accompanying active ECU codes related to injector circuits (open/short circuits) or fuel rail pressure.

2. 2

   Inspect the wiring harness and connectors leading to the cylinder 1 injector for chafing, corrosion, or loose pins at both the injector and ECU.

3. 3

   Perform a mechanical compression test or an electronic cylinder contribution test to check for low compression (e.g., bad piston rings or valves) which can force the ECU to max out fuel trim.

4. 4

   Swap the cylinder 1 injector with the cylinder 2 injector. If the fault code changes to cylinder 2 (Code 19490), the injector is faulty. If it remains on cylinder 1, the issue is mechanical or wiring-related.

1. 1

   Preparation

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

2. 2

   Relieve Pressure

   Ensure the high-pressure fuel system is depressurized before opening any lines.

3. 3

   Access the Injector

   Depending on the engine model, remove the valve cover (if injectors are internal) or access the fuel rail directly.

4. 4

   Remove Lines

   Disconnect the electrical connector and remove the high-pressure fuel line connected to the cylinder 1 injector. Cap the fuel rail port to prevent contamination.

5. 5

   Extract Injector

   Remove the injector hold-down clamp/bolt. Carefully extract the injector from the cylinder head.

6. 6

   Clean the Bore

   Thoroughly clean the injector bore and ensure the old copper sealing washer is removed from the bottom of the hole.

7. 7

   Installation

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

8. 8

   Reassembly

   Reinstall the hold-down clamp and torque the bolt to the exact OEM specification. Reconnect the high-pressure fuel line and electrical connector.

9. 9

   ECU Programming

   Using a diagnostic service tool, enter the new injector's IQA/Trim code (printed on the top of the new injector) into the Engine ECU so it can properly calibrate fuel delivery.

10. 10

    Test

    Reconnect the battery, prime the fuel system, start the engine, and verify that the fault code does not return.