Circuit Operation

When the throttle valve shaft rotates from the idle position to the fully opened position, the resistance between the accelerator pedal position sensor output terminal (terminal 6) and ground terminal (terminal 7) will increase according to the rotation.
With the ignition switch in the "ON" position. Voltage at pin 5 increases from approximately 0.7 volt at closed throttle, to approximately 5 volts at wide open throttle.