Toyota Camry and Avalon 1997-2000

Coolant Temperature Switch (Sender)

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TESTING


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Fig. The coolant temperature sensor may be located in a coolant housing aside other sensors as shown



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Fig. Location of the Engine Coolant Temperature (ECT) switch-5S-FE engine

Using an ohmmeter, measure the resistance between the terminals. Refer to the appropriate chart for your engine. If the resistance is not as specified, replace the sender.



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Fig. Coolant temperature sender chart-gasoline engines



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Fig. Inspecting the coolant temperature sender for resistance



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Fig. To test the temperature switch/sender, you may remove it from the engine and warm it in a hot bowl of water

REMOVAL & INSTALLATION
  1. Turn the ignition key to the OFF position.
  2.  
  3. Locate the coolant temperature-sending unit on the engine.
  4.  
  5. Disconnect the sending unit electrical harness.
  6.  



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Fig. All ECT sensors have an electrical harness attached to it and a gasket on the bottom

  1. Drain the engine coolant below the level of the switch.
  2.  
  3. Unfasten and remove the sending unit from the engine. Discard the old gasket if equipped.
  4.  

To install:

  1. Coat the new sending unit with Teflon®tape or electrically conductive sealer. Place a new gasket on the sender.
  2.  
  3. Install the sending unit and tighten to 12-18 ft. lbs. (16-24 Nm).
  4.  
  5. Attach the sending unit's electrical connector.
  6.  
  7. Fill the engine with coolant.
  8.  
  9. Start the engine, allow it to reach operating temperature and check for leaks.
  10.  
  11. Check for proper sending unit operation.
  12.  

 
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