2002 Lexus ES 300FACTORY OEM SERVICE PROCEDURE

Removal & Installation And Disassembly & Reassembly

  1. Drain coolant. See REPLACEMENT .
  2. Remove air cleaner cap with air cleaner hose.
    1. Disconnect the MAF meter connector.
    2. Disconnect the VSV connector for Canister Closed Valve (CCV) and the air hose.
    3. Disconnect the 4 vacuum hoses and the ventilation hose.
    4. Remove the air cleaner cap with the hose.
  3. Remove front suspension upper brace center (with front suspension brace upper center).
  4. Remove throttle body assembly.
    1. Disconnect the throttle position sensor connector.
    2. Disconnect the throttle control motor connector.
    3. Disconnect the 2 water bypass hoses.
      Fig 1: Disconnecting Water Bypass Hoses
      G01207042Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Remove the 4 bolts, throttle body and gasket.
    Fig 2: Removing Bolts, Throttle Body & Gasket
    G01207043Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. Remove E.F.I. throttle position sensor.
    1. Remove the 2 set screws and throttle position sensor.
  6. Install E.F.I. throttle position sensor.
    1. Check that the throttle valve is under the condition of the opener opening angle (about 6 degrees).
      Fig 3: Installing Throttle Position Sensor
      G01207044Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Install the sensor to the place where it is at 20-30° rotated to the right from the specified installation position.
      Fig 4: Installing Sensor To Specified Installation Position
      G01207045Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Gradually turn sensor counterclockwise until it touches the throttle valve shaft, and temporarily tighten the 2 set screws.
    4. Connect the throttle position sensor connector.
    5. Connect the hand-held tester or OBD II scan tool to the DLC3.
    6. Turn the ignition switch ON.
      NOTE: After turning the ignition switch ON, do not depress the accelerator pedal.
    7. While reading the value of the throttle valve opening percentage (THROTTLE POS) of the CURRENT DATA, turn the throttle position sensor slowly to left and right and set the sensor at the center value of the standard value, and then tighten the screws.

      Standard Throttle Valve Opening Percentage:  16.0-17.6 percent

      Fig 5: Connecting Throttle Position Sensor Connector
      G01207046Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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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.