When smoke or flames appear from the engine compartment of a heavy truck, what is the mandatory fire suppression procedure?

1. Pull over immediately, turn off the engine, isolate the main battery master switch (电源总开关), grab the fire extinguisher, and discharge into the grille/slits without opening the hood fully
2. Swing the hood wide open immediately to let the wind blow the fire out
3. Pour 5 liters of diesel fuel over the engine block to smother the electrical spark
4. Accelerate to 100 km/h to extinguish the flames with high-speed headwind airflow