Development perspectives of on board diagnostic system in light of new approvals of vehicles

The first rules of on board diagnostic were published in 1981. The standard had been improved in the next years, until the condition of today and also in the future, which result is presently used OBD II system, and in the close future - OBD III. On-board diagnostic system – OBD II is present in most passenger and utility vehicles in USA; the idea originated on the turn of 70-ties and 80-ties. It was dictated by the willingness to control engine functions and to diagnose related subassemblies. One of the methods to reduce emission of toxic components is continuous control over engine elements that are directly or indirectly responsible for level of emission of these components. Introduction of these requirements caused creation of the self-diagnostic definition and utilising innovation definition self-diagnostic: All the diagnostic devices have been designed according to main goal of the OBD standard, i.e.: one connector – one cable – one device – all diagnostic data now and in the future. In my paper I would like to present our results of investigations the level implementation diagnostic procedures (monitors) in vehicles (equip in SI and CI engines) with new approvals in Poland and basic terms in OBD system and OBD standards.