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Pinpoint Test G: TFT Sensor

WARNING: This page is about a different car, the 2008 Ford Pickup, 2008 Ford F550 Super Duty, 2008 Ford F450 Super Duty, and 2008 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to the Transmission Vehicle Harness Connector illustration in Transmission Connector Layouts .
NOTE: Refer to the Transmission Internal Harness Connector illustration in Transmission Connector Layouts .
NOTE: Read and record all DTCs.
NOTE: Use the PID Chart for available diagnostic PIDs. Refer to Diagnostic Parameters Identification (PID) Chart .
  1. G1 ELECTRONIC DIAGNOSTICS 
    • Select PARK.
    • Key in OFF position.
    • Check to make sure the transmission vehicle harness C1385 is fully seated, terminals are fully engaged in the connector and are in good condition before proceeding.
    • Connect the diagnostic tool.
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: PID List
    • Monitor the appropriate PID for the Transmission Fluid Temperature (TFT) sensor.
    • Can the PIDs be monitored? 
    1. YES  : Go to  G2.
    2. NO  : REPEAT procedure to enter PID list. If the vehicle did not enter PID list, REFER to the INTRODUCTION - GASOLINE ENGINES article or INTRODUCTION - 6.4L DIESEL ENGINES article for diagnosis of the PCM.
  2. G2 WARM-UP/COOL-DOWN CYCLE 
    • While monitoring the TFT PIDs, carry out the following test: If transmission is cold, operate to warm it up. If transmission is warm, allow transmission to cool down.
    • Does the TFT PIDs temperature increase as the transmission is warmed up or decrease as the transmission is cooled or does the TFT drop in and out of range? 
    1. YES  : Does the TFT PIDs temperature increase as the transmission is warmed or decrease as the transmission is cooled, CLEAR the DTCs. CARRY OUT the road test to verify if concern is still present. If concern is still present, REFER to Diagnosis By Symptom to diagnose transmission overheating.
    2. NO  : Go to  G3.
  3. G3 ELECTRICAL SIGNAL CHECK 
    • Disconnect: Transmission vehicle harness C1385
    • Visually inspect all wires and connector for damage.
      • Fig 1: Electrical Signal Check
      GF0044739Courtesy of FORD MOTOR CO.
    • Measure the voltage between the transmission vehicle harness C1385-18, harness side and ground.
    • Is the voltage between 4.5 and 5.5 volts? 
    1. YES  : Go to  G4.
    2. NO  : REPAIR an open or short in the transmission vehicle harness. CLEAR the DTCs. TEST the system for normal operation. If normal operation does not return, INSTALL a new TCM.
  4. G4 CHECK THE RESISTANCE OF THE TFT SENSOR 
      Fig 2: Checking Resistance Of TFT Sensor
      GF0044740Courtesy of FORD MOTOR CO.
    • Measure the resistance between the transmission internal harness C1385-18 and C1385-22, component side.
    • Record the resistance.
    • Resistance should be approximately in the following ranges using the following chart.
      TRANSMISSION FLUID TEMPERATURE (TFT)

      °C °F Resistance (Ohms)
      -40 to -20 -40 to -4 967K-284K
      -19 to -1 -3 to 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 in range? 
    1. YES  : REFER to Diagnosis By Symptom to diagnose an overheating concern.
    2. NO  : Go to  G5.
  5. G5 CHECK THE INTERNAL HARNESS FOR AN OPEN 
    • Drain the transmission fluid.
    • Remove the transmission fluid pan.
    • Disconnect: TFT Sensor
    • Measure the resistance between the transmission internal harness C1385-18 and C1385-22 and the TFT sensor connector using the following chart.
      Transmission Connector TFT Pin
      C1385-18 1
      C1385-22 2
    • Are the resistances less than 0.5 ohm? 
    1. YES  : Go to  G6.
    2. NO  : INSTALL a new internal harness. CLEAR the DTCs. TEST the system for normal operation.
  6. G6 CHECK THE INTERNAL HARNESS FOR A SHORT TO GROUND 
      Fig 3: Checking Internal Harness For A Short To Ground
      GF0044741Courtesy of FORD MOTOR CO.
    • Measure the resistance between transmission internal harness C1385 and ground using the following chart.
      Transmission Connector Ground
      C1385-18 Ground
      C1385-22 Ground
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  G7.
    2. NO  : INSTALL a new internal harness. CLEAR the DTCs. TEST the system for normal operation.
  7. G7 CHECK THE RESISTANCE AT THE SENSOR 
    • Measure the resistance between pins 1 and 2 at the TFT sensor.
      TRANSMISSION FLUID TEMPERATURE (TFT)

      °C °F Resistance (Ohms)
      -40 to -20 -40 to -4 967K-284K
      -19 to -1 -3 to 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 specification? 
    1. YES  : CLEAR the DTCs. If the DTCs return and an overtemp condition is present, REFER to INTRODUCTION - GASOLINE ENGINES article or INTRODUCTION - 6.4L DIESEL ENGINES article. If the condition returns, INSTALL a new TCM.
    2. NO  : INSTALL a new TFT sensor. CLEAR the DTCs. TEST the system for normal operation.
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