Design and Development of On-Board Diagnostic (OBD) Device for Cars

This paper presents the design and development of On-Board Diagnostic (OBD) device for cars and its working based on OBD-II standards defined by SAE. This device shows the real-time status of vehicle's systems and sub-systems including engine speed rpm, coolant temperature, pressure etc. and Diagnostic Trouble Codes (DTCs). The software used in this system has been primitively developed which shows the faults in the system. This device helps the user to understand real-time status of vehicle as well as it makes easier to check the malfunctioning in vehicles systems and subsystems by displaying Diagnostic Trouble Codes DTCs). This device doesn't have battery hence it drives power from vehicle battery. The communication between OBD connector and PC is wireless communication.