Toyota Celica, Corolla, ECHO & MR2 1999-05

Testing

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  1. Disconnect the engine wiring harness from the ECT sensor.
  2.  
  3. Connect an ohmmeter between the ECT sensor terminals.
  4.  



Click image to see an enlarged view

Fig. Inspect the resistance between the terminals of the engine coolant temperature sensor

  1. With the engine cold and the ignition switch in the OFF position, measure and note the ECT sensor resistance.
  2.  
  3. Connect the engine wiring harness to the sensor.
  4.  
  5. Start the engine and allow the engine to reach normal operating temperature.
  6.  
  7. Once the engine has reached normal operating temperature, turn the engine OFF .
  8.  
  9. Once again, disconnect the engine wiring harness from the ECT sensor.
  10.  
  11. Measure and note the ECT sensor resistance with the engine hot.
  12.  
  13. Compare the cold and hot ECT sensor resistance measurements with the accompanying chart.
  14.  



Click image to see an enlarged view

Fig. Submerge the sensor in water and check the testing with the Engine Coolant Temperature (ECT) sensor chart

  1. If readings do not approximate those in the chart, the sensor may be faulty.
  2.  

  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 terminal. The results should be between 2.32 to 2.59 kohms at 68 degrees F.
  8.  
  9. If checking the engine coolant temperature sensor in water, be careful not to allow water to intrude into the terminals. After checking, wipe up water on the engine coolant temperature sensor. If the result is not as specified, replace the engine coolant temperature sensor.
  10.  

1ZZ-FE VIN R



  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 terminals 1 and 2.
  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.  

2ZZ-FE VIN Y



  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 terminals 1 and 2.
  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.  

5S-FE VIN G



  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 terminals 1 and 2.
  8.  
  9. If the resistance is not as specified, replace the ECT sensor.

    Click image to see an enlarged view

    Fig. ECT testing

  10.  

 
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