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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2010 (Automatic Transmission - Cd4E) >> Diagnostic Tests >> 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 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to the Transaxle Vehicle Harness Connector illustration Transaxle Connector Layouts .
  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? 
    1. YES  : Go to  B2.
    2. NO  : CARRY OUT checks. CLEAR the DTCs. RERUN Quick Test.
  2. B2 ELECTRONIC DIAGNOSTICS 
    • Key in OFF position.
    • Connect the diagnostic tool.
    • Key in ON position.
    • Select Diagnostic Data Link.
    • Select PCM.
    • Select PID/Data Monitor and Record.
    • Enter the following diagnostic mode on the diagnostic tool: PIDs; TFT, TFTV
    • Does the vehicle enter PID/Data Monitor and Record? 
    1. YES  : REMAIN in PID/Data Control. Go to  B3 .
    2. NO  : REPEAT procedure to enter PID. If vehicle did not enter PID, REFER to the Introduction - Gasoline Engines article.
  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? 
    1. 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.
    2. 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 C199
    • Use a mirror to inspect both ends of the connector for damaged or pushed-out pins, corrosion, loose wires and missing or damaged seals.
      • Fig 1: Checking Circuit For Voltage
      GF0024708Courtesy of FORD MOTOR CO.
    • Measure the voltage between C199 pin 1 and pin 2 of the transaxle vehicle harness connector.
    • Key in ON position.
    • Is the voltage between 4.75 and 5.25 volts? 
    1. YES  : Go to  B7.
    2. NO  : Go to  B5.
  5. B5 CHECK RESISTANCE OF TFT SENSOR 
    • Disconnect: Transaxle Connector C199
      • Fig 2: Checking TFT Sensor
      GF0024709Courtesy of FORD MOTOR CO.
    • Measure the resistance between C199 pin 1 and pin 2 of the transaxle vehicle harness connector.
    • 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? 
    1. YES  : REFER to Diagnosis By Symptom .
    2. NO  : Go to  B6.
  6. B6 CHECK CONTINUITY OF TFT AND SIGNAL RTN CIRCUITS 
    • Key in OFF position.
    • Disconnect: Transaxle Connector C199
    • Disconnect: PCM
      • Fig 3: Checking Circuit For Open
      GF0024710Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175T pin 29 and the transaxle C199 pin 1 harness side.
      • Fig 4: Checking Circuit For Open
      GF0024711Courtesy of FORD MOTOR CO.
    • For vehicles equipped with a 2.3L engine, measure the resistance between the PCM C175T pin 41 and the transaxle C199 pin 2 harness side.
      • Fig 5: Checking Circuit For Open
      GF0024711Courtesy of FORD MOTOR CO.
    • For vehicles equipped with 3.0L engine, measure the resistance between the PCM C175E pin 41 and the transaxle C199 pin 2 harness side.
    • Are both resistances less than 5 ohms? 
    1. YES  : Go to  B7.
    2. 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 
      Fig 6: Checking Circuits For Short Together
      GF0024712Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175T pin 29 and the PCM C175B pins 35 and 36.
      • Fig 7: Checking Circuits For Short Together
      GF0024713Courtesy of FORD MOTOR CO.
    • Measure the resistance between the PCM C175T pin 29 and the PCM C175B pins 47, 48 and 49.
      • Fig 8: Checking Circuits For Short Together
      GF0024714Courtesy of FORD MOTOR CO.
    • For vehicles equipped with 2.3L engines, measure the resistance between the PCM C175T pin 29 and the PCM C175T pin 41.
      • Fig 9: Checking Circuits For Short Together
      GF0024714Courtesy of FORD MOTOR CO.
    • For vehicles equipped with 3.0L engine, measure the resistance between the PCM C175T pin 29 and the PCM C175E pin 41.
    • Is each resistance greater than 10,000 ohms? 
    1. YES  : Go to  B8.
    2. 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
      • Fig 10: Checking Circuit For Short To Ground
      GF0024715Courtesy of FORD MOTOR CO.
    • Measure the resistance between BAT- jack (engine ground) and appropriate jack (-TFT and +TFT).
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : INSTALL a new solenoid assembly. RERUN On-Board Diagnostics test.
    2. NO  : RERUN On-Board Diagnostics test. INSTALL a new powertrain control module.
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