Throttle Control Motor (GS430, LS430 & SC430)
WARNING: This page is about a different car, the 2003 Lexus SC 430, 2003 Lexus LS 430, 2003 Lexus IS 300, 2003 Lexus GS 430, and 2003 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect control throttle motor 2-pin connector. Throttle control motor is mounted on side of throttle body. Measure resistance between terminals No. 1 (M+) and 2 (M-) at throttle control motor connector. See Fig 1. Resistance should be .3-100 ohms at 68°F (20°C). If resistance is not .3-100 ohms, replace throttle control motor.