Intake Air Control Valve Assembly (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.
With 7.9 in. Hg (26.7 kPa) of vacuum applied to actuator, ensure actuator rod moves. One minute after applying vacuum, check that actuator rod does not return. See Fig 1. If operation is not as specified, replace intake air control valve assembly.