Subaru Car 1998-05

Testing

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Fig. Cutaway view of 1.8L engine thermometer-1997



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Fig. Cutaway view of 2.5L and 3.3L engines thermometer-1997

Subaru-s hand-held tester or an equivalent OBD-II scan tool must be used in order to check the operation of the coolant temperature sensor. For the detailed operation procedures, refer to the OBD-II General Scan Tool instruction manual.

Start the car and allow it to run to normal operating temperature. If the scan tool data shows the temperature less than 140°F (60°C), the sensor should be replaced.



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Fig. Schematic of thermometer and gauge-1997

  1. Refer to the illustration and connect the temperature gauge and sender in series.
  2.  
  3. Make sure that the gauge indicates C when the ignition switch is OFF .
  4.  
  5. Start the vehicle and record the resistance with a multimeter or equivalent at the sender.
  6.  
  7. At 122°F (50°C) the correct resistance should be between 133.9-178.9 ohms. At 176°F (80°C) the correct resistance should be between 47.5-56.8 ohms. At 212°F (100°C) the correct resistance should be between 26.2-29.3 ohms. And at 248°F (120°C) the correct resistance should be between 14.9-17.3 ohms.
  8.  

  1. Turn the ignition switch to OFF.
  2.  
  3. Disconnect the connector from the sensor.
  4.  
  5. Turn the ignition switch ON.
  6.  
  7. Using the Subaru scan tool, read the sensor signal data. If the measured value is less than -40 degrees F, replace the sensor.
  8.  

2.2L Engine



  1. Turn the ignition switch to OFF.
  2.  
  3. Measure the resistance of the harness between the coolant temperature sensor connector and engine ground (connector E8 terminal 2).
  4.  
  5. If resistance is less than 5 ohms, replace the sensor.
  6.  

  1. Turn the ignition switch to OFF.
  2.  
  3. Measure the resistance of the harness between the coolant temperature sensor connector and engine ground (connector E8 terminal 2).
  4.  
  5. If resistance is less than 5 ohms, replace the sensor.
  6.  

2.2L Engine



  1. Turn the ignition switch to OFF.
  2.  
  3. Measure the resistance of the harness between the coolant temperature sensor connector and engine ground (connector E8 terminal 2).
  4.  
  5. If resistance is less than 5 ohms, replace the sensor.
  6.  

Except 2.2L Engine



  1. Turn the ignition switch to OFF.
  2.  
  3. Disconnect the connector from the sensor.
  4.  
  5. Turn the ignition switch ON.
  6.  
  7. Using the Subaru scan tool, read the sensor signal data. If the measured value is less than -40 degrees F, replace the sensor.
  8.  

  1. Turn the ignition switch to OFF.
  2.  
  3. Disconnect the connector from the sensor.
  4.  
  5. Turn the ignition switch ON.
  6.  
  7. Using the Subaru scan tool, read the sensor signal data. If the measured value is less than -40 degrees F, replace the sensor.
  8.  

 
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