Document ID: chunk:federal_register_of_legislation:F2024C00356:front:0:p24
Version: federal_register_of_legislation:F2024C00356
Segment Type: other
Provision Reference: 
Character Range: 100421–103559

of the four elementary urban driving cycles of Part One of the Type I test. The Part One test is described in paragraph 6.1.1. of Annex 4a, and illustrated in figure 1 of the same annex. The low ambient temperature test lasting a total of 780 seconds shall be carried out without interruption and start at engine cranking.
              5.3.5.1.3. The low ambient temperature test shall be carried out at an ambient test temperature of 266 K (-7°C). Before the test is carried out, the test vehicles shall be conditioned in a uniform manner to ensure that the test results may be reproducible. The conditioning and other test procedures are carried out as described in Annex 8.
              5.3.5.1.4. During the test, the exhaust gases are diluted and a proportional sample collected. The exhaust gases of the vehicle tested are diluted, sampled and analysed, following the procedure described in Annex 8, and the total volume of the diluted exhaust is measured. The diluted exhaust gases are analysed for carbon monoxide and total hydrocarbons.
              5.3.5.2. Subject to the requirements in paragraphs 5.3.5.2.2. and 5.3.5.3. the test shall be performed three times. The resulting mass of carbon monoxide and hydrocarbon emission shall be less than the limits shown in the table below:
               Emission limit for the carbon monoxide and hydrocarbon tailpipe emissions after a cold start test

Test temperature 266 K (-7 °C)
Vehicle catgory                 Class  Mass of carbon monoxide  Mass of hydrocarbons (HC)
                                       (CO)                     L2 (g/km)
                                       L1 (g/km)
M                               -      15                       1.8
N1                              I      15                       1.8
II                              24     2.7
III                             30     3.2
N2                              -      30                       3.2

              5.3.5.2.1. Notwithstanding the requirements of paragraph 5.3.5.2., for each pollutant, not more than one of the three results obtained may exceed the limit prescribed by not more than 10 per cent, provided the arithmetical mean value of the three results is below the prescribed limit. Where the prescribed limits are exceeded for more than one pollutant, it is immaterial whether this occurs in the same test or in different tests.
              5.3.5.2.2. The number of tests prescribed in paragraph 5.3.5.2. may, at the request of the manufacturer, be increased to 10 if the arithmetical mean of the first three results is lower than 110 per cent of the limit. In this case, the requirement after testing is only that the arithmetical mean of all 10 results shall be less than the limit value.
              5.3.5.3. The number of tests prescribed in paragraph 5.3.5.2. may be reduced according to paragraphs 5.3.5.3.1. and 5.3.5.3.2.
              5.3.5.3.1. Only one test is performed if the result obtained for each pollutant of the first test is less than or equal to 0.70 L.
              5.3.5.3.2. If the requirement of paragraph 5.3.5.3.1. is not satisfied, only two