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Title 13, California Code Regulations, Section 1968.2

Malfunction and Diagnostic System Requirements for 2004 and Subsequent Model-Year Passenger Cars, Light-Duty Trucks, and Medium-Duty Vehicles and Engines(OBD II). OAL-Approved Final Regulation Order for OBD II and Emission Warranty Regulations: approved on November 9, 2007.

« (1.1) Requirement | 目录 | (1.3) Monitoring Conditions »

(1.2) Malfunction Criteria:

(1.2.1) Low Emission Vehicle I applications:

The OBD II system shall detect a catalyst system malfunction when the catalyst system’s conversion capability decreases to the point that either of the following occurs:

(A) Non-Methane Organic Gas (NMOG) emissions exceed 1.75 times the FTP full useful life standards to which the vehicle has been certified with NMOG emissions multiplied by the certification reactively adjustment factor for the vehicle;
(B) The average FTP test Non-Mathane Hydrocarbon (NMHC) conversion efficiency of the monitored portion of the catalyst system falls below 50% percent(i.e., the cumulative NMHC emissions measured at the outlet of the monitored catalyst(s) are more than 50 percent of the cumulative engine-out emissions measured a thee inlet of the catalyst(s)). With Executive Officer approval, manufacturers may use a conversion efficiency malfunction criteria of less than 50 percent if the catalyst system is designed such that the monitored portion of the catalyst system must be replaced along with an adjacent portion of the catalyst system sufficient to ensure that the total portion replaced will meet the 50 percent conversion efficiency criteria. Executive Officer approval shall be based on data and/or engineering evaluation demonstrating the conversion efficiency of the monitored portion and the total portion designed to be replaced, and the likelihood of the catalyst system design to ensure replacement of the monitored and adjacent portions of the catalyst system.

(1.2.2) Low Emission Vehicel II applications and all 2009 and subsequent model year vehicles:

(A) 2004 model year vehicles.
- (i) All LEV II, ULEV II, and MDV SULEV II vehicles shall use the malfunction criteria specified for Low Emission Vehicle I applications in section (e)(1.2.1).
- (ii) All PC/LDT SULEV II vehicles shall use the malfunction criteria specified for Low Emission Vehicle I applications in section (e)(1.2.1) except the malfunction criterion in paragraph (e)(1.2.1)(A) shall be 2.5 times the applicable FTP full useful life NMOG standard.
(B) Except as provided below in section (e)(1.2.4), for 2005 through 2008 model years, the OBD II system shall detect a catalyst system malfunction when the catalyst system’s conversion capability decreases to the point that any of the following occurs:
- (i) For all veicles oter than PC/LDT SULEVE II vehicles.
  - a. NMOG emissions exceed the criteria specified for Low Emission Vehicle I applications in section (e)(1.2.1)(A).
  - b. The average FTP test NMHC conversion efficiency is below the criteria specified for Low Emission Vehicle I application in section (e)(1.2.1)(B).
  - c. Oxides of nitrogen (NOx) emissions exceed 3.5 times the FTP full useful life NOx standard to which the vehicle has been certified.
- (ii) PC/LDT SULEV II vehicles shall use the same malfunction criteria as 2005 through 2008 mode year LEV II, ULEV II, and MDV SULEV II vehicles (section (e)(1.2.2)(B)(i)) except the malfunction criteria in paragraph a. shall be 2.5 times the applicable FTP full useful life NMOG standard.
© Except as provided below in section (e)(1.2.5), for 2009 and subsequent model years, the OBD II system shall detect a catalyst system malfunction when the catalyst system’s conversion capability decreases to the point that any of the following occurs.
- (i) For all vehicles other than PC/LDT SULEV II vehicles.
  - a. NMOG emissions exceed the criteria specified for Low Emission Vehicle I applications in section (e)(1.2.1)(A).
  - b. The average FTP test NMHC conversion efficiency is below the criteria specified for Low Emission Vehicle I applications in section (e)(1.2.1)(B).
  - c. NOx emissions exceed 1.75 times the FTP full useful life NOx standard to which the vehicle has been certified.
- (ii) For PC/LDT SULEV vehicles.
  - a. NMOG emissions exceeds 2.5 times the applicable FTP full useful life NMOG standard to which the vehicle has been cetified.
  - b. The average FTP test NMHC conversion efficiency is below the criteria specified for Low Emission Vehicle I applications in section (e)(1.2.1)(B).
  - c. NOx emissions exceed 2.5 times the applicable FTP full useful life NOx standard to which the vehicle has been certified.

(1.2.3)

2004 through 2008 model year Nnon-Low Emission Vehicle I or II applications: The OBD II system shall detect a catalyst system malfunction when the catalyst system’s conversion capability decreases to the point that NMHC emissions increase by more than 1.5 times the applicable FTP full useful life standards over an FTP test performed with a representative 4000 mile catalyst system.

(1.2.4)

In lieu of using the malfunction criteria in section (e)(1.2.2)(B) for all 2005 and 2006 model year Low Emission Vehicle II applications, a manufacturer may phase-in the malfunction criteria on a portion of its Low Emission Vehicle II applications as long as that portion of Low Emission Vehicle II applications comprises at least 30 percent of all 2005 model year vehicles and 60 percent of all 2006 model year vehicles. For 2005 and 2006 model year Low Emission Vehicle II applications not included in the phase-in, the malfunction criteria in section (e)(1.2.2)(A) shall be used.

(1.2.5)

In lieu of using the malfunction criteria in section (e)(1.2.2)© for all 2009 model year vehicle, for the 2009 model year only, a manufacturer may continue to use the malfunction criteria in section (e)(1.2.2)(B) for any vehicles previously certified in the 2005, 2006, 2007, or 2008 model year to the malfunction criteria in section (e)(1.2.2.)(B) and carried over to the 2009 model year.

(1.2.6)

For purposes of determining the catalyst system malfunction criteria in sections (e)(1.2.1), (1.2.2)(A), and (1.2.3), the malfunction criteria shall be established by using a catalyst system with all monitored catalysts simultaneously deteriorated to the malfunction criteria while unmonitored catalysts shall be deteriorated to the end of the vehicle’s full useful life.

(1.2.7)

(A) The manufacturer shall use a catalyst system deteriorated to the malfunction criteria using methods established by the manufacturer to represent real world catalyst deterioration under normal and malfunctioning operating conditions.
(B) Except as provided below in section (e)(1.2.7)©, the malfunction criteria shall be established by using a catalyst system with all monitored and unmonitored (downstream of the sensor utilized for catalyst monitoring) catalysts simultaneously deteriorated to the malfunction criteria.
© For vehicles using fuel shutoff to prevent over-fueling during misfire conditions (see section (e)(3.4.1)(D)), the malfunction criteria shall be established by using a catalyst system with all monitored catalysts simultaneously deteriorated to the malfunction criteria while unmonitored catalysts shall be deteriorated to the end of the vehicle’s full useful life.