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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1346 (Automatic Transaxle - AISIN Aw21) >> Diagnosis And Testing >> Pinpoint Tests - OSC Equipped Vehicle >> Pinpoint Tests >> Pinpoint Test B: TFT Sensor

Pinpoint Test B: TFT Sensor

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to the Transaxle Vehicle Harness Connector illustrations within the TRANSAXLE CONNECTOR LAYOUTS  procedure.
  1. B1 ELECTRONIC DIAGNOSTICS 
    • Connect the scan tool.
    • Check to make sure the transaxle harness connector is fully seated, pins are fully engaged in connector and in good condition before proceeding.
    • Ignition ON.
    • Select DataLogger.
    • Select PID/TFT.
    • Does the vehicle enter DataLogger? 
  2. B2 TEMPERATURE SIGNAL CHECK 
    • Ignition ON.
    • Select DataLogger.
    • Select TFT PID.
    • Monitor the TFT PID. The temperature value should be within -55°C to 175°C (-67°F to 347°F).
    • Is the Transmission Fluid Temperature (TFT) 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 REFLASH 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 TCM  .
    • Inspect both sides of the TCM  for damaged or pushed-out pins, corrosion or damaged seals.
    • Measure the resistance between pins 7 and 8 at the transaxle bulkhead electrical connector. Refer to the following table below.

      Resistance 

      TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR RESISTANCE REFERENCE TABLE

      °C °F Resistance (Ohms)
      10 50 6.445
      25 77 3.5
      110 230 0.247
      Fig 1: Measuring Resistance Between Pins 7 & 8 At Transaxle Bulkhead Electrical Connector
      G06263908Courtesy 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 transaxle bulkhead electrical connector.
      Fig 2: Measuring Resistance Between Pin 7 & Ground At Transaxle Bulkhead Electrical Connector
      G06263909Courtesy of FORD MOTOR CO.
    • Measure the resistance between pin 8 and ground at the transaxle bulkhead electrical connector.
      Fig 3: Measuring Resistance Between Pin 8 & Ground At Transaxle Bulkhead Electrical Connector
      G06263910Courtesy of FORD MOTOR CO.
    • Record the resistances.
    • Are the resistances greater than 10,000 ohms? 
    • Yes:  INSTALL a new TCM  and REFLASH to the latest level calibration.
    • No:  INSTALL a new internal harness and TFT  assembly.
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