2008 Lexus IS FFACTORY OEM SERVICE PROCEDURE

On-Vehicle Inspection

  1. CHECK THROTTLE BODY ASSEMBLYΒ 
    1. Check the throttle position sensor.
      1. Connect the Techstream to the DLC3.
      2. Turn the engine switch on (IG).
      3. Turn the Techstream ON.
      4. Enter the following menus. Powertrain / Engine / Data List / All Data / Throttle Sensor Position
      5. Start the engine
      6. Firmly depress the brake pedal with your left foot, and move the shift lever to N.
      7. Depress the accelerator pedal. When the throttle valve is fully opened, check that the value of "Throttle Sensor Position" is within the specification.

        Standard throttle valve opening percentage:Β 

        60% or moreΒ 

        HINT.

        When checking the standard throttle valve opening percentage, the shift lever should be in N

        If the percentage is less than 60%, replace the throttle body.

Factory Service Tools

Use the Manual With the Right Hardware

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When to See a Mechanic

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

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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