On-Vehicle Inspection

WARNING: This page is about a different car, the 2008 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT INTAKE AIR CONTROL VALVE OPERATION
1. Start the engine.
2. While the engine is idling, check that the actuator rod moves as shown in the illustration.
  
  Fig 1: Inspecting Intake Air Control Valve Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Disconnect the VSV connector, and check that the actuator rod returns.
  If the operation is not as specified, inspect the intake air control valve, VSV and ECM.
CHECK AIR INDUCTION SYSTEM

Fig 3: Air Induction System Diagram
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The illustration shows the areas that may draw in secondary air, which could lead to idling problems.
1. Check that the hoses are installed correctly.
2. Check for cracks, etc. in the hoses.