Q. Explain the internal operation of this sensor and why the resistance changes?
A. In switch type TPS sensor there is a two contact points inside the throttle.There is a arm in the middle inside it, that makes the connections at two points. One point is for close postion and other for wide open (WOT) At Idle, throttle is closed and the resistance is infinite and when it starts open, the resistace at once jump to 0.1 ohms with any variations in between. In other way around, when it closing down from its fully open postion, the resistance jumps to infinite.
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