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Pinpoint Test B: Transmission Fluid Temperature (TFT) Sensor

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to Figure preceding these pinpoint tests.
  1. B1 ELECTRONIC DIAGNOSTICS 
    • Key in OFF position.
    • Select PARK.
    • Check to make sure the transmission harness connector is fully seated, terminals are fully engaged in connector and in good condition before proceeding.
    • Connect the scan tool.
    • Key in ON position.
    • Select Diagnostic Data Link.
    • Select PCM.
    • Select PID/Data Monitor and Record.
    • Enter the following diagnostic mode on the scan tool: PIDs; TFT, TFTV.
    • Does the vehicle enter PID/Data Monitor and Record? 
    • Yes  : REMAIN in PID/Data Control. GO to  B2.
    • No  : REPEAT procedure to enter PID. If vehicle did not enter PID, See INTRODUCTION - GASOLINE article for diagnosis of PCM and NGS.
  2. B2 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 or decrease as the transmission is cooled or does the TFT or TFTV drop in and out of range? 
    • Yes  : If the TFT PIDs increase as the transmission is warmed or decrease as the transmission is cooled, CLEAR all DTCs. ROAD TEST to verify if concern is still present. If concern is still present, REFER to DIAGNOSIS BY SYMPTOM  in this article to diagnose transmission overheating. If the TFT or TFTV drop in and out of range, INSPECT for intermittent concern in the internal/external harness, sensor or connector.
    • No  : GO to  B3.
  3. B3 ELECTRICAL SIGNAL CHECK 
    • Disconnect: Transmission Harness Connector.
    • Visually inspect all wires and connectors for damage.
    • Measure voltage between pin 2 harness side and ground.
      Fig 1: Measuring Voltage Between Pin 2 Harness Side And Ground
      G03948520Courtesy of FORD MOTOR CO.
    • Is the voltage between 4.5 and 5.0 volts? 
    • Yes  : GO to  B4.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  4. B4 CHECK RESISTANCE OF TFT SENSOR 
    • Measure resistance between pin 2 and 12 at solenoid body connector.
      Fig 2: Measuring Resistance Between Pin 2 And 12 At Solenoid Body Connector
      G03948521Courtesy of FORD MOTOR CO.
    • Record the resistance.
    • Resistance should be approximately in the following ranges:
      °C °F Resistance (Ohms)
      -40 to -20 -40 to -4 967 K - 284 K
      -19 to -1 -3 - 31 284 K- 100 K
      0-20 32-68 100 K - 37 K
      21 - 40 69 - 104 37 K - 16 K
      41 - 70 105 - 158 16 K - 5 K
      71 - 90 159 - 194 5 K - 2.7 K
      91 - 110 195 -230 2.7 K - 1.5 K
      111 - 130 231 - 266 1.5 K - 0.8 K
      131 - 150 267 - 302 0.8 K - 0.54 K
    • Is the resistance in the range? 
    • Yes  : REFER to DIAGNOSIS BY SYMPTOM  in this article to diagnose an overheating concern.
    • No  : INSTALL a new solenoid body assembly.
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