40 CFR § 86.530-78 - Test sequence, general requirements.

---
identifier: "/us/cfr/t40/s86.530-78"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 86.530-78 - Test sequence, general requirements."
title_number: 40
title_name: "Protection of Environment"
section_number: "86.530-78"
section_name: "Test sequence, general requirements."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "86"
part_name: "CONTROL OF EMISSIONS FROM NEW AND IN-USE HIGHWAY VEHICLES AND ENGINES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401-7671q."
cfr_part: "86"
---


# 86.530-78 Test sequence, general requirements.

(a) Ambient temperature levels encountered by the test vehicle throughout the test sequence shall not be less than 20 °C (68 °F) nor more than 30 °C (86 °F). The vehicle shall be approximately level during the emission test to prevent abnormal fuel distribution.

(b) [Reserved]