Editing Electronic throttle control (section)

==Operation==
{{Refimprove|section|date=July 2013}}
A typical ETC system consists of three major components: (i) an accelerator pedal module (ideally with two or more independent sensors), (ii) a throttle [[valve]] that can be opened and closed by an electric motor (sometimes referred to as an electric or electronic throttle body (ETB)), and (iii) a powertrain or engine control module (PCM or ECM).<ref>{{citation|last=Garrick|first=R.D.|title=Sensitivity of Contact Electronic Throttle Control Sensor to Control System Variation|publisher=Society of Automotive Engineers (SAE) Technical Paper|date=April 2006|url=http://delphi.com/pdf/techpapers/2006-01-0763.pdf|archive-url=https://web.archive.org/web/20131019105835/http://delphi.com/pdf/techpapers/2006-01-0763.pdf |archive-date=2013-10-19}}</ref> The ECM is a type of electronic control unit (ECU), which is an [[embedded system]] that employs software to determine the required throttle position by calculations from data measured by other sensors, including the accelerator pedal position sensors, engine speed sensor, vehicle speed sensor, and cruise control switches. The [[electric motor]] is then used to open the throttle valve to the desired angle via a [[Feedback|closed-loop]] control algorithm within the ECM.