Division 7.3.2 F1
If the determination of dynamometer settings cannot meet the criteria described in paragraph 8.1.3. due to non-reproducible forces, the vehicle shall be equipped with a vehicle coastdown mode. The vehicle coastdown mode shall be approved by the approval authority and the use of a vehicle coastdown mode shall be included in all relevant test reports.
If a vehicle is equipped with a vehicle coastdown mode, it shall be engaged both during road load determination and on the chassis dynamometer.