2008 Lexus RX 400h FWDFACTORY OEM SERVICE PROCEDURE

Throttle Body: Removal

  1. PRECAUTION 

    (See PRECAUTION )

  2. REMOVE ENGINE ROOM SIDE LH COVER NO.2  (See REMOVAL )
  3. REMOVE ENGINE ROOM COVER SIDE  (See REMOVAL )
  4. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
  5. DRAIN COOLANT (for Engine)  (See COOLANT (FOR ENGINE) )
  6. REMOVE FRONT WIPER ARM AND BLADE ASSEMBLY RH  (See REMOVAL )
  7. REMOVE FRONT WIPER ARM AND BLADE ASSEMBLY LH  (See REMOVAL )
  8. REMOVE COWL TOP VENTILATOR LOUVER SUB-ASSEMBLY  (See REMOVAL )
  9. REMOVE WINDSHIELD WIPER MOTOR AND LINK ASSEMBLY  (See REMOVAL )
  10. REMOVE COWL TOP PANEL SUB-ASSEMBLY OUTER  (See REMOVAL )
  11. REMOVE COOL AIR INTAKE DUCT SEAL  (See REMOVAL )
  12. REMOVE AIR CLEANER CAP W/ INLET 
    1. Disconnect the 4 clamps.
    2. Remove the 2 bolts and air cleaner cap w/ inlet.
    3. Remove the air cleaner element from the air cleaner case.
      Fig 1: Locating Air Cleaner Cap W/ Inlet And Bolts
      G05275776Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. REMOVE AIR CLEANER CASE W/ RESONATOR 
    1. Separate the ventilation hose No.2.
      Fig 2: Locating Ventilation Hose No.2
      G05200226Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the MAF meter connector.
    3. Disconnect the 2 wire harness clamps from the air cleaner.
      Fig 3: Locating Wire Harness Clamps
      G05200227Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Remove the 5 bolts from the air cleaner case w/ resonator.
      Fig 4: Locating Air Cleaner Case W/ Resonator And Bolts
      G05200228Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Remove the hose clamp, and separate the air cleaner hose No.1.
    6. Remove the air cleaner case w/ resonator.
      Fig 5: Locating Air Cleaner Hose No.1 Clamp
      G05200229Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  14. REMOVE THROTTLE BODY ASSEMBLY 
    1. Disconnect the throttle motor connector (A).
    2. Separate the water by-pass hose No.2 (B).
    3. Separate the water by-pass hose No.3 (C).
    4. Separate the fuel vapor feed hose (D).
      Fig 6: Locating Throttle Motor Connector And Water By-Pass Hose
      G05200230Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Remove the 4 bolts and the throttle body assembly.
      Fig 7: Locating Throttle Body Assembly And Bolts
      G05200231Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Remove the throttle body gasket from the intake air connector.
      Fig 8: Identifying Throttle Body Gasket
      G05200232Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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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