​How Does OBD-II Work

Diagnostic Trouble Codes (DTC) are stored in the computer system. Codes can vary from one manufacturer to another. However, anyone with an OBD-II scan tool can connect to the port and read the diagnostic trouble codes from the computer.

The reason any OBD-II scan tool can read the codes is because of the standardized pinout. Scan tools can read from any of the protocols listed above. The standardized pinout is as follows.

Pin 1: Used by manufacturer

Pin 2: Used by SAE J1850 PWM and VPW

Pin 3: Used by manufacturer

Pin 4: Ground

Pin 5: Ground

Pin 6: Used by ISO 15765-4 CAN

Pin 7: The K-Line of ISO 9141-2 and ISO 14230-4

Pin 10: Used only by SAE J1850 PWM

Pin 14: Used by ISO 15765-4 CAN

Pin 15: The K-Line of ISO 9141-2 and ISO 14230-4

Pin 16: Power from the car battery

OBD-II scanners can connect to these ports and identify the trouble code from any manufacturer that uses one of the OBD-II protocols.

Yahui is a PVC molding and assembly wiring harness factory, providing obd2 adapters and obd2 connector for obd2 diagnostic instruments for more than 13 years. If you are interested in this aspect or have any questions, please consult us.

More about NEWS(What Can Be Hooked Up to the OBD-II Port?).