OBD 1 Smart System is a gas sequential injection gas supply framework. At the point when the framework works, the gas ECU takes the fuel injection signal from the original vehicle as the basic signal and gathers the parameters of the motor colling water temperature, gas pressure, and different parts simultaneously to conclude the last gas injection time and gas rail injector supply gas to the comparing engine chamber. Inside the allowed scope of engine cylinder volume, the framework will give a gas that is equivalent to the energy of the gasoline when the switch is in the gas position, the gas ECU will automatically defect the conversion conditions which are already present in the ECU. At the point when the condition is met, the framework will change to the gas. As of now, the gas injection nozzle is cut off, and the gas system ECU drives the gas rail injector to begin working.