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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.

« (9.1) Requirement | 目录 | (9.3) Monitoring Conditions »

(9.2) Malfunction Criteria:

(9.2.1)

For the purposes of section (e)(9), “PCV system” is defined as any form of crankcase ventilation system, regardless of whether it utilizes positive pressure. “PCV valve” is defined as any form of valve or orifice used to restrict or control crankcase vapor flow. Further, any additional external PCV system tubing or hoses used to equalize crankcase pressure or to provide a ventilation path between various areas of the engine (e.g., crankcase and valve cover) are considered part of the PCV system “between the crankcase and the PCV valve” and subject to the malfunction criteria in section (e)(9.2.2) below.

(9.2.2)

Except as provided below, the OBD II system shall detect a malfunction of the PCV system when a disconnection of the system occurs between either the crankcase and the PCV valve, or between the PCV valve and the intake manifold.

(9.2.3)

If the PCV system is designed such that the PCV valve is fastened directly to the crankcase in a manner which makes it significantly more difficult to remove the valve from the crankcase rather than disconnect the line between the valve and the intake manifold (taking aging effects into consideration), the Executive Officer shall exempt the manufacturer from detection of disconnection between the crankcase and the PCV valve.

(9.2.4)

Subject to Executive Officer approval, system designs that utilize tubing between the valve and the crankcase shall also be exempted from the portion of the monitoring requirement for detection of disconnection between the crankcase and the PCV valve. The manufacturer shall file a request and submit data and/or engineering evaluation in support of the request. The Executive Officer shall approve the request upon determining that the connections between the valve and the crankcase are:

(i) resistant to deterioration or accidental disconnection,
(ii) significantly more difficult to disconnect than the line between the valve and the intake manifold, and
(iii) not subject to disconnection per manufacturer’s repair procedures for non-PCV system repair work.

(9.2.5)

Manufacturers are not required to detect disconnections between the PCV valve and the intake manifold if said disconnection (1) causes the vehicle to stall immediately during idle operation; or (2) is unlikely to occur due to a PCV system design that is integral to the induction system (e.g., machined passages rather than tubing or hoses).