Protege 1999-2000

Transmission Fluid Temperature Sensor

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Operation



Specific to:

Mazda Protege 1998-2003

Mazda Protege5 2002-2003

The Transmission Fluid Temperature (TFT) Sensor is a Negative Temperature Coefficient (NTC) Thermistor that monitors the transmission/transaxle fluid (ATF) temperature. The TFT Sensor operates within a 5 volt DC reference range, and provides a linear input signal to the Powertrain Control Module (PCM) that is based upon the measured ATF temperature. The PCM uses data from the TFT Sensor to identify potential problems that may result from excessive fluid temperature such as excessive vehicle load and/or component failure, or an open or short in the TFT circuit.

Removal & Installation



Specific to:

Mazda Protege 1998-2003

Mazda Protege5 2002-2003

  1. Remove the oil pan.
  2.  
  3. Disconnect the TFT sensor connector.
  4.  
  5. Remove the TFT sensor.
  6.  
  7. Install a new TFT sensor.
  8.  
  9. Connect the TFT sensor connector.
  10.  
  11. Install the oil pan.

    Click image to see an enlarged view

    Fig. Showing the TFT sensor location

  12.  

Testing



Specific to:

Mazda Protege 1998-2003

Mazda Protege5 2002-2003

  1. Measure the resistance between the terminals E and H.
    1. If it is out of specifications, replace the TFT sensor.
    2.  
    3. Specifications should be:

      At 68°F (20°C): 236-324 k-ohms
       
      At 104°F (40°C): 14.7-17.9 k-ohms
       
      At 176°F (80°C): 3.61-4.15 k-ohms
       
      At 212°F (100°C): 1.96-2.24 k-ohms
       
      At 248°F (120°C): 1.13-1.28 k-ohms

      Click image to see an enlarged view

      Fig. Showing the location of the TFT sensor solenoid connector



      Click image to see an enlarged view

      Fig. Showing the TFT sensor connector pin arrangement for resistance checking

       

    4.  

  2.  

 
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