§ 86.1008-96 - Test procedures.

Section 86.1008-96 includes text that specifies requirements that differ from § 86.1008-90. Where a paragraph in § 86.1008-90 is identical and applicable to § 86.1008-96, this is indicated by specifying the corresponding paragraph and the statement “[Reserved]. For guidance see § 86.1008-90.” Where a corresponding paragraph of § 86.1008-90 is not applicable, this is indicated by the statement “[Reserved].”

(a)(1)(i) For heavy-duty engines, the prescribed test procedure is the Federal Test Procedure, as described in subparts N, I, and P of this part.

(ii) During the testing of heavy-duty diesel engines, the manufacturer shall decide for each engine, prior to the start of the initial cold cycle, whether the measurement of background particulate is required for the cold and hot cycles to be valid. The manufacturer may choose to have different requirements for the cold and hot cycles. If a manufacturer chooses to require the measurement of background particulate, failure to measure background particulate shall void the test cycle regardless of the test results. If a test cycle is void, the manufacturer shall retest using the same validity requirements of the initial test.

(2) For light-duty trucks, the prescribed test procedures are the FTP as described in subparts B, C, and P of this part and the CST as described in subpart O of this part. The manufacturer may not perform the evaporative emission test procedure contained in subpart B. The Administrator may, based on advance application by a manufacturer, approve optional test procedures for use in Selective Enforcement Audit Testing.

(3) [Reserved]. For guidance see § 86.1008-90.

(4) When testing light-duty trucks the following exception to the test procedures in subpart O of this part is applicable: manufacturer need not comply with § 86.1442, since the records required therein are provided under other provisions of subpart K of this part.

(ii) In addition to the requirements of subpart O of this part the manufacturer must prepare vehicles as described in paragraphs (a)(4)(ii) (A) through (C) of this section prior to exhaust emission testing.

(A) The manufacturer must inspect the fuel system to insure the absence of any leaks of liquid or vapor to the atmosphere by applying a pressure of 14.5 ± 0.5 inches of water to the fuel system, allowing the pressure to stabilize, and isolating the fuel system from the pressure source. Pressure must not drop more than 2.0 inches of water in five minutes. If required, the manufacturer performs corrective action in accordance with this section and must report this action in accordance with § 86.1009.

(B) When performing this pressure check, the manufacturer must exercise care to neither purge nor load the evaporative system.

(C) The manufacturer may not modify the test vehicle's evaporative emission control system by component addition, deletion, or substitution.

(5) [Reserved]. For guidance see § 86.1008-90.

(6) The Administrator may select and prescribe the sequence of any CSTs. Further, the Administrator may, on the basis of a written application by a manufacturer, prescribe minor test procedure variations from those set forth in paragraphs (a) (1) and (2) of this section for any heavy-duty engine or light-duty truck.

(b) through (i) [Reserved]. For guidance see § 86.1008-90.