This guide covers the structure of the database, how to update it, and how to fix common database errors.
Visual instructions that tell the software how to display the car's data in a readable format for the user. How to Install and Update the Database ddt4all database
| Problem | Likely Database Cause | Solution | | :--- | :--- | :--- | | DDT4All won't start | Corrupt vehicles.json or main XML | Delete vehicles.json (it regenerates) or restore backup. | | ECU shows "Not Supported" | Missing XML definition | Find a database update pack. | | Buttons do nothing | Screen file logic error | Edit the JSON/XML screen file. | | "Request Length Mismatch" | Incorrect Byte Array in XML | Edit the XML request block; the length tag doesn't match data. | This guide covers the structure of the database,
Understanding where the data lives is the first step. In your DDT4All installation folder, the database is primarily located in the ecus directory. | | ECU shows "Not Supported" | Missing