Case IH F-518164-31 - ECU – Engine Control Unit (ECU): ECU Internal Failure - Injection quantity limited by Level 2 controller check

The Engine Control Unit (ECU) has detected an internal calculation, memory, or monitoring error (specifically during a Level 2 controller self-check) regarding the fuel injection quantity. As a safety and emissions precaution, the ECU forces the engine into a derated state, limiting the fuel injection quantity to prevent engine runaway or excessive emissions.

• MAGNUM AFS Connect
• Austoft 9000 Series
• Austoft 9900 Series
• Axial-Flow Combines (7230, 8230, 9230, 7260)
• Magnum Tractors
• Steiger Tractors

1. 1

   Clear the fault code memory using a diagnostic tool

2. 2

   Ensure the engine is warm and turn off all auxiliary loads (AC, lamps, and additional auxiliaries)

3. 3

   Start the engine and let it run at standard low idle

4. 4

   Monitor the injection quantity via the diagnostic tool to see if the Level 2/3 error reappears

5. 5

   Check for special auxiliaries and adapt auxiliary strategies if necessary, as abnormal loads can trigger false internal calculation faults

1. 1

   Determine if the fault is a transient error (Scenario A).

   If the error does NOT reappear after performing the diagnostic checks, do not replace the ECU. The fault was a transient error. Erasure of the fault code memory is sufficient to complete the repair.

2. 2

   Determine if the ECU has suffered a hard internal failure (Scenario B).

   If the error DOES reappear after the diagnostic checks, you must replace the Engine Control Unit (ECU).

3. 3

   Flash and calibrate the new ECU.

   After replacement, flash the new ECU with the correct machine software and calibrate it to the engine/immobilizer system using the CNH Electronic Service Tool (EST).