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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 474 (Automatic Transmission) >> Diagnosis And Testing >> Pinpoint Tests - OSC Equipped Vehicles >> 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 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to the TRANSMISSION VEHICLE HARNESS CONNECTOR  illustration preceding these pinpoint tests.
NOTE: Refer to the TRANSMISSION INTERNAL HARNESS CONNECTOR  illustration preceding these pinpoint tests.
  1. B1 ELECTRONIC DIAGNOSTICS 
    • 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 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 B2.
    2. No  : REPEAT procedure to enter PID. If vehicle did not enter PID, REFER to the INTRODUCTION - CNG, FLEX-FUEL & GASOLINE article for diagnosis of PCM.
  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? 
    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 the DIAGNOSIS BY SYMPTOM INDEX  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.

    2. No  : GO to B3.
  3. B3 ELECTRICAL SIGNAL CHECK 
    • Connect DVOM positive lead to +TFT at sensor terminal and negative lead to a good ground.
      Fig 1: Electrical Signal Check
      G03275387Courtesy of FORD MOTOR CO.
    • Is the voltage between 4.5 and 5.5? 
    1. Yes  : GO to B4.
    2. No  : CHECK for open or short circuit in vehicle harness, internal harness or a PCM concern.
  4. B4 CHECK RESISTANCE OF TFT SENSOR 
    • Disconnect: Transmission Harness.
    • Connect DVOM across +TFT and -TFT terminals at transmission connector.
      Fig 2: Checking Resistance Of TFT Sensor
      G03275388Courtesy of FORD MOTOR CO.
    • Record the resistance.
    • Resistance should be approximately in the following ranges:
      TRANSMISSION FLUID TEMPERATURE SENSOR SPECIFICATIONS

      °C °F Resistance (Ohms)
      -40 to -20 -40 to -4 967K - 284K
      -19 to -1 -3 - 31 284K - 100K
      0 - 20 32 - 68 100K - 37K
      21 - 40 69 - 104 37K - 16K
      41 - 70 105 - 158 16K - 5K
      71 - 90 159 - 194 5K - 2.7K
      91 - 110 195 - 230 2.7K - 1.5K
      111 - 130 231 - 266 1.5K - 0.8K
      131 - 150 267 - 302 0.8K - 0.54K
    • Is the resistance within range? 
    1. Yes  : REFER to the DIAGNOSIS BY SYMPTOM INDEX  in DIAGNOSIS BY SYMPTOM  for an overheating concern.
    2. No  : INSTALL a new internal harness (sensor is part of harness) and INSTALL the transmission fluid pan.
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