OBD-II pin Definition

In order to better ensure the safety of vehicles and protect the environment. After 1996, automakers began to equip cars and trucks with OBD-II ports. Each system is basically the same, but there will be subtle changes. These are called agreements and are specific to the vehicle manufacturer.

The diagnostic trouble code is stored in the computer system. There are many manufacturers in the world, and the codes may be different. However, anyone with an OBD-II scanning tool can connect to the port and read the diagnostic trouble code from the computer. The reason why the OBD-II scanning tool reads the code is due to the standardized pin arrangement. The standardized pin assignments are as follows.

Pin 1: Used by the manufacturer

Pin 2: by SAE J1850 PWM and VPW

Pin 3: For manufacturer use only

Pin 4: Ground

Pin 5: Ground

Pin 6: CAN used by ISO 15765-4 CAN

Pin 7: K-ISO 9141-2 and ISO 14230-4 lines

Pin 10: Only by SAE J1850 PWM

Pin 14: by ISO 15765-4 CAN

Pin 15: ISO 9141-2 and ISO 14230-4

Pin 16: Car battery power supply

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