Case IH F-628-14 - ECU – Engine Control Unit (ECU / ECM): ECU internal failure - write access to non volatile memory failed for at least one block.

The control module's internal non-volatile memory (EEPROM or Flash memory) has suffered a write error. The module is physically unable to save or overwrite data to at least one memory block. This can prevent the module from storing operational parameters, after-run data, or new fault codes, and is often caused by cutting battery power before the module has completed its shutdown/after-run sequence.

• MAGNUM AFS Connect
• Case IH Austoft 9000 and 9900 Sugarcane Harvesters
• Case IH Axial-Flow 7250, 8250, and 9250 Combines
• Various Case IH tractors equipped with FPT Cursor engines and MTA CCM & APH Stage V MR on-board diagnostics

1. 1

   Check Operator Habits: Verify that the operator is not using the battery disconnect switch to shut down the machine while the engine is running or immediately after key-off. The ECU requires a timed after-run duration to write data.

2. 2

   Inspect Power and Ground: Check the battery voltage, alternator output, and the main wiring harness to the ECU. Look for high resistance, loose grounds, or corroded pins.

3. 3

   Test the Main Relay: A sticky or failing main power relay can cause intermittent voltage drops during the ECU's memory-write phase.

4. 4

   Clear the Memory: Connect the Case IH Electronic Service Tool (EST) and attempt to delete the stored faults. If the error was sporadic, clearing the memory and allowing a proper key-off cycle may resolve it.

1. 1

   Disconnect the machine's batteries (Negative cable first).

   Disconnect the machine's batteries (Negative cable first).

2. 2

   Locate the Engine ECU on the side of the FPT engine block.

   Locate the Engine ECU on the side of the FPT engine block.

3. 3

   Carefully release the locking levers on the ECU wiring harness connectors and unplug them. Inspect the pins one last time for pushed-out terminals or moisture.

   Carefully release the locking levers on the ECU wiring harness connectors and unplug them. Inspect the pins one last time for pushed-out terminals or moisture.

4. 4

   Remove the mounting bolts securing the ECU to the engine block and remove the faulty module.

   Remove the mounting bolts securing the ECU to the engine block and remove the faulty module.

5. 5

   Install the replacement ECU and torque the mounting bolts to OEM specifications.

   Install the replacement ECU and torque the mounting bolts to OEM specifications.

6. 6

   Reconnect the wiring harnesses, ensuring the locking levers are fully seated.

   Reconnect the wiring harnesses, ensuring the locking levers are fully seated.

7. 7

   Reconnect the batteries.

   Reconnect the batteries.

8. 8

   Connect the Case IH EST diagnostic laptop to the machine's diagnostic port.

   Connect the Case IH EST diagnostic laptop to the machine's diagnostic port.

9. 9

   Flash the blank/reman ECU with the correct engine software and calibration files specific to the machine's Product Identification Number (PIN).

   Flash the blank/reman ECU with the correct engine software and calibration files specific to the machine's Product Identification Number (PIN).

10. 10

    Perform a test run, followed by a proper key-off sequence. Wait for the ECU to complete its after-run cycle, then turn the key back on to verify the F-628-14 code has not returned.

    Perform a test run, followed by a proper key-off sequence. Wait for the ECU to complete its after-run cycle, then turn the key back on to verify the F-628-14 code has not returned.