§ 86.427-78 Emission tests.
(a)
(1) Each test vehicle shall be driven with all emission control systems installed and operating for the following total test distances, or for such lesser distances as the Administrator may agree to as meeting the objectives of this procedure. (See § 86.419 for class explanation.)
Table 1 to § 86.427–78—Test Specifications by Displacement Class
| Displacement class | Total test distance (kilometers) | Minimum test distance (kilometers) | Minimum number of tests |
|---|---|---|---|
| I–A | 6,000 | 2,500 | 4 |
| I–B | 6,000 | 2,500 | 4 |
| II | 9,000 | 2,500 | 4 |
| III | 15,000 | 3,500 | 4 |
(2) A zero kilometer emission test may be performed prior to the beginning of service accumulation.
(b) All vehicles shall undergo at least four emission tests; one at the minimum test distance, one before and one after periodic maintenance, and one at the total test distance. If no maintenance is scheduled, then at least two tests will be performed, at equal intervals, between the minimum and total test distances. Additional tests may be performed; such tests must be at equal intervals and approved by the Administrator prior to starting service accumulation.