WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.

CHECK INTAKE AIR CONTROL FUNCTION
1. Connect the intelligent tester or Techstream to the DLC3
2. Turn the power switch ON (IG)
3. Push the tester main switch ON.
4. Enter the following menus.
  1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / INTAKE CTL VSV1.
  2. Techstream - Select Powertrain / Engine / Active Test / Activate the VSV for Intake Control.
5. When power is supplied, check that the actuator rod operates.
  
  Fig 1: Identifying Actuator Rod
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT AIR CLEANER FILTER ELEMENT
1. Check that the air cleaners are not excessively dirty. If either air cleaner is excessively dirty, replace both air cleaners.
CHECK AIR INDUCTION SYSTEM
HINT

The illustration shows the areas that may draw in secondary air, which could lead to idling problems.
1. Check that the hoses, gaskets and O-rings are installed correctly.
2. Check for cracks, etc. in the hoses, gaskets and O-rings.
  
  Fig 2: Checking Air Induction System
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

On-Vehicle Inspection

Use the Manual With the Right Hardware

When to See a Mechanic