Xhorse Multi Prog Write VIN to Hyundai Used SIM2K-341 ECU

 How-to guide: Program a Junkyard Engine Computer: Writing a VIN to a Used Hyundai/Kia SIM2K-341 ECU.

 

When it comes to replacing or reprogramming an Engine Control Unit (ECU) in a vehicle, one of the most critical steps is ensuring that the Vehicle Identification Number (VIN) is correctly programmed into the used or junkyard ECU. This process is essential for the vehicle to function properly and for the ECU to communicate effectively with other systems in the car. In this article, we’ll walk you through the steps of programming a VIN into a used ECU Hyundai SIM2K-341.

Tools You’ll Need:

1. Abrites or similar tool: Used to power the ECU and read the VIN before and after programming.
2. Xhorse Multi Prog: A device that connects to the ECU and allows you to read and write data.
3. Godiag GT100 breakout box: Used to power the ECU to read the VIN before and after programming.
4. HxD (Hex Editor): A software tool used to edit the binary data in the ECU file.

NOTE: PCMFlash can read this PCM without opening, for some reason it cannot write a changed file.multi prog is fine.

Step-by-Step Guide to Programming a VIN into a Used ECU

 

Step 1: Power Up the ECU and Read the Existing VIN

1. Connect the Godiag GT100: Start by connecting the Godiag to the ECU to provide power. This allows you to read the existing VIN stored in the ECU.
2. Read the VIN: Using the diagnostic tool (in this case, the Abitus software), read the VIN from the ECU. This VIN (KM8JUCAC1AU033811) will likely be from the donor vehicle (the junkyard car). Make sure the ignition is on while reading the VIN.

Step 2: Connect the Multi prog to the ECU

1. Refer to the Pinout Diagram: The Multiprog tool requires a specific pinout to connect to the ECU. Ensure you have the correct pinout diagram for your vehicle’s ECU.
2. Connect the Multiprog: Once you’ve identified the correct pins, connect the Multi-prog to the ECU using the appropriate connectors.

Step 3: Read the ECU Data

1. Read the ECU File: Using the Multi prog, read the data from the ECU. This process may take a few moments as the tool buffers and reads the data.
2. Save the File: Once the data is read, save the file to your computer. In this example, the file is saved as “Hyundai_read_multi_channel_47.”

Step 4: Edit the VIN in the ECU File

1. Open the File in HxD: Load the saved file into the HxD hex editor. This software allows you to view and edit the binary data in the ECU file.
2. Locate the VIN: Search for the existing VIN in the file. In this case, the VIN was identified as “811.”
3. Replace the VIN: Use the “search and replace” function in HxD to replace the old VIN with the new VIN that the customer needs. In this example, the new VIN is “ KM8JUCAC8AU031523.”
4. Save the Edited File: Once the VIN has been replaced, save the file with a new name, such as “523_VIN.”

Step 5: Write the New VIN to the ECU

1. Open the Edited File in Multi prog: Load the newly saved file (e.g., “523_VIN”) into the Multi prog software.
2. Write the VIN to the ECU: Use the Multi prog to write the edited file back to the ECU. This process will overwrite the old VIN with the new one.

Step 6: Verify the VIN Change

1. Disconnect the Multi prog: Once the writing process is complete, disconnect the Multi prog from the ECU.
2. Read the VIN Again: Use the Abitus software to read the VIN from the ECU once more. Confirm that the VIN has been successfully changed to the desired number (in this case, “523”).
3. Verify Vehicle Details: Ensure that the ECU now recognizes the correct vehicle details, such as the make, model, and market (e.g., “Pixon 2010 US market”).

Conclusion

Programming a VIN into a used or junkyard ECU is a detailed process that requires the right tools and careful attention to detail. By following the steps outlined above, you can successfully reprogram a used SIM2K-341 PCM/ECU to match the VIN of the vehicle it’s being installed in. This process is especially useful when dealing with older vehicles or when a dealership is unable to perform the task.

 

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