Lexus RX300, 330 3 2000-06

Coolant Temperature Sensor

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  1. Drain engine coolant.
  2.  
  3. Disconnect the ECT sensor connector.
  4.  
  5. Using a 19 mm deep socket wrench, remove the ECT sensor and gasket.
  6.  
  7. Using an ohmmeter, measure the resistance between the terminals.
  8.  
  9. If the resistance is not as specified, replace the ECT sensor.

    Click image to see an enlarged view

    Fig. ECT testing

  10.  

To install:

  1. Install a new gasket to the ECT sensor.
  2.  
  3. Using a 19 mm deep socket, install the ECT sensor. Tighten to 14 ft. lbs. (20 Nm).
  4.  
  5. Connect the ECT sensor connector.
  6.  
  7. Refill with engine coolant.
  8.  

  1. Drain engine coolant.
  2.  
  3. Disconnect the ECT sensor connector.
  4.  
  5. Using a 19 mm deep socket wrench, remove the ECT sensor and gasket.
  6.  
  7. Using an ohmmeter, measure the resistance between the terminals.
  8.  
  9. If the resistance is not as specified, replace the ECT sensor.

    Click image to see an enlarged view

    Fig. ECT testing

  10.  

To install:

  1. Install a new gasket to the ECT sensor.
  2.  
  3. Using a 19 mm deep socket, install the ECT sensor. Tighten to 14 ft. lbs. (20 Nm).
  4.  
  5. Connect the ECT sensor connector.
  6.  
  7. Refill with engine coolant.
  8.  

 
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