What is iso-9141-2?

ISO 9141-2 is a standard protocol used for diagnostic purposes in automotive systems. It specifies the requirements for the serial communication link between a vehicle's onboard diagnostic system (OBD-II) and diagnostic devices such as scan tools or code readers.

The ISO 9141-2 protocol uses a single wire (K-line) to transmit data between devices at a baud rate of 10.4 kbps. It supports a range of diagnostic functions, including reading and clearing diagnostic trouble codes (DTCs), monitoring sensor values, and controlling actuators.

The standard was first published in 1994 and has since been adopted by many car manufacturers as a standard diagnostic interface for their vehicles. It is also used in conjunction with other standards such as CAN (Controller Area Network) to provide a complete diagnostic solution for modern automotive systems.

Overall, the ISO 9141-2 protocol has played an important role in improving the diagnostic capabilities of automotive technicians and reducing repair costs for vehicle owners.