86.098-28—Compliance with emission standards.
(4)
The procedure for determining compliance of a new motor vehicle with exhaust, evaporative and/or refueling emission standards (or family particulate emission limit, as appropriate) is as described in paragraphs (a)(4)(i) introductory text, (a)(4)(i)(C), (a)(4)(ii)(B) and (C), (a)(4)(iii), (a)(4)(v), (f) and (g) of this section and § 86.094-28 (a)(4)(i)(A) and (B), (a)(4)(ii)(A), (a)(4)(iv)) except where specified by paragraph (a)(7) of this section for the Production AMA Durability Program.
(i)
Separate emission deterioration factors shall be determined from the exhaust emission results of the durability-data vehicle(s) for each engine-system combination. Separate evaporative and/or refueling emission deterioration factors shall be determined for each evaporative/refueling emission family-emission control system combination from the testing conducted by the manufacturer (gasoline-fueled and methanol-fueled vehicles only). Separate refueling emission deterioration factors shall be determined for each evaporative/refueling emission family-emission control system combination from the testing conducted by the manufacturer (petroleum-fueled diesel cycle vehicles not certified under the provisions of paragraph (g) of this section only).
(C) Evaporative deterioration factor determination.
An evaporative emissions deterioration factor (gasoline-fueled and methanol-fueled vehicles only) shall be determined from the testing conducted as described in § 86.094-21(b)(4)(i)(A), and in accordance with paragraphs (a)(4)(i)(C) (1) and (2) of this section, for each evaporative/refueling emission family-emission control system combination to indicate the evaporative emission level at the applicable useful life relative to the evaporative emission level at 4,000 miles as follows:
(1) Factor = Evaporative emission level at the useful life mileage for that standard minus the evaporative emission level at 4,000 miles.
(2) The factor shall be established to a minimum of two places to the right of the decimal.
(D)
A refueling emissions deterioration factor (gasoline-fueled, methanol-fueled and petroleum-fueled diesel-cycle vehicles not certified under the provisions of paragraph (g) of this section) shall be determined from testing conducted and described in § 86.098-21(b)(4)(i)(B) for each evaporative/refueling emission family-emission control system combinationto indicate the refueling emission level at the applicable usefule life relative to the refueling emission level at 4,000 miles as follows:
(1) Factor = Refueling emission level at the useful life mileage for that standard minus the refueling emission level at 4,000 miles.
(2) The factor shall be established to a minimum of two places to the right of the decimal.
(B)
The official evaporative emission test results (gasoline-fueled and methanol-fueled vehicles only) for each evaporative emission-data vehicle at the selected test point shall be adjusted by addition of the appropriate deterioration factor: Provided, that if a deterioration factor as computed in paragraph (a)(4)(i)(C) of this section is less than zero, that deterioration factor shall be zero for the purposes of this paragraph.
(C)
The official refueling emission test results (gasoline-fueled, methanol-fueled, and petroleum-fueled diesel cycle vehicles not certified under the provisions of paragraph (g) of this section) for each refueling emission-data vehicle at the selected test point shall be adjusted by addition of the appropriate deterioration factor: Provided, that if a deterioration factor as computed in paragraph (a)(4)(i)(D) of this section is less than zero, that deterioration factor shall be zero for purposes of this paragraph.
(v)
Every test vehicle of an evaporative/refueling emission family must comply with the evaporative and/or refueling emission standards, as determined in paragraph (a)(4)(iii) of this section, before any vehicle in that family may be certified.
(a)
(7)
The procedure to determine the compliance of new motor vehicles in the Production AMA Durability Program described in § 86.094-13 is the same as described in paragraphs (a)(4)(iii) and (v) of this section and § 86.094-28 (a)(4)(iv). For the engine families that are included in the Production AMA Durability Program, the exhaust emission deterioration factors used to determine compliance shall be those that the Administrator has approved under § 86.094-13. The evaporative emission deterioration factor for each evaporative /refueling emission family shall be determined and applied according to paragraph (a)(4)(ii)(B) of this section. The refueling emission deterioration factor for each evaporative/refueling emission family shall be determined and applied according to paragraph (a)(4)(ii)(C) of this section. The procedures to determine the minimum exhaust emission deterioration factors required under § 86.094-13(d) are as described in paragraph (a)(7)(i) of this section and § 86.094-28 (a)(7)(ii).