Case IH 17633 (F-518242-31) - ECU – Engine Control Unit (ECU): ECU internal failure - Diagnostic fault check to report 'Errorpin active'

The engine's control module has detected an internal hardware fault, a secure check failure, or a calibration error, which has triggered the module's internal error pin to become active.

• VESTRUM CVX
• Austoft Sugarcane Harvesters 9000 series
• Austoft Sugarcane Harvesters 9900 series
• Axial-Flow Combines 7240
• Axial-Flow Combines 8240
• Axial-Flow Combines 9240
• Farmall Tractors 40
• Farmall Tractors 45
• Farmall Tractors 50
• Farmall Tractors 115U
• Farmall Tractors 120U

1. 1

   Check battery voltage and alternator output (high battery voltage, low voltage during a cold start, or a defective alternator can simulate an internal failure)

2. 2

   Inspect the main engine wiring harness and ECU connectors for defects, corrosion, or high resistance that could interrupt secure data checks

3. 3

   Clear the fault stack and retest; if the code immediately returns upon key-on or engine cranking, it indicates a hard internal failure

1. 1

   Disconnect battery

   Disconnect the machine's battery power to prevent electrical arcing.

2. 2

   Disconnect ECU harness

   Disconnect the main wiring harness connectors from the Engine Control Unit.

3. 3

   Remove defective ECU

   Unbolt and remove the defective ECU from its mounting bracket.

4. 4

   Install replacement ECU

   Install the replacement or remanufactured ECU and secure the mounting hardware.

5. 5

   Reconnect harness

   Reconnect the wiring harness securely.

6. 6

   Program new ECU

   Using the Case IH dealer diagnostic tool (e.g., EST), flash/program the new ECU with the correct software payload and calibration files for the specific machine and engine tier.

7. 7

   Clear codes and verify

   Clear all historical fault codes and run the machine to verify the 'Errorpin active' code does not return.