Automotive diagnostic adapter is used for connecting the car fault diagnostic scanner and the ECU auto diagnostics software. Generally there will be a testing wire prepared for the scanner to connect different diagnostic adapters, which can be connected directly with ECU socket. With the connection between the scanner, the adapter and ECU, user will get to know the ECU parameters of their cars, thus determining where the fault is. JSTAR diagnostic adapters are suitable for various car models, such as Benz 38Pin, BMW 20pin, Honda 3pin, Kia 20pin, Nissan 14pin, Mitsubishi 12pin, modern 12pin, Toyota 17pin, and OBDII.