In today’s automotive world, ECUs (Engine Control Units) are at the heart of vehicle performance, safety, and efficiency. These sophisticated modules manage everything from ignition timing and fuel injection to emission control and turbocharging. As vehicles become more complex, so does the need for powerful tools to program, clone, and tune these ECUs.
This is where Hexprog II, a professional ECU Programming Tool, comes into play. Designed for precision and flexibility, Hexprog II allows users to perform ECU cloning, chip tuning, and repairs with confidence. In this article, we’ll deep dive into one of the ECUs supported by Hexprog II, the BOSCH ME17.9.1, found in the Hyundai Genesis Sedan. You’ll learn how to safely clone this ECU in Boot Mode, and discover other advanced features Hexprog II offers, such as online file services like DTC removal and lambda sensor off.Let’s get started.
Understanding the ME17.9.1 ECU by BOSCH
The BOSCH ME17.9.1 is a widely used engine control unit found in various Hyundai and Kia vehicles. It's part of BOSCH’s MED/ME family of ECUs, designed for efficient fuel management, ignition control, and emissions regulation. With its 32-bit processor and integrated EEPROM and Flash memory, the ME17.9.1 offers robust performance while remaining compact and durable.
Key features of the ME17.9.1 ECU include:
- Flash memory that stores the calibration data and program code.
- EEPROM that holds immobilizer and VIN information.
- Integrated OBD diagnostics for fault detection and monitoring.
- Secure architecture, which requires Boot Mode access for advanced operations like cloning.
Because of its encryption and security protocols, this ECU cannot be cloned through OBD or BENCH. Accessing it requires opening the ECU case and using Boot Mode, which allows Hexprog II to communicate directly with the microcontroller and memory.
Hexprog II: A Complete ECU Programming Tool
Hexprog II is a next-generation ECU programming tool designed for automotive professionals, tuners, and repair shops. Supporting thousands of ECUs and TCUs from major brands such as BOSCH, Siemens, and Delphi, it offers a comprehensive solution for ECU cloning, chip tuning, ECU/TCU repair, and online file services such as DTC delete and Lambda off.
In addition to cloning, Hexprog II also provides safe and efficient reading and writing of ECU data, giving users reliable access to internal memories. It performs exceptionally well with BOSCH ECUs like the ME17.9.1, offering full support for Boot Mode programming. Key features include high-speed read/write operations for both Flash and EEPROM, automatic checksum correction, detailed pinout diagrams with Boot Mode instructions, free software updates, and an integrated online file service.
For those working on vehicles such as Hyundai and Kia equipped with the ME17.9.1 ECU, Hexprog II remains one of the most dependable and versatile tools available.
Cloning the BOSCH ME17.9.1 ECU with Hexprog II: A Detailed Step-by-Step Process
Preparation
Before starting the cloning process, ensure you have all necessary equipment ready. You’ll need:
- Hexprog II ECU Programming Tool Hardware
- Hexprog II Tuner Software (with a valid ECU Cloning license)
- A regulated 13V power supply
- Boot Mode wiring diagram for the ME17.9.1 ECU (provided within the Hexprog Software)
- Tools to open the ECU (heat gun, blade, or pry tools)
- Probe or soldering equipment to access Boot pins on the PCB
Since the ME17.9.1 cannot be cloned via OBD or BENCH mode, the ECU must be physically opened to access Boot Mode on the internal board. Always ensure your workspace is clean, static-safe, and well-lit to avoid damage to sensitive components.
Once all equipment is ready, you're set to begin the cloning process.
Accessing Boot Mode (Required for Cloning)
to start the cloning process:
- Open the ECU carefully by heating and separating the lid. Be patient to avoid cracking the board or components inside.
- Use the Boot Mode diagram in the Hexprog II software to locate the required pins on the ECU PCB.
- Connect all lines securely to Hexprog II using probes or soldered connections, depending on the layout.
- Once the ECU is properly wired, power it on using your regulated power supply. The Hexprog software will detect and confirm connection to the ME17.9.1 in Boot Mode.
Remember: Boot Mode is the only supported method for cloning this ECU. Bench and OBD modes are not applicable.
Reading Original ECU Data
With the Boot Mode connection active:
- Launch the Hexprog II software and select “Read EEPROM” to extract the vehicle-specific information like VIN, immobilizer data, and configuration settings.
- Then select “Read Flash” to extract the operational software and calibration maps for chip-tuning and modifications.
These two files, EEPROM and Flash, are critical for ECU tuning. The files are saved in .bin format and include all essential data required to replicate the ECU on a donor unit.
Hexprog II, ECU Programming Tool, will handle checksum correction automatically during read and write operations, ensuring safe data integrity.
Creating a Backup
Immediately after reading the EEPROM and Flash, create a backup using the “Backup” function in the Hexprog II software. This generates a full archive of the ECU’s content, which should be saved securely and labelled clearly for future use and cloning.
