The "PSA Interface Checker" is a niche but critical utility for Peugeot and Citroën owners who use Lexia 3 or DiagBox diagnostic tools. Version 4.4.0 is a specific, widely-used iteration of this software, primarily utilized to manage the firmware of the VCI (Vehicle Communication Interface) The Role of PSA Interface Checker

4.4 CAN Bus Verification (Most Common Use)

1. Connect breakout adapter to OBDII (pins 6= CAN-H, 14= CAN-L).
2. Select CAN-L mode:

   The Hardware Bridge: Mechanics and DIYers use a physical cable called an XS Evolution Lexia 3. Because many of these units are aftermarket clones, they often come with outdated firmware that prevents them from communicating with newer cars or updated software like Diagbox 7.02 and above.

   Firmware Management: Users can manually upgrade or downgrade their VCI firmware to match specific versions of Diagbox, Lexia, or Peugeot Planet 2000 (PP2000).

   : Displays the current firmware version and the serial reference of the hardware. Select File : Used to choose the firmware file (often found in the folder of a DiagBox installation). Downloading

   Install the "PSA Interface Checker Install.exe" to your PC (typically Windows 7 32-bit or XP is recommended). Connection:

   • DiagBox v7.83 to v9.91: Full telecoding, injection coding, key programming.
   • PP2000 (Planète Peugeot): All functions for models up to 2014.
   • Lexia 3 (for Citroën): Full bidirectional control.
   • Opel Global TIS (for older Opel/Vauxhall based on PSA platforms).