2006 Lexus IS 350FACTORY OEM SERVICE PROCEDURE

Throttle Body: Installation

  1. INSTALL THROTTLE BODY 
    1. Install a new gasket to the intake air surge tank.

      HINT:

      Align the protrusion of the gasket on the intake air surge tank.

      Fig 1: Installing Gasket To Intake Air Surge Tank
      G04054962Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the 2 water by-pass hoses to the throttle body.
      Fig 2: Connecting Water By-Pass Hoses To Throttle Body
      G04054963Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Install the throttle body with the 4 bolts.

      Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) 

    4. Connect the throttle motor connector.
      Fig 3: Identifying Throttle Body
      G04054964Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSTALL AIR CLEANER CAP WITH AIR CLEANER HOSE 
    1. Install the air cleaner cap with air cleaner hose assembly with the 4 clamps and hose clamp.

      Torque: 4.0 N*m (41 kgf*cm, 35 in.*lbf) 

      HINT:

      Fit the protrusion on the air cleaner hose into the hole of the hose clamp on the throttle valve side.

      Fig 4: Identifying Air Cleaner Cap With Air Cleaner Hose Assembly
      G04054965Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Install the VSV hose to the air cleaner hose.
      Fig 5: Installing VSV Hose To Air Cleaner Hose
      G04054966Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Connect the MAF meter connector and clamp to the air cleaner.
      Fig 6: Identifying MAF Meter Connector
      G04054967Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. CONNECT NO. 2 VENTILATION HOSE 
    1. Connect the ventilation hose to the cylinder head cover with the clamp.
      Fig 7: Connecting Ventilation Hose To Cylinder Head Cover With Clamp
      G04054968Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. ADD ENGINE COOLANT (See  COOLANT  ) 
  5. CHECK FOR ENGINE COOLANT LEAKS (See  COOLANT  ) 
  6. CHECK FUNCTION OF THROTTLE BODY (See  ON-VEHICLE INSPECTION   ) 
  7. INSTALL V-BANK COVER SUB-ASSEMBLY (See  INSTALLATION  ) 
  8. INSTALL ENGINE ROOM SIDE COVER RH (See  INSTALLATION  ) 
  9. INSTALL COOL AIR INTAKE DUCT SEAL (See  INSTALLATION  ) 
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.