Toyota Camry and Avalon 1997-2000

Electric Fan Switch

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TESTING
5S-FE Engines
  1. Disconnect the sending unit electrical harness.
  2.  
  3. Using an ohmmeter, check that there is no continuity between the terminals when the coolant temperature is above 199°F (93°) C.
  4.  



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Fig. Testing the water temperature switch for continuity

  1. Using an ohmmeter, check that there is continuity between the terminals when the coolant temperature is below 181°F (83°) C.
  2.  
  3. If resistance does not respond as specified, the sending unit is faulty.
  4.  

1MZ-FE Engine
NO. 1 SWITCH
  1. Disconnect the sending unit electrical harness.
  2.  
  3. Using an ohmmeter, check that there is no continuity between the terminals when the coolant temperature is above 208°F (98°) C.
  4.  



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Fig. No. 1 and No. 2 ECT switches



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Fig. Testing the No. 1 ECT switch-1MZ-FE engine

  1. Using an ohmmeter, check that there is continuity between the terminals when the coolant temperature is below 190°F (88°) C.
  2.  
  3. If resistance does not respond as specified, the sending unit is faulty.
  4.  

NO. 2 SWITCH
  1. Disconnect the sending unit electrical harness.
  2.  
  3. Using an ohmmeter, check that there is no continuity between the terminals when the coolant temperature is above 199°F (93°C.
  4.  



Click image to see an enlarged view

Fig. Testing the No. 2 ECT switch-1MZ-FE engine

  1. Using an ohmmeter, check that there is continuity between the terminals when the coolant temperature is below 181°F (83°C.
  2.  
  3. If resistance does not respond as specified, the sending unit is faulty.
  4.  

REMOVAL & INSTALLATION
  1. Turn the ignition key to the OFF position.
  2.  
  3. Drain the cooling system.
  4.  
  5. Disconnect the switch electrical wiring.
  6.  
  7. Remove the switch from the thermostat housing.
  8.  

To install:

  1. Coat the new sending unit with Teflon®tape or electrically conductive sealer.
  2.  
  3. Place a new O-ring on the end of the unit. Install the sending unit and tighten securely.
  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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