Psa Interface Checker -

1. What is the PSA Interface Checker? The PSA Interface Checker (often referred to as a breakout box or diagnostic interface tester) is a hardware device used between a vehicle’s diagnostic socket (OBD-II) and a diagnostic tool (like DiagBox, PP2000, or Lexia). Its purpose is to intercept, measure, and verify signals on the vehicle’s communication networks: CAN , K-Line , ISO 9141 , and VAN (older PSA vehicles).