Case IH 3371 (DTC F3EF) - ECU – Engine Control Unit (ECU): Strong torque limitation from injection system active

Informational fault code indicating that the engine has entered a protective derate mode to protect the high-pressure fuel pump from excessively high temperatures. This occurs if the system forces a power reduction greater than 15.00% or an engine speed limitation greater than 5.00% for more than 120 seconds.

• MAXXUM T4E
• 240 Series Axial-Flow Combines
• Magnum 235-340 (Series 4)
• Steiger 350-600 hp
• Puma series
• Farmall models

1. 1

   Check if the tractor's battery power supply has been connected to an external power supply (e.g., a jump box or external charger).

2. 2

   Check for actual high fuel temperatures and ensure there are no restrictions in the fuel lines, fuel filters, or water separators.

3. 3

   Monitor the fuel temperature sensor readings via a diagnostic tool to ensure it is not falsely reporting an overheat condition.

1. 1

   Disconnect External Power

   If an external power source is connected to the battery, remove it immediately.

2. 2

   Cool Down Period

   Allow the machine to idle or shut it down to let the high-pressure fuel pump and fuel system cool to normal operating temperatures.

3. 3

   Clear the Code

   Since this is an informational code, it may clear once temperatures return to normal. If the system is locked, it may require a reset using the dealer service tool (EST).

4. 4

   Address Root Causes (If code returns)

   Replace clogged fuel filters/water separators to ensure proper fuel flow to the high-pressure pump. If the fuel temperature sensor is reading erratically, replace the sensor. If the high-pressure fuel pump is physically overheating due to internal wear or returning too much fuel, the pump itself will need to be replaced.