Case IH 3999 – Engine Control Module (ECM) / Engine Control Unit (ECU): ECM engine fault not converted in CNH module

The emissions system (SCR/DEF) has detected a fault of the same class type more than three times within a 40-hour operating window, triggering a maximum inducement (engine derate or idle lock) and preventing emergency restarts until reset via dealer software.

• MAXXUM T4E
• VESTRUM CVX
• Puma series
• Steiger series
• Magnum series
• Farmall series
• Axial-Flow Combines (7230, 8230, 9230)

1. 1

   Connect the CNH Electronic Service Tool (EST).

2. 2

   Check for the underlying active urea/DEF system faults that caused the inducement lock (e.g., NOx sensor implausibility such as Code 17538, DEF quality sensor timeouts, or DEF dosing issues).

3. 3

   Acknowledge that the inducement lock must be cleared before you can properly verify the physical repair of the underlying emissions fault.

1. 1

   Connect diagnostic tool

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

2. 2

   Navigate to Configuration

   Navigate to the Configuration menu/icon in the EST.

3. 3

   Select reset screen

   Select the "Engine Restart Counter Reset / Unlock Inducement" screen.

4. 4

   Configure item

   Click on "CONFIGURE SELECTED ITEM".

5. 5

   Reset counter

   Click the button "RESET ENGINE RESTART COUNTER / UNLOCK INDUCEMENT" to clear the inducement lock.

6. 6

   Resolve root cause

   Once the system is unlocked, follow the appropriate diagnostic procedure to resolve the specific DEF/AdBlue system faults that originally triggered the lock.

7. 7

   Verify repair

   Finally, perform the SCR Fault Repair Verification Test using the EST to ensure the root cause is fully resolved before returning the machine to service.