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Home >> Ford >> 2003 >> Cutaway 7.3 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 2585 (Automatic Transmission - 6R140 (TORQSHIFT(R)6)) -- F250-F550 Super Duty) >> Diagnosis And Testing >> Pinpoint Tests >> Pinpoint Tests - Transmission Control Module (TCM) >> Pinpoint Test G: Transmission Fluid Temperature (TFT) Sensor

Pinpoint Test G: Transmission Fluid Temperature (TFT) Sensor

WARNING: This page is about a different car, the 2011 Ford Pickup, 2011 Ford F550 Super Duty, 2011 Ford F450 Super Duty, and 2011 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If the scan tool is unable to access the transmission PIDs, REFER to the INTRODUCTION .
NOTE: Read and record all DTCs.
  1. G1 CHECK THE TFT  INPUT CIRCUIT
    • Ignition OFF.
    • Connect the scan tool.
    • Disconnect: Transmission C1623.
    • Inspect the connector for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
    • Ignition ON.
    • Access the TFT and TFTV PIDs on the scan tool.
    • Does the TFT PID display -40°C (-40°F) and TFTV PID display 4.9 volts? 
    • Yes:  GO to  G2.
    • No:  REPAIR the vehicle harness circuit VET27 (BN/YE) for a short to ground. CLEAR the DTCs. TEST the system for normal operation.
  2. G2 CHECK THE TFT  INPUT SIGNAL CIRCUIT FOR VOLTAGE
    • Measure the voltage between the transmission vehicle harness C1623-18, circuit VET27 (BN/YE), harness side and ground.
      Fig 1: Checking TFT Input Signal Circuit Connector End View
      G07482748Courtesy of FORD MOTOR CO.
    • Is the voltage between 3.0 and 5.1 volts? 
    • Yes:  GO to  G3.
    • No:  INSPECT the vehicle harness circuit VET27 (BN/YE) for an open. If an open circuit is not found, REPLACE the TCM  . PROGRAM the TCM  with the latest calibration level. PERFORM the solenoid strategy download procedure. REFER to SOLENOID BODY STRATEGY . TEST the system for normal operation.
  3. G3 CHECK THE TFT  SIGNAL RETURN CIRCUIT
    • Connect a fused jumper between transmission vehicle harness C1623-18, circuit VET27 (BN/YE), harness side and C1623-19, circuit RE406 (GY/VT), harness side.
      Fig 2: Checking TFT Signal Return Circuit Connector End View
      G07482749Courtesy of FORD MOTOR CO.
    • Does the TFT PID display a temperature between 195°C-200°C (383°F-392°F) and TFTV PID display 0 volts? 
    • Yes:  GO to  G4.
    • No:  INSPECT the vehicle harness circuit RE406 (GY/VT) for an open. If an open circuit is not found, REPLACE the TCM  . PROGRAM the TCM  with the latest calibration level. PERFORM the solenoid strategy download procedure. REFER to SOLENOID BODY STRATEGY . TEST the system for normal operation.
  4. G4 CHECK THE TFT  INTERNAL HARNESS/COMPONENT
    • Measure the resistance between the transmission C1623-18, and C1623-19, component side using the following chart.

      TRANSMISSION FLUID TEMPERATURE (TFT) 

      RESISTANCE REFERENCE CHART

      °C °F Resistance
      -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
      Fig 3: Checking TFT Internal Harness/Component Connector End View
      G07482750Courtesy of FORD MOTOR CO.
    • Does the temperature to resistance specifications match? 
    • Yes:  REFER to DIAGNOSIS BY SYMPTOM  to diagnose an overheating concern.
    • No:  INSPECT the transmission internal harness for an open or short to ground. If an open or short to ground is not found, REPLACE the TFT  sensor.
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