![]() OBD-II is an expanded set of standards and practices developed by SAE and adopted by the EPA and CARB (California Air Resources Board) for implementation by January 1, 1996. The EPA adapted most of their standards from the SAE on-board diagnostic programs and recommendations. In 1988, the Society of Automotive Engineers (SAE) set a standard connector plug and set of diagnostic test signals. These sensors were also accessed to provide early diagnostic assistance.Īt first there were few standards and each manufacturer had their own systems and signals. Sensors measured engine performance and adjusted the systems to provide minimum pollution. To meet these standards, manufacturers turned to electronically controlled fuel feed and ignition systems. This started a series of graduated emission standards and requirements for maintenance of vehicles for extended periods of time. The federal government extended these controls nationwide in 1968.Ĭongress passed the Clean Air Act in 1970 and established the Environmental Protection Agency (EPA). To combat its smog problem in the LA basin, the State of California started requiring emission control systems on 1966 model cars. OBD-II, a new standard introduced in the mid-'90s, provides almost complete engine control and also monitors parts of the chassis, body and accessory devices, as well as the diagnostic control network of the car. Through the years on-board diagnostic systems have become more sophisticated. This was primarily to meet EPA emission standards. During the '70s and early 1980's manufacturers started using electronic means to control engine functions and diagnose engine problems. On-Board Diagnostic systems are in most cars and light trucks on the road today. ![]()
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