LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 727 (Automatic Transmission - 5R110W) >> Diagnosis & Testing >> Pinpoint Tests - OSC Equipped Vehicles >> Testing >> 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 2004 Ford RV Cutaway, 2004 Ford Econoline, 2004 Ford E450 Super Duty, and 2004 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Illustration preceding these pinpoint tests
Refer to the TRANSMISSION VEHICLE HARNESS CONNECTOR .
NOTE: Refer to the TRANSMISSION INTERNAL HARNESS CONNECTOR .
NOTE: Read and record all DTCs.
NOTE: Use the PID Chart for available diagnostic PIDs. Refer to OUTPUT STATE CONTROL (OSC) MODE .
  1. B1 ELECTRONIC DIAGNOSTICS 
    • Key in OFF position.
    • Select PARK.
    • Check to make sure the transmission harness connector is fully seated, terminals are fully engaged in connector and in good condition before proceeding.
    • Connect the diagnostic tool.
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Monitor PIDs For TFT.
    • DOES THE VEHICLE ENTER PID/DATA MONITOR AND RECORD? 
    1. YES  REMAIN in PID/Data Control. GO to B2.
    2. NO  REPEAT procedure to enter PID. If vehicle did not enter PID, REFER to the appropriate INTRODUCTION for diagnosis of powertrain control module (PCM) and NGS.
  2. B2 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.
    • DO THE TFT PIDS 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  If the TFT PIDs increase as the transmission is warmed or decrease as the transmission is cooled, CLEAR all 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 B3.
  3. B3 ELECTRICAL SIGNAL CHECK 
    • Disconnect: Transmission Harness Connector.
    • Visually inspect all wires and connectors for damage.
    • Measure the voltage between pin 18 harness side and ground.
    • IS THE VOLTAGE BETWEEN 4.5 AND 5.5 VOLTS? 
    1. YES  GO to B4.
    2. NO  REPAIR the circuit. TEST the system for normal operation.
  4. B4 CHECK THE RESISTANCE OF THE TFT SENSOR 
    • Measure the resistance between pins 18 and 22 at the transmission bulkhead body connector.
    • Record the resistance.
    • Resistance should be approximately in the following ranges:

      TRANSMISSION FLUID TEMPERATURE 

      TRANSMISSION FLUID TEMPERATURE CHART

      °C °F Resistance (Ohms)
      -40 to -20 -40 to -4 967K - 284K
      -19 to -1 -3 to 31 284K - 100K
      0 to 20 32 to 68 100K - 37K
      21 to 40 69 to 104 37K - 16K
      41 to 70 105 to 158 16K - 5K
      71 to 90 159 to 194 5K - 2.7K
      91 to 110 195 to 230 2.7K - 1.5K
      111 to 130 231 to 266 1.5K - 0.8K
      131 to 150 267 to 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 B5.
  5. B5 CHECK THE INTERNAL HARNESS FOR AN OPEN 
    • Drain the transmission fluid.
    • Remove the transmission fluid pan.
    • Disconnect: TFT Sensor Connector.
    • Measure the resistance between the TFT sensor connector pin 1 and the transmission bulkhead connector pin 18.
    • Measure the resistance between the TFT sensor connector pin 2 and the transmission bulkhead connector pin 22.
    • ARE THE RESISTANCES LESS THAN 0.5 OHMS? 
    1. YES  GO to B6.
    2. NO  INSTALL a new harness. GO to  B7.
  6. B6 CHECK THE INTERNAL HARNESS FOR A SHORT TO GROUND 
    • Measure the resistance between the TFT sensor connector pins 18 and 22, and ground.
    • IS THE RESISTANCE GREATER THAN 10,000 OHMS? 
    1. YES  INSTALL a new internal harness.
    2. NO  GO to B7.
  7. B7 CHECK THE RESISTANCE AT THE SENSOR 
    • Measure the resistance between pins 1 and 2 at the TFT sensor.

      TRANSMISSION FLUID TEMPERATURE 

      TRANSMISSION FLUID TEMPERATURE

      °C °F Resistance (Ohms)
      -40 to -20 -40 to -4 967K - 284K
      -19 to -1 -3 to 31 284K - 100K
      0 to 20 32 to 68 100K - 37K
      21 to 40 69 to 104 37K - 16K
      41 to 70 105 to 158 16K - 5K
      71 to 90 159 to 194 5K - 2.7K
      91 to 110 195 to 230 2.7K - 1.5K
      111 to 130 231 to 266 1.5K - 0.8K
      131 to 150 267 to 302 0.8K - 0.54K
    • IS THE RESISTANCE WITHIN SPECIFICATION? 
    1. YES  GO to B8.
    2. NO  INSTALL a new TFT sensor. CLEAR the DTCs. TEST the system for normal operation.
  8. B8 CHECK THE SENSOR FOR A SHORT TO GROUND 
    • Measure the resistance between pins 1 and 2 at the TFT sensor connector and ground.
    • IS THE RESISTANCE LESS THAN 10,000 OHMS? 
    1. YES  INSTALL a new TFT sensor.
    2. NO  INSTALL a new PCM. CLEAR the DTCs. If the DTCs return and an overtemp condition exists, REFER to DIAGNOSIS BY SYMPTOM .
scientia non olet · About LEMON Manuals