The time to complete 15 warm-up cycles and drive 200 miles is reasonable for vehicles to complete the self-diagnostic tests. Why will PDTCs be ignored when the vehicle has completed 15 warm-up cycles and been driven 200 miles since the codes were cleared? What is a warm-up cycle?Ī warm-up cycle means driving a vehicle so that the engine coolant temperature rises by at least 40 degrees Fahrenheit after the engine is started and reaches at least 160 degrees Fahrenheit. PDTCs will be ignored if the vehicle has completed at least 15 warm-up cycles and been driven at least 200 miles since its OBD information was last cleared. Are there circumstances under which a PDTC will not cause a vehicle to fail a Smog Check inspection? What is the estimated increase in Smog Check inspection failure rate for the inclusion of PDTCs?īAR analysis indicates the new requirement could initially increase Smog Check inspection failure rates by less than half a percent (0.2 to 0.3%). Vehicles that do not support PDTC storage will not be subject to this part of the Smog Check inspection. In the meantime, BAR will control application of such vehicles through the Smog Check database, and list them in the On-Board Diagnostic Test Reference. What if the vehicle does not properly support PDTC functionality?īAR is working with the Air Resources Board (ARB) to ensure that known problematic vehicles are addressed by the vehicle manufacturers.
The new criteria will apply to model-year 2010 and newer vehicles that support PDTCs. Which model-year vehicles will include PDTCs as part of the Smog Check inspection? If a PDTC is stored, it indicates that the OBD system has not yet successfully verified that a previously detected emissions-related malfunction is no longer active. Upon implementation, vehicles that have a PDTC stored in the OBD system will fail the Smog Check inspection regardless of whether the malfunction indicator light is illuminated. How are PDTCs going to be used as part of a Smog Check inspection? Although the use of readiness monitors reduces the chances of passing a Smog Check inspection with an active DTC, PDTCs can further ensure emission control systems are working correctly. This can have a dramatic impact on air quality and decrease the effectiveness of the Smog Check Program. Some of these vehicles can pass a Smog Check inspection before the vehicle can re-identify the underlying problem that set the malfunction indicator light and DTC(s). Unplugging the vehicle’s battery or using a scan tool are techniques sometimes used to clear OBD information for a vehicle that has an illuminated malfunction indicator light in an attempt to hide the fact that the vehicle is malfunctioning. Why are PDTCs being included in the Smog Check Program? Starting July 1, 2019, the presence of PDTCs will be considered in determining the vehicle’s Smog Check inspection result. When will PDTCs be included as part of the Smog Check inspection failure criteria? The Bureau of Automotive Repair (BAR) has been conducting outreach on the use of PDTCs with the industry and vehicle manufacturers, including two BAR Advisory Group presentations, a separate workshop, two BAR newsletter articles, and ET Blasts. What outreach has been done to obtain stakeholder input?
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Including PDTCs in the Smog Check Program will implement another OBD inspection development in accordance with California Code of Regulations, title 16, section 3340.42.2(c)(5). What regulations are applicable to PDTCs? When the monitor runs without identifying a problem, the PDTC will clear itself. The only way to clear a PDTC is to fix the underlying problem with the vehicle that originally caused the PDTC and its corresponding DTC to set, and then allow the vehicle sufficient drive time to re-run the monitor that identified the problem in the first place. However, unlike regular DTCs, they cannot be reset by disconnecting the vehicle’s battery or cleared using an On-Board Diagnostic (OBD) scan tool. Permanent Diagnostic Trouble Codes (PDTCs) are very similar to regular Diagnostic Trouble Codes (DTCs). Permanent Diagnostic Trouble Codes What are Permanent Diagnostic Trouble Codes?
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