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Throttle Body: Inspection

  1. INSPECT THROTTLE BODY ASSEMBLY 
    1. Check the throttle body.
      1. Check that the throttle valve shaft is not rickety.
      2. Check that all ports are not clogged.
      3. Check that the throttle valve opens and closes smoothly.
      4. Check that there is no clearance between the throttle stop screw and throttle lever at the throttle valve closed position.
        NOTE: Do not touch the throttle stop screw.
        Fig 1: Locating Throttle Lever And Throttle Stop Screw
        G04460897Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT E.F.I. THROTTLE POSITION SENSOR 
    1. Check inspection.
      1. Disconnect the throttle position sensor connector.
      2. Using an ohmmeter, measure the resistance between terminals VC and E2.

        Resistance: 2.5 to 6.0 k 

      3. Check the resistance variation between terminals VTA and E2.

        Variation of resistance: The resistance value increases in proportion to the throttle lever opening value. 

        Fig 2: Inspecting E.F.I. Throttle Position Sensor
        G04460898Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT:

        RESISTANCE SPECIFIED CONDITIONS

        Throttle valve Movement Resistance
        Fully close 0.2 to 5.7 k
        Fully open 2.0 to 10.2 k

        If the result is not as specified, replace the throttle position sensor.

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