Throttle Position (TP) Sensor: Es300
WARNING: This page is about a different car, the 2002 Lexus RX 300 and 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect throttle position sensor connector. Measure resistance between terminals VC and E2. Resistance should be 1.2-3.2 k/ohms. See Fig 1.