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.

2007 Lexus SC 430FACTORY OEM SERVICE PROCEDURE

On-Vehicle Inspection

CHECK THROTTLE BODY
1. Check the throttle control motor operating sounds.
  1. Turn the ignition switch ON.
  2. When depressing 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.
2. Check the throttle position sensor.
  1. Connect the intelligent tester to the DLC3.
    
    Fig 1: Connecting Intelligent Tester To DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Turn the ignition switch ON.
  3. Push the intelligent tester main switch ON.
  4. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / THROTTLE POS.
  5. Depress the accelerator pedal. When the throttle valve is fully opened, check that the value of "THROTTLE POS" is within the specification.
    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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