2008 Lexus GX 470FACTORY OEM SERVICE PROCEDURE

On-Vehicle Inspection

  1. INSPECT THROTTLE BODY 
    1. Check for an operating sound.
      1. Turn the ignition switch to the ON position.
      2. When turning the accelerator pedal position sensor lever, listen to a running sound of the motor. Also, check that there is no friction sound.

        If operation is not as specified, check the throttle control motor (See INSPECTION  ), wiring and ECM.

        Fig 1: Inspecting Throttle Body
        G04968222Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Inspect the throttle position sensor.
      1. Connect Techstream to the DLC3.
      2. Turn the ignition switch ON (IG).
      3. Turn the tester on.
      4. Enter the following menus.

        Select: Powertrain/Engine and ECT/Data List/Throttle position.

      5. Depress the accelerator pedal. When the throttle valve is fully open, check that the Throttle position value is within the specification.

        Standard throttle valve opening percentage: 60% or more 

        If the result is not as specified, check the accelerator pedal position sensor (See REMOVAL  ), wiring and ECM.

        If the Techstream is not available, measure the voltage between the terminals (VTA1 - E2, VTA2 - E2) of the ECM connector (See TERMINALS OF ECM  ).

    3. Inspect the air assist system.
      1. Start the engine and check that the MIL does not light up.
      2. Warm up the engine to the normal operating temperature.
      3. Switch the A/C compressor from ON to OFF, and check the idle speed.

        Idle speed (Transmission in neutral): 

        650 to 750 rpm 

        NOTE: Perform this inspection while no electrical load is applied.
    4. Perform the driving test.
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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