This standard specifies the limits and measurement methods for emissions from diesel vehicles under free acceleration and lugdown cycle, as well as the method and judgment basis of appearance inspection and OBD inspection of diesel vehicle. This standard is applicable to the inspection for new produced vehicle at end of production line, inspection for register vehicle, inspection for in-use vehicle. This standard also applies to other vehicles equipped with compression ignition engines. This standard does not apply to low-speed trucks and three-wheeled vehicles.