2009 Lexus GS 450hFACTORY OEM SERVICE PROCEDURE

Throttle Body: Removal: Removal

  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
    WARNING:

    Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.

  2. REMOVE COOL AIR INTAKE DUCT SEAL  See step  5
  3. DRAIN ENGINE COOLANT  . Refer to REPLACEMENT - Step 5
  4. REMOVE ENGINE ROOM SIDE COVER RH  See step  7
  5. REMOVE V-BANK COVER  See step  8
  6. REMOVE NO. 1 AIR CLEANER INLET  . Refer to REMOVAL - Step 2
  7. DISCONNECT NO. 2 VENTILATION HOSE 
    1. Disconnect the ventilation hose from the cylinder head.
      Fig 1: Connecting Ventilation Hose To Cylinder Head Cover With Clamp
      GTY104804Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. REMOVE AIR CLEANER CAP WITH AIR CLEANER HOSE 
    1. Disconnect the MAF meter connector.
      Fig 2: Locating MAF Meter Connector
      GTY132841Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the clamp from the air cleaner.
    3. Disconnect the purge line hose.
      Fig 3: Locating Purge Line Hose
      GTY140427Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Disconnect the 4 clamps.
      Fig 4: Locating Air Cleaner Cap With Air Cleaner Hose And Clamp
      GTY146892Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Remove the hose clamp and air cleaner cap with air cleaner hose.
  9. REMOVE THROTTLE BODY 
    1. Disconnect the throttle motor connector.
      Fig 5: Identifying Throttle Body Bolts
      GTY141755Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the 4 bolts and disconnect the throttle body from the intake air surge tank.
    3. Disconnect the 2 water by-pass hoses from the throttle body.
      Fig 6: Locating Water By-Pass Hoses
      GTY101111Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Remove the throttle body and gasket.
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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