Circuit Operation

A 5-volt power supply is applied to the throttle position sensor power terminal (terminal 3) from the ECM (terminal 81 - M/T) or PCM (terminal 46 - A/T).
The ground terminal (terminal 2) is grounded with ECM (terminal 92 - M/T) or PCM (terminal 57 - A/T).
When the throttle valve shaft is turned from the idle position to the fully opened position, the resistance between the throttle position sensor output terminal (terminal 3) and ground terminal will increase according to the rotation.