2004 Lexus LX 470FACTORY OEM SERVICE PROCEDURE

Engine Coolant Temperature (ECT) Sensor: Inspection

  1. DRAIN ENGINE COOLANT 
  2. REMOVE V-BANK COVER 
  3. REMOVE INTAKE AIR CONNECTOR 
  4. DISCONNECT THROTTLE BODY FROM INTAKE MANIFOLDS (See  REMOVAL  ) 
  5. REMOVE ECT SENSOR 
    1. Disconnect the ECT sensor connector.
    2. Remove the ECT sensor and the gasket.
    Fig 1: Removing ECT Sensor & Gasket
    G00920377Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. INSPECT ECT SENSOR 

    Using an ohmmeter, measure the resistance between the terminals.

    1. Resistance: Refer to  Fig 2 
      Fig 2: ECT Sensor Resistance/Temperature Graph
      G00920378Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If the resistance is not as specified, replace the ECT sensor.

  7. REINSTALL ECT SENSOR 
    1. Install a new gasket and the ECT sensor.
      1. Torque: 19.6 N.m (200 kgf.cm, 14 ft.lbf) 
    2. Connect the ECT sensor connector.
  8. REINSTALL THROTTLE BODY TO INTAKE MANIFOLDS 

    Install a new gasket and the throttle body with the 2 bolts and 2 nuts.

    1. Torque: 18 N.m (185 kgf.cm, 13 ft.lbf) 
  9. REINSTALL INTAKE AIR CONNECTOR 
  10. REFILL WITH ENGINE COOLANT (See  REPLACEMENT  ) 
  11. REINSTALL V-BANK COVER 
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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.