Document ID: chunk:federal_register_of_legislation:F2011C00805:reg:20:p12
Version: federal_register_of_legislation:F2011C00805
Segment Type: reg
Provision Reference: reg 20 (pt 12/23)
Character Range: 176598–179529

may be disengaged during the previous operation.

           2.4.   Tolerances

           2.4.1.  A tolerance of  2 km/h shall be allowed between the indicated speed and the theoretical speed during acceleration, during steady speed, and during deceleration when the vehicle's brakes are used. If the vehicle decelerates more rapidly without the use of the brakes, only the provisions of paragraph 6.5.3. below shall apply. Speed tolerances greater than those prescribed shall be accepted during phase changes provided that the tolerances are never exceeded for more than 0.5 s on any one occasion.

           2.4.2.   The time tolerances shall be ± 1.0 s.  The above tolerances shall apply equally at the beginning and at the end of each gear-changing period 1[/ for the urban cycle (Part One) and for the operations No. 3, 5 and 7 of the extra-]urban cycle (Part Two).

           2.4.3.  The speed and time tolerances shall be combined as indicated in Appendix 1 to this Annex.

           3.   VEHICLE AND FUEL

           3.1.   Test vehicle

           3.1.1.   The vehicle shall be presented in good mechanical condition. It shall have been runin and driven at least 3,000 km before the test.

           3.1.2.   The exhaust device shall not exhibit any leak likely to reduce the quantity of gas collected, which quantity shall be that emerging from the engine.

           3.1.3.   The tightness of the intake system may be checked to ensure that carburation is not affected by an accidental intake of air.

           3.1.4.   The settings of the engine and of the vehicle's controls shall be those prescribed by the manufacturer. This requirement also applies, in particular, to the settings for idling (rotation speed and carbon monoxide content of the exhaust gases), for the cold start device and for the exhaust gas cleaning system.

           3.1.5.   The vehicle to be tested, or an equivalent vehicle, shall be fitted, if necessary, with a device to permit the measurement of the characteristic parameters necessary for chassis dynamometer setting, in conformity with paragraph 4.1.1. of this Annex.

           3.1.6.   The technical service responsible for the tests may verify that the vehicle's performance conforms to that stated by the manufacturer, that it can be used for normal driving and, more particularly, that it is capable of starting when cold and when hot.

           3.2.   Fuel

             When testing a vehicle against the emission limit values given in row A of the table in paragraph 5.3.1.4. of this Regulation, the appropriate reference fuel must comply with the specifications given in paragraph 1. of Annex 10 or, in the case of gaseous reference fuels, either paragraph 1.1.1. or paragraph 1.2. of Annex 10a.

             When testing a vehicle against the emission limit values given in row B of the table in paragraph 5.3.1.4. of this Regulation, the appropriate reference