How to use Launch X431 IMMO Plus/IMMO Elite to replace a BMW MSD81.2 Engine ECU (DME) with a used one?
We can read the ISN from the original ECU, modify the new ECU’s flash, and write the ISN to make it compatible with the car. The same procedure applies to MSD80, MSD85, MSV80, and other models.
Steps to replace the ECU:
- Select the Replacement Function
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- Navigate to BMW Function > Main Function > Engine Module Replacement > Bench Mode > MSD81_TC1796.
- Check the wiring diagram for proper connections.
2. Connect the Original ECU
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- Use the X-Prog3 and connect the original ECU following the wiring diagram.
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- Establish a connection with the ECU (security login may take some time).
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- Read Chip ID
3. Back Up the Original ECU Flash Data
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- Select the option to Back Up Flash Data from the original ECU.
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- Save the flash data securely.
4. Extract ISN Code from the Original ECU
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- Select Flash Data Decryption to retrieve the 32-digit ISN code from the original ECU.
- Record the ISN code for future use.
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- Disconnect the original ECU
5. Connect the Replacement ECU
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- Connect the replacement ECU to the X431 X-Prog3 following the same wiring diagram.
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- Establish a connection (perform security login).
6. Back Up the Replacement ECU Flash Data
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- Back up the flash data of the donor ECU and save it.
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- Extract the ISN from the donor ECU’s flash data.
7. Modify the Replacement ECU ISN
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- Go to the Change ISN function.
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- Input the 32-digit ISN code retrieved from the original ECU.
- Modify the ISN successfully and save the updated flash data.
8. Verify the Updated ISN Code
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- Extract the ISN code from the updated flash data and confirm it matches the original ECU’s ISN.
9. Write the Updated Flash Data to the Replacement ECU
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- Select the Restore Flash Data function.
- Write the updated flash data back to the replacement ECU successfully.
10. Install and Test
- Disconnect the ECU and install it back into the vehicle.
- Test to ensure the replacement ECU works properly with the car.
Success!
Alright! That’s the whole process to clone BMW MSD81.2 DME by Launch X-431 IMMO Plus/X431 IMMO Elite key programmer.