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NEW : Android port



DDT4All is tool to create your own ECU parameters screens and connect to a CAN network with a cheap ELM327 interface.

This application is work in progress, so be very careful when using expert mode. Using the application in non expert mode should not be harmful for your vehicle (leave the expert mode button released).

Important :

Do not use this software if you don't have a strong knowledge of how a CAN network (or ECU) works, you can really do bad things with it, especially if you're working on a vehicle

The author declines all responsibility about a bad use of this tool. You are the only responsible

This tool is mainly aimed for CAN ISO_TP network study

Dependencies :

  • Python 3.8
  • PyQt 5
  • An ELM327, ELS327 or OBDLink SX

Windows installer

Get the fully packaged installer here : Release area

Supported diagnostic adapters (so far)

  • ELM327 USB/BlueTooth/WiFi (Original one with PIC18F25K80, Chinese clone not working)
  • ObdLink SX
  • ELS27

Features :

  • Read/Clear DTC
  • Manual ECU request
  • Log recorder
  • Plugins system for automated functions
  • CAN / KWP2000 supported bus protocols
  • AutoScan ECUs and select the related files
  • Internal JSON file format for high speed parsing
  • Database zip compression of converted JSON files
  • Can bus sniffing (Read/Decode non-ISOTP frames)
  • Screen recorder (via autorefresh button) and export to CSV format

How to launch the application ?

  • Windows : double click DDT4ALL.BAT file
  • Linux : from a terminal, type python


  • Gnu/Linux (Ubuntu approved)
  • Windows (For winXP, 2000, vista, try the 'winXP' branch)
  • MacOS



No serial connection

  • Linux : Check user rights to access serial port Ubuntu
  • Windows :
    • Check serial drivers installation
    • Try to disable antivirus software


Windows archive with embedded Python/PyQt here

Bugtracking here :

Happy CAN-Hacking :)

To make this application more reliable, I need to buy hardware, cables and devices, so please consider contributing by making a donation (hardware or money). Of course you can contribute by filling bug reports and sending patches. Donate