Case IH F-3607-14 - ECU – Engine Control Unit (ECU): ECU internal failure - Engine speed limitation via fuel injection cut off is active.

Informational code (Level 2 monitoring) indicating that the engine control system has actively intervened to limit the engine speed to a controllable range by cutting off fuel injection. This is a protective derate measure triggered by a different primary fault.

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1. 1

   Do not immediately assume the ECU is defective, as this is an informational code.

2. 2

   Connect the CNH Electronic Service Tool (EST) and check the ECU failure memory for other active lead failures (primary DTCs).

3. 3

   Look for primary faults related to engine overspeed, turbocharger overboost, critical coolant/oil temperatures, or exhaust gas/DEF system failures that would command an engine shutdown or derate.

1. 1

   Connect Diagnostic Tool

   Hook up the CNH EST (Electronic Service Tool) to the machine's diagnostic port.

2. 2

   Read All Codes

   Pull all active and stored fault codes from the Engine Control Unit (ECU).

3. 3

   Identify the Lead Fault

   Locate the primary fault code that triggered the engine protection mode (the injection cut-off demand). OEM manuals state that F-3607-14 should always appear in failure memory with another lead failure from ECM.

4. 4

   Repair the Root Cause

   Follow the diagnostic and repair procedure for the primary fault code (e.g., replacing a faulty temperature sensor, clearing a blocked intake, or fixing a turbocharger issue).

5. 5

   Clear the Memory

   Once the primary issue is resolved, clear the fault memory. The F-3607-14 code will clear automatically because the engine speed limitation is no longer being requested by the shut-off coordinator.