2021 Lexus NX 300h BaseFACTORY OEM SERVICE PROCEDURE

Removal [10/2014 - ]: Procedure

  1. DRAIN ENGINE COOLANT 

    Refer to PROCEDURE - Step 1

  2. REMOVE NO. 1 ENGINE COVER SUB-ASSEMBLY 

    Refer to PROCEDURE - Step 21 [10/2014 - 09/2016], or refer to PROCEDURE - Step 21 [09/2016 - 05/2019], or refer to PROCEDURE - Step 21 [05/2019 - ]

  3. REMOVE AIR CLEANER CAP AND HOSE 
    1. Disconnect the mass air flow meter sub-assembly connector.
      GTY520500Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Slide the clamp and disconnect the ventilation hose assembly from the cylinder head cover sub-assembly.
    3. Disconnect the purge valve connector.
    4. Slide the 2 clamps and disconnect the fuel vapor feed hose and No. 2 fuel vapor feed hose from the purge valve.
    5. Detach the 3 wire harness clamps.
    6. Detach the 2 clamps and remove the air cleaner cap sub-assembly from the air cleaner case.
      GTY511147Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. Lock the hose clamp and disconnect the air cleaner cap and hose from the throttle with motor body assembly.
      GTY511146Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. REMOVE THROTTLE WITH MOTOR BODY ASSEMBLY 
    1. Disconnect the fuel tube sub-assembly and No. 2 fuel vapor feed hose from the fuel hose clamp.
      GTY511149Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the throttle with motor body assembly connector.
      GTY497930Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 2 Water By-pass Hose
      *2 No. 3 Water By-pass Hose
    3. Slide the 2 clamps and disconnect the No. 2 water by-pass hose and No. 3 water by-pass hose from the throttle with motor body assembly.
    4. Remove the 4 bolts, fuel hose bracket and throttle with motor body assembly.
      GTY511245Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Remove the gasket from the intake manifold.
      GTY520523Courtesy 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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