Transcription of On-Board Diagnostics (OBD) Program Overview
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On-Board Diagnostics (OBD) Program Overview
1 On-Board Diagnostics (OBD) Program Overview California Air Resources Board Allen Lyons April 2015 Mexico City 2 Presentation Outline oOBD History and Background oOBD Requirements oOBD Certification oOBD Enforcement oOBD and Smog Check Certification Enforcement Regulations 3 OBD II Regulation - History Adopted by Air Resources Board in 1989 oImplementation began in 1994 oFull Implementation achieved in 1996 oOver 150 million OBD II-equipped vehicles operating in the United States today Vehicle Applications (< 14,000 pounds) oPassenger cars oLight-duty trucks oMedium-duty vehicles and engines OBD requirements adopted for heavy-duty vehicles in 2005 (HD OBD, > 14,000 pounds) oFull implementation in 2013 4 Keeping In-use Cars and Trucks Clean Low emission vehicles depend on numerous and complex emission controls to clean up a dirty combustion process oEmission solutions are increasingly complex Malfunctions can increase emissions to many times the certification standards oDeterioration oImproper maintenance oManufacturing defects oTampering 5 On-Board Computer Modern vehicles use On-Board computers oControl fuel metering (fuel injection) oActuate EGR and purge valves, etc.
• Show whether or not major monitors have run since computer memory was last clear. • When the indicators are “ready”, it means that the OBD system is ready for inspection • When too many indicators are “not ready”, faults could exist that haven’t been detected yet by the OBD system
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