With regand to the vehicles equipped ignition engine with max total mass more than 3500kg or all-time 4-drive,the measuring method of dual idle speed shall be adopted.
The measurement can be done by a single-machine or by computer control.
Meet the requirement of GB18285-2005"Limits and Measurement Methods for Exhaust Pollutomts from Vehicles Equipped Igintion Eigine under Two-speed Idle conditions and simple Driving Mode Conditions".
