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Home >> Ford >> 2002 >> Cutaway 7.3 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 2913 (Automatic Transmission 5R110W (TORQSHIFT(R)) -- F450-F550 Super Duty) >> Diagnosis & Testing >> Pinpoint Tests - OSC Equipped Vehicle >> 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 2011 Ford F550 Super Duty and 2011 Ford F450 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to the Transmission Vehicle Harness Connector illustration within the TRANSMISSION CONNECTOR LAYOUTS  procedure in this service information.
NOTE: Refer to the Transmission Internal Harness Connector illustration within the TRANSMISSION CONNECTOR LAYOUTS  procedure in this service information.
NOTE: Read and record all DTCs.
NOTE: Use the PID Chart for available diagnostic PIDs. Refer to DIAGNOSTIC PARAMETERS IDENTIFICATION (PID) CHART  in this service information.
  1. B1 ELECTRONIC DIAGNOSTICS 
    • Select PARK.
    • Ignition OFF.
    • 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 scan tool.
    • Ignition ON.
    • Access the Transmission Fluid Temperature (TFT) PID.
    • Can the PIDs be monitored? 
    • Yes:  GO to  B2
    • No:  REPEAT procedure to access the transmission PIDs. If the scan tool did not access the transmission PIDs, REFER to the INTRODUCTION article for diagnosis of the PCM.
  2. B2 WARM-UP/COOL-DOWN CYCLE 
    • While monitoring the TFT  PID, carry out the following test: If transmission is cold, warm the transmission up. If transmission is warm, allow transmission to cool down.
    • Does the TFT  PID increase as the transmission is warmed up or decrease as the transmission is cooled or does the TFT  drop in and out of range?
    • Yes:  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  in this service information to diagnose transmission overheating.
    • No:  GO to  B3.
  3. B3 ELECTRICAL SIGNAL CHECK 
    • Disconnect: Transmission Vehicle Harness C1385.
    • Visually inspect all wires and connector for damage.
    • Measure the voltage between the transmission vehicle harness C1385-18, harness side and ground.
      Fig 1: Measuring Voltage Between Transmission Vehicle Harness C1385-18, Harness Side And Ground
      G07482150Courtesy of FORD MOTOR CO.
    • Is voltage between 4.5 and 5.5 volts? 
    • Yes:  GO to  B4
    • 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 PCM.
  4. B4 CHECK THE RESISTANCE OF THE TFT  SENSOR
    • Measure the resistance between the transmission internal harness C1385-18 and C1385-22, component side.
      Fig 2: Measuring Resistance Between Transmission Internal Harness C1385-18 And C1385-22, Component Side
      G07482151Courtesy of FORD MOTOR CO.
    • Record the resistance.
    • Resistance should be within specification using the following chart.
      RESISTANCE REFERENCE CHART

      °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 resistance within specification? 
    • Yes:  REFER to DIAGNOSIS BY SYMPTOM  in this service information to diagnose an overheating concern.
    • No:  GO to  B5.
  5. B5 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 and C1385-22 and the TFT  sensor connector using the following chart.
      RESISTANCE REFERENCE CHART

      Transmission Connector TFT  Terminal
      C1385-18 1
      C1385-22 2
    • Is resistance less than 5 ohms? 
    • Yes:  GO to  B6
    • No:  INSTALL a new internal harness. CLEAR the DTCs. TEST the system for normal operation.
  6. B6 CHECK THE INTERNAL HARNESS FOR A SHORT TO GROUND 
    • Measure the resistance between transmission internal harness C1385 and ground using the following chart.
      RESISTANCE REFERENCE CHART

      Transmission Connector Ground
      C1385-18 Ground
      C1385-22 Ground
      Fig 3: Measuring Resistance Between Transmission Internal Harness C1385 And Ground
      G07482152Courtesy of FORD MOTOR CO.
    • Is resistance greater than 10,000 ohms? 
    • Yes:  GO to  B7
    • No:  INSTALL a new internal harness. CLEAR the DTCs. TEST the system for normal operation.
  7. B7 CHECK THE RESISTANCE AT THE SENSOR 
    • Measure the resistance between terminals 1 and 2 at the TFT  sensor.
      RESISTANCE REFERENCE CHART

      °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 resistance within specification? 
    • Yes:  CLEAR the DTCs. If the DTCs return and an overtemp condition is present, REFER to the INTRODUCTION article. If the condition returns, INSTALL a new PCM.
    • No:  INSTALL a new TFT  sensor. CLEAR the DTCs. TEST the system for normal operation.
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