A/C diagnosis: Provides technicians with process-oriented, digitalized and standardized A/C diagnosis, and dynamically tests temperature (both ambient and air-outlet in cabin), pressure (high side and low side), refrigerant concentration, and humidity, and instructs technicians to perform human tests on appearance, abnormal noise, odor, etc., to ensure a thorough A/C system inspection with no omissions, and intelligently analyzes the working conditions of the A/C parts (parts of A/C loop, electronic control, fluid media and air distribution) based on these dynamic data. In addition, by communicating with the automobile ECU , it recognizes VIN code and reads A/C fault codes (OBD generic and OE protocol), reads data stream, etc., to diagnose the electronic sensors and electronic control unit of the A/C. ACDOC86+ is the world's most comprehensive diagnostic and analysis instrument for automobile air conditioners. After all the tests are completed, a digital diagnosis form is presented to the car owner, to help garages make service proposals with transparency and data basis.