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A Study of the Relative Benefits of On-Board Diagnostics and Inspection and Maintenance in California
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Abstract
California is considering adopting an enhanced Inspection and Maintenance (I&M) program (commonly referred to as Smog Check II) beginning with the 1996 calendar year. This program will utilize a targeting scheme to identify vehicles likely to be high emitters and send these vehicles to centralized testing facilities. The remaining fleet of vehicles will be sent to decentralized testing facilities. At these facilities, vehicles will be subjected to steady state loaded mode dynamometer based tests. Simultaneously, all 1996 and later model year passenger cars, light- and medium-duty trucks sold in California will be equipped with an On-Board Diagnostic (OBDII) system. This system is designed to monitor critical emission related components and activate a Malfunction Indicator Light (MIL) when a failure or a drift in calibration is likely to cause emissions to exceed 1.5 times the vehicle certification standards. The main objective of this paper is to ascertain what percentage of the emission benefits are attributable to either I&M or OBDII in order to assist regulators in making near term programmatic decisions. This paper also addresses the potential emission benefits of incorporating a radio transponder into the vehicle's OBDII system that is capable of transmitting fault codes when queried, resulting in prompt identification and repair.
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Authors
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Citation
Patel, D. and Carlock, M., "A Study of the Relative Benefits of On-Board Diagnostics and Inspection and Maintenance in California," SAE Technical Paper 951944, 1995, https://doi.org/10.4271/951944.Also In
References
- Development Of The California I&M Benefits Model (CALIMFAC) Sierra Research, Inc. June 1990
- July 1995
- On-Board Diagnostics (OBDII) System Requirements For 1994 And Later Passenger Cars, Light-Duty Trucks And Medium Duty Trucks Equipped With Feedback Fuel Control Systems California Code Of Regulations
- Sierra Research, Inc. “Task Order Contract For Emission Inventory Projects” 1 September 23 1991
- Macomber, S. Kingsley Sierra Research, Inc. “Legal Aspects Of Transponder Technology” CARB Contract No. A096-214 January 27 1994