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.

2006 Lexus GS 430FACTORY OEM SERVICE PROCEDURE

On-Vehicle Inspection

CHECK THROTTLE BODY
1. Check the throttle control motor operating sound.
  1. Turn the engine switch on (IG).
  2. When pressing the accelerator pedal, check the operating sound of the running motor. Make sure that no friction noises emit from the motor. If friction noise exists, replace the throttle body.
    
    Fig 1: Identifying Throttle Control Motor
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the throttle position sensor.
  1. Connect the intelligent tester to the DLC3.
  2. Turn the engine switch on (IG).
  3. Push the intelligent tester main switch ON.
  4. Enter the following menus: Powertrain / Engine and ETC / Data List / Throttle Sensor Position.
  5. Depress the accelerator pedal. When the throttle valve is fully opened, check that the value of the "Throttle Sensor Position" is within the specification.
    
    Fig 2: Identifying Intelligent Tester To DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Standard throttle valve opening percentage:
    
    60% or more
    
    NOTE: When checking the standard throttle valve opening percentage, the shift lever should be in the N position.
    
    If the percentage is less than 60%, replace the throttle body.

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.

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