This backup ensures that in the event of a failed clone or accidental overwrite, you can restore the original ECU content without loss of data.
Preparing the Donor ECU Next, prepare your donor ECU:
- It must be of the same BOSCH ME17.9.1 hardware version.
- Ensure the ECU is in good working condition and not previously locked or tampered with.
- Open the donor ECU just like the original, exposing the PCB for Boot Mode access.
Connect the donor ECU to Hexprog II using the same Boot Mode wiring method. Double-check your pinout diagram and connections before proceeding.
Restoring Data onto the New ECU
With the donor ECU connected in Boot Mode: Restore the previously saved Backup file, this ensures that VIN, immobilizer, and coding are cloned correctly.
Hexprog II will validate both files and apply any necessary checksum corrections automatically, if necessary, but for cloning, there is no need to calculate the checksum.
Once the file is written successfully, the donor ECU becomes a clone of the original unit.
Optional: Back up the original content of the donor ECU before overwriting it, in case you need to revert it for other vehicles.
Testing and Verification
After cloning, reinstall the cloned ECU in the vehicle.
Perform the following checks:
- Confirm engine start and smooth idle
- Verify communication with other modules via OBD
- Ensure no fault codes are present (unless previously stored)
- Check immobilizer sync and dashboard behavior
If everything runs correctly, the cloning is complete. If issues arise, re-check the original read/write files, and confirm compatibility of the donor ECU.
Finalization
Once you’ve verified full functionality, reassemble the ECU and seal it properly. Reinstall it in the vehicle securely and ensure all connections are tight and clean.
Use ECU Programming Tool to do a final scan of the ECU, and confirm successful cloning by comparing the VIN and calibration IDs.
Your Hyundai Genesis Sedan should now be running with a fully cloned BOSCH ME17.9.1 ECU — identical in behavior and function to the original.
Optional: File Services for ME17.9.1
Hexprog II also supports limited online file services for the ME17.9.1 ECU, including:
- Delete Fault Codes (DTC Off)
- Lambda Sensor (O2) Off
These are accessible directly through the Hexprog II online portal www.hexprog.com. After reading the Flash file, simply upload your file, select the service, and receive your modified version within a few hours, Checksum correction will be done in hexprog II Tuner software when writing.
Users can read the Flash with Hexprog and modify it using third-party tuning software, then write the modified file back using Hexprog II.
From hardware repair to DTC removal and sensor deactivation, Hexprog II is a powerful, reliable tool for anyone working in ECU programming and tuning.
Real-World Example: Hyundai Genesis Sedan with ME17.9.1
Hyundai Genesis Sedan is known for its refinement and power. The ME17.9.1 ECU controls key engine functions and integrates tightly with the vehicle’s immobilizer and diagnostics systems.
Scenarios where cloning may be needed include:
- ECU Water Damage
- Microprocessor or Flash failure
- Tuning rollback or hardware replacement
- ECU Swapping between vehicles
Using Hexprog II, technicians and workshop owners can reliably clone the damaged ECU to a donor unit without losing immobilizer sync or requiring dealer tools. This makes it a preferred solution in both tuning and repair workflows.
Why Choose Hexprog II ECU Programming Tool Over Others?
Hexprog II delivers several competitive advantages for professionals:
- Supports true Boot Mode access for BOSCH ECUs like ME17.9.1 and supports other Modes like OBD and Bench for thousands of ECUs
- Fast, stable read/write operations
- Automatic checksum repair
- User-friendly software with ECU diagrams and help tips
- Built-in access to online file services
In short, Hexprog II is more than just an ECU Programming Tool, it’s a full ecosystem for anyone working in ECU repair, chip tuning, or diagnostics.
Final Thoughts
When it comes to ECU Cloning, especially on complex units like the BOSCH ME17.9.1, the right tool is everything. Hexprog II simplifies the process through guided Boot Mode access, automatic checksum correction, and easy-to-use software, all while maintaining professional-grade reliability.
For anyone working on vehicles like the Hyundai Genesis Sedan, Hexprog II is an essential asset for cloning, tuning, and ECU repairs.
Ready to elevate your tuning and diagnostic game? Try Hexprog II, the trusted ECU Programming Tool built for professionals.
More info about ME17.9.1
HEXPROG II is a specialized ECU Chip Tuning and Programming Tool capable of reading and writing all the contents of the ME17.9.1 ECU using Boot Mode. For more detailed information about the ME17.9.1, ECU and the features of HEXPROG II Chip Tuning and ECU Programming Tool, please refer to the following links:
- Hexprog II ME17.9.1 ECU Details: HexProg Hyundai ME17.9.1 Details
- Hexprog II Product Page: HexProg II Ecu Programming/Chip Tuning Tool
- Hexprog II ordering page: Hexprog II Lite Chip Tuning Tool, Hexprog II Chip Tuning Tool Full Set
- License Package: Hexprog II List for Package HPP01
