A vehicle leaf spring suspension having a low spring rate is disclosed. A transmission rotational speed in an initial transmission stage is determined. In one implementation, for example, such detection is made by detecting the audible sound of a lighter, via a smoke detector, andor so on. That is, when the sacrificial material wears away and exposes the conductive sacrificial material in the line, that conductive material may begin to experience faults. A tape attaches to the nozzle plate and covers each of the nozzle holes.