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Pinpoint Test B : Check TFT Input Signal

WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

  1. B1 CHECK TFT INPUT SIGNAL

    NOTE: If the scan tool is unable to access the transmission PIDs, refer to Engine Controls - Introduction (Except Diesel & Hybrid) .
    NOTE: Read and record all DTCs.

    • Ignition OFF.
    • Disconnect: Transmission Vehicle Harness C1575 .
    • Inspect the connector for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
    • Ignition ON.
    • Using a diagnostic scan tool, monitor the TFT PIDs: TFT and TFTV

    Does the TFT PID display -40 °C (-40 °F) and the TFTV PID display 4.96 to 5.10 volts? 

    Yes  GO to  B2.
    No  REPAIR the vehicle harness circuit.

  2. B2 CHECK TFT SIGNAL INPUT CIRCUIT FOR VOLTAGE

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1575-6
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage between 4.8 and 5.1 volts? 

    Yes  GO to  B3.
    No  INSPECT and REPAIR transmission vehicle harness circuit for an open. If an open circuit is not found, INSTALL a new PCM, REFER to Electronic Engine Controls . PROGRAM the PCM with the latest calibration level. PERFORM the Solenoid Body Strategy Data Download procedure. REFER to Solenoid Body Strategy .

  3. B3 CHECK TFT SIGNAL RETURN CIRCUIT

    • Connect a fused jumper between the transmission vehicle harness C1575-5 and C1575-6 , harness side.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1575-5
      GFD135987Courtesy of FORD MOTOR COMPANY
      		 C1575-6

    Does the TFT PID display 190 °-195 °C (374 °-383 °F) and the TFTV PID display 0 volts? 

    Yes  GO to  B4.
    No  INSPECT and REPAIR the transmission vehicle harness signal return circuit for an open. If an open circuit is not found, INSTALL a new PCM, REFER to Electronic Engine Controls . PROGRAM the PCM with the latest calibration level. PERFORM the Solenoid Body Strategy Data Download procedure. REFER to Solenoid Body Strategy .

  4. B4 CHECK TFT SENSOR RESISTANCE

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1575-5
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 C1575-6

      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

    Does the temperature to resistance specifications match? 

    Yes  REFER to Diagnosis By Symptom  to diagnose an overheating concern.
    No  INSPECT and CLEAN the TFT sensor on the molded leadframe for metallic contamination. INSTALL a new molded leadframe if no debris was found, REFER to Shift Solenoids (SS) .
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