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Home >> Ford >> 2012 >> Mustang Base, 2D Convertible, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 22 (Automatic Transmission - 6R140 (TORQSHIFT(R)6)) -- F250-F550 Super Duty) >> Diagnosis & 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 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 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 - GASOLINE MODELS .
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: Measuring Voltage Between Transmission Vehicle Harness C1623-18, Circuit VET27 (BN/YE), Harness Side And Ground
      G07482733Courtesy 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: Connecting Fused Jumper Between Transmission Vehicle Harness C1623-18, Circuit VET27 (BN/YE) And C1623-19, Circuit RE406 (GY/VT)
      G07482734Courtesy 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)

      °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: Measuring Resistance Between Transmission C1623-18, And C1623-19, Component Side
      G07482735Courtesy 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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