How to Erase Benz 4th Generation 7-Speed TCU Using Launch X431 ECU Programmer?
The Launch X431 tool has recently received a significant upgrade with its V10.40 software update, released on January 13, 2025. This update introduces advanced ECU and TCU cloning capabilities, including read, write, personalization, and clearing functions for Benz transmission TCU models such as the VGS4-0-NAG2 and VGS4-500-NAG2. These functions are accessible via Boot mode and make the Launch X431 a versatile solution for replacing and re-authorizing second-hand gearbox computers.
Compatible Devices
The new features are supported by the following Launch devices:
• Launch X431 ECU & TCU Programmer
• X431 X-prog3 with PC Adapter
• Launch X431 scanners equipped with SmartLink C and X-prog3 (via USB connection)
Steps to Erase and Personalize the Benz 4th Generation 7-Speed TCU
Here’s a detailed guide to using the Launch X431 ECU Programmer for erasing and personalizing a Benz 4th generation TCU:
1. Connect the X431 ECU Programmer to a PC
• Launch the PC software and enter the ECU model into the system (e.g., VGS4).
2. Access the Direct Connection Wiring Diagram
• Follow the on-screen instructions and click “OK” to proceed.
3. Select the Wiring Mode
• The wiring diagram will display two modes: BENCH and BOOT.
• Use BENCH mode to read data from the original vehicle’s gearbox computer.
• For wiping and personalizing an external second-hand gearbox computer, ensure both BENCH and BOOT modes are connected simultaneously.
4. Read TCU Information
• After completing the connections, click “Read TCU Information” to access the existing data.
5. Read EEPROM Data
• In BENCH mode, click “Read EEPROM Data (BENCH).”
• If BENCH mode fails to read the data, switch to BOOT mode and retry.
6. Connect the External ECU Computer
• After reading the original vehicle’s ECU data, disconnect the original ECU and connect the X431 ECU Programmer to the external ECU computer.
• Ensure both BENCH and BOOT modes are connected simultaneously.
7. Erase the External ECU
• Click “Erase” to clear the external ECU data.
8. Personalize the ECU
• Click “Personalization” and select the original car’s EEPROM data to write.
• Click “OK” once the personalization process is successful.
9. Confirm Data Erasure
• Click “Read TCU Information” again to confirm that the ECU data has been successfully erased.
10. Install and Complete Programming
• Reinstall the ECU back into the vehicle.
• Complete the programming and coding process to finalize the setup.
Conclusion
The latest software update for the Launch X431 tools makes it a highly effective solution for handling advanced ECU and TCU operations. By following these steps, technicians can efficiently erase, personalize, and program Benz 4th generation 7-speed TCUs, ensuring seamless integration of second-hand gearbox computers into vehicles.
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