Toyota Celica 1994-1998 Repair Guide

Coolant Temperature Sensor

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TESTING



See Figure 1

Using an ohmmeter, measure the resistance between the terminals.

  1. Check that there is no continuity between the terminals when the sensor is above 199 °F (93 °C). Check that there is continuity between terminals when the temperature is below 181 ° (83 °C).
  2.  
  3. If the continuity is not within specifications, replace the switch.
  4.  



Click image to see an enlarged view

Fig. Fig. 1: Inspecting the continuity of the coolant sensor

REMOVAL & INSTALLATION



See Figure 2

  1. Locate the coolant temperature sending unit on the engine.
  2.  
  3. Disconnect the sending unit electrical wiring.
  4.  



Click image to see an enlarged view

Fig. Fig. 2: Disconnect the engine coolant temperature sensor wiring

  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 18 ft. lbs. (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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