Toyota 4D Key Tool V1.1 is a specialized utility for immobilizer repair and key generation for a range of Toyota vehicles, primarily from the 2005-2010 model years. The software's main function is to generate new transponder key data from an EEPROM dump file that has been read from the vehicle's immobilizer ECU (also known as the Transponder ID ECU).
Common Problems This Tool Solves
• The vehicle has no working transponder key.
• The immobilizer system has logged an error code for "wrong transponder" or "transponder ID is not registered".
• The engine starts for only 2 seconds and then stops, which indicates an immobilizer system problem.
How It Works
On these Toyota models, the immobilizer data is stored in a dedicated Transponder ID ECU. This tool analyzes an EEPROM dump from that module and calculates the cryptographic data required to create a new master (black) key.
Simple Workflow
Remove the Immobilizer (Transponder ID ECU) from the vehicle.
Open the module and read the EEPROM memory with a compatible programmer.
Load the EEPROM dump file into the Toyota 4D Key Tool.
Click the "Generate crypto for key's" button.
The tool will generate the new key data, which will be displayed in the "Key information" fields.
Use a separate transponder programming tool (such as Codereader, ZedBull, or RW4) to write this generated data onto a TPX2 or EH transponder (electronic 4D emulator).
System Compatibility
This software has been fully tested and is confirmed to be working perfectly on Windows 10 LTSC (2019).
Disclaimer
• Source of Files: All software and resources provided in this post have been collected from public, open-source domains on the internet.
• User Responsibility: This is a professional tool for expert use. You, the user, assume all responsibility and risk. The authors of this post and the forum administration are not liable for any damage to your equipment or data that may result from its use.
Common Problems This Tool Solves
• The vehicle has no working transponder key.
• The immobilizer system has logged an error code for "wrong transponder" or "transponder ID is not registered".
• The engine starts for only 2 seconds and then stops, which indicates an immobilizer system problem.
How It Works
On these Toyota models, the immobilizer data is stored in a dedicated Transponder ID ECU. This tool analyzes an EEPROM dump from that module and calculates the cryptographic data required to create a new master (black) key.
Simple Workflow
Remove the Immobilizer (Transponder ID ECU) from the vehicle.
Open the module and read the EEPROM memory with a compatible programmer.
Load the EEPROM dump file into the Toyota 4D Key Tool.
Click the "Generate crypto for key's" button.
The tool will generate the new key data, which will be displayed in the "Key information" fields.
Use a separate transponder programming tool (such as Codereader, ZedBull, or RW4) to write this generated data onto a TPX2 or EH transponder (electronic 4D emulator).
System Compatibility
This software has been fully tested and is confirmed to be working perfectly on Windows 10 LTSC (2019).
Disclaimer
• Source of Files: All software and resources provided in this post have been collected from public, open-source domains on the internet.
• User Responsibility: This is a professional tool for expert use. You, the user, assume all responsibility and risk. The authors of this post and the forum administration are not liable for any damage to your equipment or data that may result from its use.
