2004 Toyota Avalon XLSFACTORY OEM SERVICE PROCEDURE

On-Vehicle Inspection

  1. INSPECT THROTTLE BODY 

    Check that the throttle linkage moves smoothly.

    Fig 1: Inspecting Throttle Body
    G02878942Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT THROTTLE POSITION SENSOR 
    1. Disconnect the sensor connector.
    2. Disconnect the vacuum hose from the throttle body.
    3. Apply vacuum to the throttle opener.
    4. Using an ohmmeter, measure the resistance between each terminal.

      Resistance: 

      RESISTANCE CHECK

      Throttle valve condition Between terminals Resistance
      Fully closed VTA - E2 0.2 - 6.3Ω
      Fully open VTA - E2 2.0 - 10.2Ω
      - VC - E2 2.5 - 5.9Ω
      Fig 2: Inspecting Throttle Position Sensor
      G02878943Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Reconnect the vacuum hose to the throttle body.
  3. INSPECT THROTTLE OPENER 
    1. Allow the engine to warm up to normal operating temperature.
    2. Check idle speed.

      Idle speed: 650 +/- 50 rpm 

    3. Disconnect the vacuum hose from the throttle opener, and plug the hose end.
    4. Check the throttle opener setting speed.

      Throttle opener setting speed: 1,100 -1,700 rpm 

      If the throttle opener setting is not as specified, replace the throttle body.

      Fig 3: Disconnecting Vacuum Hose
      G02878944Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Stop the engine.
    6. Reconnect the vacuum hose to the throttle opener.
    7. Start the engine and check that the idle speed returns to the correct speed.
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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