Circuit Operation

A 5-volt reference voltage is applied on the TPS (sub) power terminal (terminal No. 2) from the PCM (terminal No. 106). The ground terminal (terminal No. 4) is grounded with PCM (terminal No. 105). When the throttle valve shaft is turned from the idle position to the fully opened position, the resistor between TPS (sub) output terminal (terminal No. 3) and ground terminal will increase according to the rotation.