Psa Interface Checker 4.4.0 ★ 〈VALIDATED〉

Before downloading, ensure your environment meets these specs:

Running DiagBox inside a VM (VirtualBox/VMware)? Add this filter to your VM’s USB settings:

| Error Message | Likely Cause | Fix | | :--- | :--- | :--- | | No USB Communication | Driver conflict or wrong COM port | Go to Device Manager → Ports → Set COM port to 1, 2, 3, or 4 (not higher). | | Voltage too low (8.4V) | Poor ground or weak battery | Connect a battery charger. The interface needs 12V to switch relays. | | VAN Bus Error | Wrong vehicle selected | VAN is only for 2001-2007 models (e.g., Peugeot 406). Do not test CAN cars on VAN. | | K-Line Short to Ground | Aftermarket radio or alarm | Disconnect non-factory accessories from the OBD port. | | Timeout on all protocols | Blown OBD fuse | Check vehicle’s cigar lighter fuse (often shared with OBD port). | psa interface checker 4.4.0

After each session, the tool saves a log in C:\ProgramData\PSA\InterfaceChecker\Logs. Search for the string [ERROR] to find the exact point of failure. You can paste these logs into forums for expert help.

The 4.4.0 version can force a specific protocol. This is useful for testing broken OBD pins. Click “Manual Mode” → Select ISO 15765-4 (11-bit ID) to isolate a CAN High/Low break. After each session, the tool saves a log

Run through this 60-second protocol using PSA Interface Checker 4.4.0:

☐ Launch checker before DiagBox.
☐ Confirm “Vehicle Voltage: 12.4V – 14.2V”.
☐ Check “Latency (Avg)” – must be under 10ms.
☐ Run “Extended Test” for 30 seconds – no frame drops.
☐ Save the .psalog to your desktop as a backup. Pro Tip: If 4

If all boxes are green, you may proceed to programming. If any test fails, stop immediately – you risk corrupting the BSI.

A significant reason people search for this specific version is related to clone interfaces. Original PSA interfaces cost thousands; most hobbyists use cloned (Chinese) units. Over the years, PSA updated their checkers to deactivate clones.

Pro Tip: If 4.4.0 says "Counterfeit detected," your DiagBox software will still work, but you may experience random disconnections during ECU flashing. Upgrade your hardware.