Psa+interface+checker+440+2021 Site

PSA Interface Checker 4.4.0 (2021) is a specialized diagnostic utility used by Peugeot and Citroën (PSA Group) technicians and DIY enthusiasts. It is designed to verify the firmware version of Diagbox interfaces and ensure compatibility between the hardware (Lexia 3 / XS Evolution) and the software (Diagbox). 🛠️ What is PSA Interface Checker 4.4.0?

Multiple forum users have noted that serial numbers can vary in screenshots of the PSA Interface Checker, and different numbers may indicate different hardware generations or factory revisions.

To properly check or update your interface, follow these standard steps:

| LED Color | Meaning | Example | |-----------|---------|---------| | | Healthy communication | CAN-H (pin 6) = 2.5V to 3.5V, CAN-L (pin 14) = 1.5V to 2.5V | | Yellow | Marginal / intermittent | Voltage correct but no ACK from one ECU | | Red | Faulty / no signal | Short to ground, open circuit, or wrong termination | | Flashing Red | Protocol mismatch | Vehicle expects CAN FD, tool set to classic CAN | psa+interface+checker+440+2021

The tool displays "INIT KO" after clicking ACTIVATE, and no interface information can be read.

While there is no standalone "2021" edition, the versions frequently circulated in recent years (such as v4.4.0) remain the standard for maintaining diagnostic stability with modern Diagbox updates. Core Functions Firmware Verification : Instantly identifies if your hardware is a Revision B or the more desirable Revision C

: Displays the current firmware version installed on the device. PSA Interface Checker 4

The is a dedicated hardware testing device designed exclusively for PSA Group vehicles. Unlike a generic multimeter or oscilloscope, the IC-440 communicates directly with the vehicle’s diagnostic socket (OBD-II) using native PSA protocols.

Ensure the USB driver ( Actia USB Device ) is properly installed in the Device Manager before running the interface checker.

One of the primary reasons automotive enthusiasts use the PSA Interface Checker is to verify the hardware capabilities of third-party Lexia 3 clones purchased online. Feature / Detail Full Chip Interface Lite / Low-Cost Clone Displays as 921815 C/ May display as 921815 B/ or fake C Optocouplers Present (protects car & laptop circuits) Omitted or bridged with resistors Microcontroller High-quality Samsung/Fujitsu chip Downgraded or generic alternative Diagbox Evolution Works seamlessly with Diagbox V7, V8, and V9+ Frequently fails or freezes on newer cars Multiple forum users have noted that serial numbers

Verification of the OSEK/ AUTOSAR Network Management logic is crucial. The checker will validate the ring logic, sleep transition times, and repeat message request handling. A common failure in 2021 audits is the mishandling of the NM Coordinator role in complex topologies.

: Verifies that the computer recognizes the VCI through the USB connection without needing to be plugged into a car.