
Development of OBDII On-board diagnostics (OBD) is a term referring to a vehicle’s self-diagnostic and reporting capability. OBD systems can monitor the working status of the engine electronic control system and other functional modules of the on-road vehicles in real time. The vehicle owner or repair technician can use the special instrument of the original automobile factory to read the trouble code, so as to quickly locate the malfunction, facilitate vehicle maintenance, and reduce the time for manual diagnosis. Difference between OBDI and OBDII port Before OBDI, each automobile manufacturer had its own set of OBD standards, which meant that mechanics