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.
1. Does the MIL work? (Key on engine off) 2. Is the vehicle ready for an inspection? No recent code clearing 3. Is the MIL commanded off? If YES to all 3: PASS If NO, remedy as necessary: Fix MIL lamp or wiring Conduct more in-use driving and return for re-inspection Fix detected fault and return for re-inspection
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