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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 71 (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 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to 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 temperature or voltage 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 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 ELECTRICAL SIGNAL CHECK 
    • Disconnect: Transmission Harness Connector C199
    • Visually inspect all wires and connectors for damage.
      • Fig 1: Measuring Voltage At C199-2, Circuit 922 (OG/BK) Harness Side
      GF0015423Courtesy of FORD MOTOR CO.
    • Measure the voltage at C199-2, circuit 922 (OG/BK) harness side.
    • Is the voltage between 4.5 and 5.0 volts? 
    1. YES  : Go to  B4.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. B4 CHECK RESISTANCE OF THE TFT SENSOR 
      Fig 2: Measuring Resistance Between C199-2 & C199-12 At Solenoid Body Connector
      GF0015424Courtesy of FORD MOTOR CO.
    • Measure the resistance between C199-2 and C199-12 at the solenoid body 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 in the range? 
    1. YES  : REFER to Diagnosis By Symptom  to diagnose an overheating concern.
    2. NO  : INSTALL a new solenoid body assembly.
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