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Pinpoint Test B: Transmission Fluid Temperature (TFT) Sensor

WARNING: This page is about a different car, the 2005 Mercury Montego and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
  1. B1 ELECTRONIC DIAGNOSTICS 
    • Connect the scan tool.
    • Check to make sure the transmission harness connector is fully seated, pins are fully engaged in connector and in good condition before proceeding.
    • Key in ON position.
    • Select Diagnostic Data Link.
    • Select TCM.
    • Select PID/Transmission Fluid Temp (TFT).
    • Enter the following diagnostic mode on the scan tool: PIDs; TFT.
    • Does the vehicle enter PID/Transmission Fluid Temp (TFT)? 
    • Yes  : GO to B2.
    • No  : REPEAT procedure to enter PID. If vehicle did not enter PID, REFER to the INTRODUCTION - GASOLINE article .
  2. B2 TEMPERATURE SIGNAL CHECK 
    • Key in ON position.
    • Select Diagnostic Data Link.
    • Select TCM.
    • Select PID/Transmission Fluid Temp.
    • Enter the following diagnostic mode on the scan tool: PIDs; TFT.
    • Monitor the TFT PID. The temperature value should be within -55°C to 175°C (-65°F to 347°F).
    • Is the TFT temperature within specified range? 
    • Yes  : GO to B3.
    • No  : GO to  B4
  3. B3 WARM-UP/COOL-DOWN CYCLE 
    • While monitoring the TFT PIDs, carry out the following test: If transmission is cold, run transmission to warm it up. If transmission is warm, allow transmission to cool down.
    • Do the TFT PIDs increase as the transmission is warmed up, decrease as the transmission is cooled and does the TFT stay within the specified range? 
    • Yes  : Install a new transmission control module (TCM) and re-flash to the latest level calibration. CLEAR all DTCs. ROAD TEST to verify concern is not present. Concern could be intermittent. If concern is still present or reappears, GO to B4.
    • No  : GO to B4.
  4. B4 SIGNAL RESISTANCE 
    • Remove the transmission control module (TCM).
    • Inspect both sides of the transmission control module for damaged or pushed out pins, corrosion or damaged seals.
    • Measure the resistance between pins 7 and 8 at the transmission bulkhead electrical connector. Refer to the following table TRANSMISSION FLUID TEMPERATURE SENSOR RESISTANCE .
      TRANSMISSION FLUID TEMPERATURE SENSOR RESISTANCE

      °c °F Resistance (Ohms)
      10 50 6.445
      25 77 3.5
      110 230 0.247
      Fig 1: Measuring Resistance Between Pins 7 And 8 At Transmission Bulkhead Electrical Connector
      G03991659Courtesy of FORD MOTOR CO.
    • Record the resistance.
    • Is the resistance within range? 
    • Yes  : GO to B5.
    • No  : INSTALL a new internal harness and TFT assembly.
  5. B5 SHORT TO GROUND 
    • Measure the resistance between pin 7 and ground at the transmission bulkhead electrical connector.
      Fig 2: Measuring Resistance Between Pin 7 And Ground
      G03991660Courtesy of FORD MOTOR CO.
    • Measure the resistance between pin 8 and ground at the transmission bulkhead electrical connector.
      Fig 3: Measuring Resistance Between Pin 8 And Ground
      G03991661Courtesy of FORD MOTOR CO.
    • Record the resistances.
    • Are the resistances greater than 10,000 ohms? 
    • Yes  : INSTALL a new transmission control module (TCM) and re-flash to the latest level calibration.
    • No  : INSTALL a new internal harness and TFT assembly.
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