Inspect Intake Air Control Valve Operation

WARNING: This page is about a different car, the 2007 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.

Start the engine.
While the engine is idling, check that the actuator rod moves. See Fig 1.

Fig 1: Checking Actuator Rod Movement
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Disconnect the VSV connector, and check that the actuator rod returns. See Fig 2. If operation is not as specified, inspect the intake air control valve, VSV and ECM.

Fig 2: Checking Actuator Rod Return Movement