Almost all the cars now use an Electronic Throttle Body for Controlling airflow into the engine. In order to make the system Fail-safe, manufacturers use two Potentiometers for the throttle position sensor feedback. My doubt is regarding the method used for tapping output from both the potentiometers and it has been troubling me for the past week. 1. In BOSCH Throttle body, output voltage of one potentiometer Increase and the other decrease for an increasing input from 0-100% 2.In Toyota Throttle body, Output Voltage of both the Potentiometer increase (the Voltage and the gradient are different) for an increasing input from 0-100%. Refer Picture for working of above methods. What are the advantages & disadvantages of both the methods?