Hanatech Co., Ltd..
Chapter 5
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Generic OBD2
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I. Literal definition of OBD and OBD2-------
OBD is an abbreviati on for On Board D iagnosti cs. OBD -1 is in reference to
Ti tle 13 Cali fornia Code 1968 titled "Mal functi on and Diagnostic System for
1988 and Subsequent Model Year P assenger Cars, Li ght-Duty Trucks, and
Medium -Duty Vehicles with Three-Way Catalyst Systems and Feedback
Control." filed on 11-15-85. This required cars sol d in California to have an
on-board computer processor for on-board self-diagnostics of com puter
sensed emission related components, fuel metering device and EGR
(exhaust gas recalculati on system). A partial or total malfuncti on that
exceeded exhaust emission standard would ill uminate a MIL (m alfunction
i ndi cator li ght) and provi de on-board identi ficati on of the m alfunction
l ocati on. To provi de mal function l ocati on inform ation, codes are stored in on-
board com puter m emory. To read codes manufactures use methods, such
as flashing MIL li ght or various serial data protocols.
OBD -2 is in reference to Title 13 California Code 1968.1 titled "Malfuncti on
and Diagnosti c System Requirements-1994 and Subsequent Model-Year
Passenger Cars, Light-Duty Trucks, and Medium -Duty Vehi cl es and
Engines. Filed on 8-27-90 to Air Resouce Board (ARB)
This requires a standard electrical connector, open source standardized
diagnostic trouble codes (DTC), data, and com municati on protocol w ith more
speci fi c sel f-diagnosti c on-board m oni tori ng of emission malfunctions.
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