Throttle Position (TP) Sensor
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 Lexus SC 430, 2002 Lexus RX 300, 2002 Lexus LX 470, 2002 Lexus LS 430, and 2002 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
Throttle Position (TP) sensor is located on side of throttle body. TP sensor delivers an input signal indicating throttle valve opening angle to Engine Control Module (ECM). Voltage signal to ECM increases as throttle opening increases. With throttle fully closed, ECM should receive a voltage signal of about .7 volt. With throttle wide open, voltage signal should be about 2.7-5.2 volts. ECM uses this input signal for adjusting air/fuel mixture, power increase correction and fuel cut-off operation.