2004 Toyota Avalon XLSFACTORY OEM SERVICE PROCEDURE

Throttle Body: Removal

  1. DRAIN ENGINE COOLANT 
  2. REMOVE V-BANK COVER 
    1. Using a 5 mm hexagon wrench, remove the 3 cap nuts.
    2. Loosen the V-bank cover fastener counterclockwise.

      HINT:

      At the time of installation, please refer to the following items.

      Press down the V-bank cover fastener.

    3. Remove the V-bank cover.
    Fig 1: Removing V-Bank Cover
    G02878947Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. REMOVE AIR CLEANER HOSE WITH RESONATOR 
    1. Disconnect the PCV hose.
    2. Disconnect the vacuum hose (from the VSV for the active engine control mount).
    3. Loosen the 3 hose clamps, and remove the air cleaner hose with the resonator.
  4. DISCONNECT ACCELERATOR CABLE AND THROTTLE CABLE 
    Fig 2: Removing Air Cleaner Hose With Resonator
    G02878948Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. REMOVE THROTTLE BODY 
    1. Remove the bolt holding the throttle body to the throttle body bracket.

      Torque: 19.5 N.m (200 kgf.cm, 14 ft.lbf) 

    2. Disconnect the throttle position sensor connector.
    3. Disconnect the IAC valve connector.
    4. Disconnect the wire clamp.
    5. Disconnect the brake booster vacuum hose.
      Fig 3: Removing Throttle Body
      G02878949Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Disconnect the water bypass hose (from the intake manifold).
    7. Disconnect the water bypass hose (from the water inlet housing).
    8. Disconnect the air assist hose.
    9. Disconnect the fuel vapor feed hose (from the emission control valve set).
    10. Disconnect the vacuum hose (from the No.1 ACIS VSV).
    11. Disconnect the vacuum hose (from the vacuum tank for the ACIS).
      Fig 4: Disconnecting Water Bypass Hose
      G02878950Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    12. Remove the 3 nuts, throttle body and gasket.

      HINT:

      At the time of installation, please refer to the following items. Place a new gasket on the air intake chamber.

      Torque: 29 N.m (300 kgf.cm, 22 ft.lbf) 

    Fig 5: Removing Throttle Body And Gasket
    G02878951Courtesy 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.

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