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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1459 (Automatic Transmission - Cd4E) >> Diagnosis And Testing >> Pinpoint Tests - Non OSC Equipped Vehicle >> Pinpoint Tests >> Pinpoint Test B: Transmission Fluid Temperature (TFT) Sensor

Pinpoint Test B: Transmission Fluid Temperature (TFT) Sensor

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. 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 
    • Make sure the transaxle vehicle harness connector is fully seated, terminals are fully engaged in connector and in good condition before proceeding.
    • Have the items been checked? 

    Yes:  GO to  B2.

    No:  CARRY OUT checks. CLEAR the DTCs. RERUN Quick Test.

  2. B2 ELECTRONIC DIAGNOSTICS 
    • Key in OFF position.
    • 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  B3.

    No:  REPEAT procedure to enter PID. If vehicle did not enter PID, REFER to INTRODUCTION - GASOLINE .

  3. B3 CHECK ELECTRICAL SIGNAL OPERATION 
    • 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 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  to diagnose transmission overheating. If the TFT or TFTV is in and out of range, INSPECT for intermittent concern in the internal/external harness, sensor or connector.

    No:  GO to  B4.

  4. B4 CHECK ELECTRICAL SIGNAL OPERATION 
    CAUTION: Do not pry on the connector. This will damage the connector and can result in a transaxle concern. Press button and pull up on the transaxle vehicle harness connector.
    • Key in OFF position.
    • Disconnect: Transaxle Connector.
    • Use a mirror to inspect both ends of the connector for damaged or pushed-out pins, corrosion, loose wires and missing or damaged seals.
    • Measure the voltage between pin 3 and pin 2 of the transaxle vehicle harness connector.
      Fig 1: Checking Electrical Signal Operation
      G04619784Courtesy of FORD MOTOR CO.
    • Key in ON position.
    • Is the voltage between 4.75 and 5.25 volts? 

    Yes:  GO to  B7.

    No:  GO to  B5.

  5. B5 CHECK RESISTANCE OF TFT SENSOR 
    • Disconnect: Transaxle Connector.
    • Measure the resistance between pin 3 and pin 2 of the transaxle vehicle harness connector.
      Fig 2: Checking Resistance Of TFT Sensor
      G04619785Courtesy of FORD MOTOR CO.
    • Record the resistance.
    • The resistance should be approximately within the following range.
      TRANSMISSION FLUID TEMPERATURE

      °C °F Resistance (Ohms)
      -40° to -20° -40° to -4° 967 - 284
      -19° to -1° -3° to 31° 284 - 100
      0° - 20° 32° - 68° 100 - 37
      21° - 40° 69° - 104° 37 - 16
      41° - 70° 105° - 158° 16 - 5
      71° - 90° 159° - 194° 5 - 2.7
      91° - 110° 159° - 230° 2.7 - 1.5
      111° - 130° 231° - 266° 1.5 - 0.8
      131° - 150° 267° - 302° 0.8 - 0.54
    • Is the resistance within range? 

    Yes:  REFER to DIAGNOSIS BY SYMPTOM .

    No:  GO to  B6.

  6. B6 CHECK CONTINUITY OF TFT AND SIGNAL RTN CIRCUITS 
    • Key in OFF position.
    • Disconnect: Transaxle Connector.
    • Disconnect: PCM.
    • Measure the resistance between the PCM pin T29 and the transaxle connector signal pin 3 harness side.
      Fig 3: Checking Continuity Of TFT & Signal RTN Circuits (1 Of 2)
      G04619786Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM pin T41 and the transaxle connector signal pin 2 harness side.
      Fig 4: Checking Continuity Of TFT & Signal RTN Circuits (2 Of 2)
      G04619787Courtesy of FORD MOTOR CO.
    • Are both resistances less than 5 ohms? 

    Yes:  GO to  B7.

    No:  REPAIR open circuit(s). RECONNECT all components. CLEAR the DTCs. RERUN Quick Test.

  7. B7 CHECK TFT CIRCUIT FOR SHORT TO VPWR AND GROUND 
    • Measure the resistance between the PCM pin T29 and the PCM pins C35 and C36.
      Fig 5: Checking TFT Circuit For Short To VPWR & Ground (1 Of 3)
      G04619788Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM pin T29 and the PCM pins C47, C48 and C49.
      Fig 6: Checking TFT Circuit For Short To VPWR & Ground (2 Of 3)
      G04619789Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM pin T29 and the PCM pin T41.
      Fig 7: Checking TFT Circuit For Short To VPWR & Ground (3 Of 3)
      G04619790Courtesy of FORD MOTOR CO.
    • Is each resistance greater than 10,000 ohms? 

    Yes:  GO to  B8.

    No:  REPAIR shorted circuit(s). RECONNECT all components. CLEAR the DTCs. RERUN Quick Test.

  8. B8 CHECK TFT SENSOR/HARNESS FOR SHORT TO GROUND 
    • Disconnect: Transaxle Connector.
    • Connect: Transmission Tester.
    • Measure the resistance between BAT-jack (engine ground) and appropriate jack (-TFT and +TFT).
      Fig 8: Checking TFT Sensor/Harness For Short To Ground
      G04619791Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 

    Yes:  INSTALL a new solenoid assembly. RERUN On-Board Diagnostics test.

    No:  RERUN On-Board Diagnostics test. INSTALL a new powertrain control module.

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