On-Vehicle Inspection

WARNING: This page is about a different car, the 2004 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT INTAKE AIR CONTROL FUNCTION

Fig 1: Identifying Intake Air Control Components Location
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Remove the V-bank cover.
2. Connect the hand-held tester (with CAN VIM) to the DLC3.
3. Perform the ACTIVE TEST, and then check that the actuator rod operates.
4. Start the engine.
5. (e) Check that the VSV for IAC valve is ON (seal) under these conditions.
  - Depressing the accelerator pedal to a throttle valve opening angle of 60 degrees.
  - Racing the engine above 4,700 RPM.
6. Check that the VSV for IAC valve is OFF (vent) under these conditions.
  - The engine is idling.
  - Releasing the accelerator pedal while under the 2 conditions in step ( e).
  If the result is not as specified, inspect the IAC valve, vacuum tank and VSV for normal operation. Replace malfunctioning parts as necessary.