Case IH 17801 (F-520354-31) - ECU – Engine Control Unit (ECU / ECM): ECU internal failure - Safety Management Unit Alarm Group 2 Failure 18 issued

Internal plausibility check failure, memory stack error, or calibration error within the Engine Control Module's Safety Management Unit, compromising its own safety monitoring capabilities.

• VESTRUM CVX
• Case IH Austoft 9000 and 9900 Series Sugarcane Harvesters
• Case IH Axial-Flow Combines (e.g., 7240, 7250)
• Machines utilizing the MTA CCM & APH Stage V MR transmission/engine configurations

1. 1

   Check the ECM Power Relay: Ensure the relay is not loose or faulty, which can cause intermittent power drops.

2. 2

   Check the Battery Disconnect Switch: Verify that the battery disconnect switch was not inappropriately disconnected while the ECM was still powered and writing to its non-volatile memory.

3. 3

   Check System Voltage: Test the battery and alternator voltage. Voltage spikes (SRC high) or severe drops during cold starts can cause the ECU to log internal safety management faults.

4. 4

   Check for Parallel Level 1 Errors: Note any other codes present, though the diagnostic procedure for this Level 2/3 internal error is independent of Level 1 errors.

1. 1

   Connect diagnostic tool

   Connect the diagnostic service tool (e.g., EST) to the machine's diagnostic port.

2. 2

   Erase fault code

   Erase the Level 2/3 error (17801) from the fault code memory.

3. 3

   Cycle power and test

   Cycle the machine's power and operate the engine to see if the fault returns.

4. 4

   Evaluate fault return

   If the error does NOT reappear, do not replace the ECU. The fault was likely a ghost failure or caused by a temporary voltage/power disconnect anomaly. Erasure of the fault code memory is sufficient.

5. 5

   Replace and program ECU

   If the error DOES reappear, the ECU has suffered a hard internal hardware or calibration failure and must be replaced. Note: If it is strictly a dataset/calibration error, contact the Helpdesk to flash a replacement dataset before physical replacement. Replacement ECUs will require programming/calibration with the specific machine's dataset using the CNH Electronic Service Tool (EST) upon installation.