Case IH 17791 (F-520349-31) - ECU – Engine Control Unit (ECU) / Engine Control Module (ECM): ECU internal failure - Safety Management Unit Alarm Group 1 Failure 1 issued

The internal Safety Management Unit within the engine's control module has detected a Level 2 or Level 3 internal fault or calibration error. This code can sometimes be triggered as a functional dependency alongside Level 1 errors.

• VESTRUM CVX
• Austoft 9900 Sugarcane Harvesters
• Farmall Tractors (40, 45, 50 models with Cab and CVT)
• Puma
• Magnum

1. 1

   Recognize that the procedure is independent of Level 1 errors that may have been entered in parallel due to functional dependencies.

2. 2

   Connect the diagnostic tool and perform an erasure of the fault code memory.

3. 3

   Cycle the machine/engine to see if the error reappears.

1. 1

   Clear the Memory

   Erase the fault code memory using the dealer diagnostic tool.

2. 2

   Evaluate

   Condition A: If the Level 2/3 error does not reappear, do not replace the ECU. The erasure of the fault code memory is sufficient to resolve the phantom calibration error. Condition B: If the Level 2/3 error does reappear, it confirms a hard internal failure within the module.

3. 3

   Replace

   If Condition B is met, the ECU must be physically replaced.

4. 4

   Reprogram

   Replacement valve assemblies and ECUs are supplied blank or with no numbers assigned. The new ECU must be flashed and calibrated to the specific machine, and any electronic remotes/valves must be reprogrammed into the new sequence.