This complete system is called as an ECU ( Engine Control Unit). Apart from this it also measures some of the important vital parameters of an Engine. As the name suggests it is a diagnosis system that is built into all modern cars (after 1996) which has a computer based application that monitors the performance of your car through your speed, mileage, fuel emission data etc. OBD stands for Onboard Built-in Diagnosis. It follows asynchronous serial communication protocol, this pin is the L line It follows asynchronous serial communication protocol, this pin is the K line It follows 2-wire CAN protocol at 1Mbps speed. Ground of complete system of the Car including chassis This is the Bus negative pin of the protocol. This protocol uses Variable Pulse Width and is normally used by GM vehicles. This is the Bus positive pin of the protocol. It is also not required for normal communication/interfacing These pins are not standard and are vendor specific.
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