DTC P2121: Throttle / Pedal Position Sensor / Switch "D" Circuit Range / Performance [12/2013 - 11/2016]: Wiring Diagram

WARNING: This page is about a different car, the 2016 Toyota Highlander, 2015 Toyota Highlander, and 2014 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.