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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 892 (Automatic Transmission) >> Diagnostic Tests >> 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 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to the Transmission Vehicle Harness Connector illustration Transmission Connector Layouts .
NOTE: Refer to the Transmission Internal Harness Connector illustration Transmission Connector Layouts .
  1. B1 ELECTRONIC DIAGNOSTICS 
    • Select PARK.
    • Key in OFF position.
    • 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.
    • Access the transmission PIDs.
    • Is the scan tool able to access the transmission PIDs? 
    1. YES  : Go to  B2.
    2. NO  : REPEAT procedure to access the transmission PIDs. If the scan tool did not access the transmission PIDs, REFER to the INTRODUCTION - GASOLINE ENGINES for diagnosis of PCM.
  2. B2 WARM-UP/COOL-DOWN CYCLE 
    • While monitoring the transmission fluid temperature (TFT) PIDs, carry out the following test: If transmission is cold, run transmission 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 or TFTV 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. ROAD TEST to verify if concern is still present. If concern is still present, REFER to the Diagnosis by Symptom Index in Diagnosis By Symptom  to diagnose transmission overheating.

      If the TFT sensor temperature or TFT sensor voltage drop in and out of range, INSPECT for intermittent concern in the internal/external harness, sensor or connector.

    2. NO  : Go to  B3.
  3. B3 CHECK CIRCUIT CET06 (GN/BN) 
    • Disconnect: Transmission Harness C168
    • Key in ON position.
      • Fig 1: Measuring Voltage At Transmission Harness C168-4, Circuit Cet06 (GN/BN), Harness Side
      GF0009954Courtesy of FORD MOTOR CO.
    • Measure the voltage at the transmission harness C168-4, circuit CET06 (GN/BN), harness side.
    • Is the voltage between 4.5 and 5.5? 
    1. YES  : Go to  B4.
    2. NO  : CHECK for open or short circuit in vehicle harness, internal harness or a PCM concern.
  4. B4 CHECK RESISTANCE OF TFT SENSOR 
    • Disconnect: Transmission Harness C168
      • Fig 2: Measuring Resistance Of TFT Sensor At Transmission Bulkhead Connector
      GF0009955Courtesy of FORD MOTOR CO.
    • Measure the resistance of the TFT sensor at the transmission bulkhead connector.
    • Record the resistance.
    • Resistance should be approximately in the following ranges:
      TRANSMISSION FLUID TEMPERATURE

      °C °F Resistance (Ohms)
      -40 to -20 -40 to -4 967K - 284K
      -19 to -1 -3 - 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 the resistance within range? 
    1. YES  : REFER to the Diagnosis by Symptom Index in Diagnosis By Symptom  for an overheating concern.
    2. NO  : INSTALL a new internal harness (sensor is part of harness).
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