Circuit Description
WARNING: This page is about a different car, the 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
Throttle Position (TP) sensor is mounted to throttle body and it has 2 sensors to detect throttle opening angle. ECM determines current opening angle of throttle valve from signals input from terminals VTA1 and VTA2, and ECM control throttle motor to make throttle valve angle properly in response to driving condition.