2008 Lexus RX 400h FWDFACTORY OEM SERVICE PROCEDURE

Throttle Body: Installation

  1. INSTALL THROTTLE BODY ASSEMBLY 
    1. Install a new throttle body gasket to the intake air connector.
      Fig 1: Identifying Throttle Body Gasket
      G05200232Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Install the throttle body assembly with the 4 bolts.

      Torque: 11 N*m (112 kgf*cm, 8 ft.*lbf) 

      Fig 2: Locating Throttle Body Assembly And Bolts
      G05200231Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Connect the fuel vapor feed hose (A).
    4. Connect the water by-pass hose No.3 (B).
    5. Connect the water by-pass hose No.2 (C).
    6. Connect the throttle motor connector (D).
      Fig 3: Locating Throttle Body Assembly And Water By-Pass Hose
      G05200236Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSTALL AIR CLEANER CASE W/ RESONATOR 
    1. Install the air cleaner hose No.1 to the throttle body assembly with the hose clamp.
      Fig 4: Locating Air Cleaner Hose No.1 Clamp
      G05200237Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Install the air cleaner case w/ resonator with the 5 bolts.

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

      Fig 5: Locating Air Cleaner Case W/ Resonator And Bolts
      G05200228Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Connect the MAF meter connector.
    4. Connect the 2 wire harness clamps to the air cleaner.
      Fig 6: Locating Wire Harness Clamps
      G05200227Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Connect the ventilation hose No.2.
      Fig 7: Locating Ventilation Hose No.2
      G05200226Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSTALL AIR CLEANER CAP W/ INLET 
    1. Install a new air cleaner element to the air cleaner case.
    2. Install the air cleaner cap w/ inlet with the 4 clamps.
    3. Install the air cleaner cap w/ inlet with the 2 bolts.

      Torque: 7.0 N*m (71 kgf*cm, 62 in.*lbf) 

      Fig 8: Locating Air Cleaner Cap W/ Inlet And Bolts
      G05275776Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSTALL COOL AIR INTAKE DUCT SEAL  (See INSTALLATION )
  5. ADD COOLANT (for Engine)  (See COOLANT (FOR ENGINE) )
  6. INSPECT FOR COOLANT LEAK (for Engine)  (See COOLING SYSTEM )
  7. INSTALL COWL TOP PANEL SUB-ASSEMBLY OUTER  (See INSTALLATION )
  8. INSTALL WINDSHIELD WIPER MOTOR AND LINK ASSEMBLY  (See INSTALLATION )
  9. INSTALL COWL TOP VENTILATOR LOUVER SUB-ASSEMBLY 
  10. INSTALL FRONT WIPER ARM AND BLADE ASSEMBLY LH  (See INSTALLATION )
  11. INSTALL FRONT WIPER ARM AND BLADE ASSEMBLY RH  (See INSTALLATION )
  12. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL 
  13. INSTALL ENGINE ROOM COVER SIDE  (See INSTALLATION )
  14. INSTALL ENGINE ROOM SIDE LH COVER NO.2  (See INSTALLATION )
  15. PERFORM INITIALIZATION 

    Some system need initialization when reconnecting the battery cable. (See INITIALIZATION )

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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