Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2008 Lexus GX 470FACTORY OEM SERVICE PROCEDURE

Intake Air Control System: Inspection

INSPECT INTAKE AIR CONTROL VALVE
1. With 39.9 kPa (300 mm Hg, 11.8 in.Hg) of vacuum applied to the actuator, check that the actuator rod moves. See Fig 1.
2. One minute after applying the vacuum, check that the actuator rod does not return. If operation is not as specified, replace the intake manifold.
  
  Fig 1: Identifying Intake Air Control Valve
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT VACUUM SWITCHING VALVE ASSEMBLY
1. Using an ohmmeter, check that there is continuity between each terminal.
  Resistance: 33 to 39 Ω at 20°C (68°F)
  
  If there is no continuity, replace the VSV.
  
  Fig 2: Checking That There Is Continuity Between Each Terminal
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Using an ohmmeter, check that there is no continuity between each terminal and the body.
  Resistance: 10 kΩ or higher
  
  If there is continuity, replace the VSV.
  
  Fig 3: Checking That There Is No Continuity Between Each Terminal & Body
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check that air flows from port E to the filter.
  
  Fig 4: Checking If Air Flows From Port E To Filter
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Apply battery voltage across the terminals.
5. Check that air flows from port E to port F. If operation is not as specified, replace the VSV.
  
  Fig 5: Checking If Air Flows From Port E To Port F
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Factory Service Tools

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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.