2004 Lexus LS 430FACTORY OEM SERVICE PROCEDURE

Throttle Body ASSY: Replacement

  1. DRAIN ENGINE COOLANT (See  ENGINE COOLANT  ) 
  2. REMOVE V-BANK COVER 
    1. Remove the 2 nuts and V-bank cover.
  3. REMOVE AIR CLEANER INLET NO. 1 
  4. REMOVE INTAKE AIR CONNECTOR PIPE 
    1. Disconnect the air hose and ventilation hose.
    2. Remove the bolt.
    3. Loosen the 2 hose clamps and remove the intake air connector pipe.
  5. REMOVE THROTTLE BODY ASSY 
    1. Disconnect the water by-pass hose and water by-pass hose No. 7.
    2. Disconnect the connector.
    3. Remove the 2 bolts, 2 nuts, throttle body and gasket.
      Fig 1: Removing Throttle Body Assy
      G01049390Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. INSTALL THROTTLE BODY ASSY 
    1. Install a new gasket and the throttle body with the 2 bolts and 2 nuts.

      Torque: 18 N.m (185 kgf.cm, 13 ft.lbf) 

    2. Connect the water by-pass hose and water by-pass hose No. 7.
    3. Connect the connector.
      Fig 2: Installing Throttle Body Assy
      G01049391Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. INSTALL INTAKE AIR CONNECTOR PIPE 
    1. Install the intake air connector pipe with the bolt and 2 hose clamps.

      Torque: 

      4.0 N.m (41 kgf.cm, 35 in.lbf) for hose clamp 

      5.0 N.m (51 kgf.cm, 44 in.lbf) for bolt 

    2. Connect the air hose and ventilation hose.
  8. INSTALL AIR CLEANER INLET NO. 1 
  9. INSTALL V-BANK COVER 

    Torque: 5.0 N.m (51 kgf.cm, 44 in.lbf) 

  10. REFILL ENGINE COOLANT (See  ENGINE COOLANT  ) 
  11. CHECK FOR ENGINE COOLANT LEAKS (See  INSPECTION  ) 
  12. INSPECT THROTTLE BODY FUNCTION (See  ON-VEHICLE INSPECTION  ) 
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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