Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:6600:p27
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 6600 (pt 27/28)
Character Range: 867320–870434

and after the road load determination procedure, the selected vehicle shall be weighed, including the test driver and equipment, to determine the arithmetic average mass . The mass of the vehicle shall be greater than or equal to the test mass of vehicle H or of vehicle L at the start of the road load determination procedure.
4.2.1.7. Test vehicle configuration
              The test vehicle configuration shall be recorded and shall be used for any subsequent coastdown testing.
4.2.1.8. Test vehicle condition
4.2.1.8.1. Run-in
              The test vehicle shall be suitably run-in for the purpose of the subsequent test for at least 10,000 but no more than 80,000 km.
              At the request of the manufacturer, a vehicle with a minimum of 3,000 km may be used.
4.2.1.8.2. Manufacturer's specifications
              The vehicle shall conform to the manufacturer's intended production vehicle specifications regarding tyre pressures described in paragraph 4.2.2.3. of this annex, wheel alignment described in paragraph 4.2.1.8.3. of this annex, ground clearance, vehicle height, drivetrain and wheel bearing lubricants, and brake adjustment to avoid unrepresentative parasitic drag.
4.2.1.8.3. Wheel alignment
              Toe and camber shall be set to the maximum deviation from the longitudinal axis of the vehicle in the range defined by the manufacturer. If a manufacturer prescribes values for toe and camber for the vehicle, these values shall be used. At the request of the manufacturer, values with higher deviations from the longitudinal axis of the vehicle than the prescribed values may be used. The prescribed values shall be the reference for all maintenance during the lifetime of the vehicle.
              Other adjustable wheel alignment parameters (such as caster) shall be set to the values recommended by the manufacturer. In the absence of recommended values, they shall be set to the arithmetic average of the range defined by the manufacturer.
           Such adjustable parameters and set values shall be recorded.
4.2.1.8.4. Closed panels
              During the road load determination, the engine compartment cover, luggage compartment cover, manually-operated movable panels and all windows shall be closed.
4.2.1.8.5. Vehicle coastdown mode
              If the determination of dynamometer settings cannot meet the criteria described in paragraphs 8.1.3. or 8.2.3. of this annex due to non-reproducible forces, the vehicle shall be equipped with a vehicle coastdown mode. The vehicle coastdown mode shall be approved and its use shall be recorded by the responsible authority.
              If a vehicle is equipped with a vehicle coastdown mode, it shall be engaged both during road load determination and on the chassis dynamometer.
              4.2.2. Tyres
              4.2.2.1. Tyre rolling resistance
              Tyre rolling resistances shall be measured according to Annex 6 to the 02 series of amendments to UN Regulation No. 117, or an internationally-accepted equivalent. The rolling resistance coefficients shall be aligned according to the respective