Case IH 3371 (F-519846-31) - ECU – Engine Control Unit (ECU): Info: Torque Limitation due to Fuel Quantity Limitation because of Injection System Errors.

This is an informational "derate" or symptom code rather than a root-cause component failure. It indicates that the engine control system has detected a malfunction somewhere in the fuel injection system. To protect the engine from damage or to comply with emissions regulations, the system intentionally limits the volume of fuel being injected, which results in a noticeable loss of power (strong torque limitation).

• VESTRUM CVX
• Case IH Magnum Tractors (e.g., 235 – 340 Series 4)
• Case IH Steiger Tractors
• Case IH Farmall Tractors (e.g., 115U)
• Case IH Axial-Flow Combines (e.g., 240 Series)

1. 1

   Scan for primary fault codes using the Case IH Electronic Service Tool (EST). Look for active or stored Engine ECU codes related to fuel rail pressure, fuel injectors, the high-pressure fuel pump, or fuel temperature.

2. 2

   Inspect the low-pressure fuel supply lines for restrictions, pinching, or air intrusion. Check the condition of the primary and secondary fuel filters.

3. 3

   Monitor the live data for the Fuel Rail Pressure Sensor and Fuel Metering Unit (M-PROP). Ensure the actual rail pressure matches the commanded rail pressure.

4. 4

   If primary codes indicate a loss of rail pressure, perform an injector return flow test to determine if a specific injector is leaking excessively back to the tank.

1. 1

   Identify the root cause

   Using the diagnostic tool, identify the primary injection system fault code that was logged at the exact same time as code 3371.

2. 2

   Perform targeted repair

   Repair or replace the component dictated by the primary fault code (e.g., replace a clogged fuel filter, swap a faulty fuel rail pressure sensor, or replace a leaking fuel injector).

3. 3

   Bleed the fuel system

   If the fuel system was opened during the repair, prime and bleed the air from the fuel lines according to the specific machine's service manual.

4. 4

   Clear codes

   Clear all inactive fault codes from the Engine ECU memory.

5. 5

   Test drive

   Perform an engine run cycle and operate the machine under load. Verify that full power is restored and that code 3371 (and the primary fault code) do not return.