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Home >> Mercury >> 2008 >> Milan Base, 2.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1410 (Automatic Transmission - FNR5) >> Diagnostic Tests >> Pinpoint Tests - OSC Equipped Vehicle >> Pinpoint Tests >> Pinpoint Test B: TFT Sensor

Pinpoint Test B: TFT Sensor

WARNING: This page is about a different car, the 2009 Mercury Milan and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to the Transaxle Main Valve Body Vehicle Harness Connector illustration Transaxle Connector Layouts .
  1. B1 ELECTRONIC DIAGNOSTIC SETUP 
    • Key in OFF position.
    • Select PARK.
    • Check to make sure the transaxle main valve body vehicle harness C1534 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: DataLogger Mode
    • Select the following PIDs: TFT and TFTV to monitor.
    • Does the vehicle enter DataLogger Mode? 
    1. YES  : REMAIN in DataLogger Mode. Go to  B2 .
    2. NO  : REPEAT procedure to enter DataLogger Mode. If vehicle did not enter DataLogger Mode, REFER to the Introduction - Gasoline Engines article for diagnosis of PCM.
  2. B2 WARM-UP/COOL-DOWN CYCLE VERIFICATION 
    • While monitoring the TFT PID, carry out the following test: If transaxle is cold, run transaxle to warm it up. If transaxle is warm, allow transaxle to cool down.
    • Does the TFT PID increase as the transaxle is warmed up or decrease as the transaxle is cooled or does the TFT or TFTV PID drop in and out of range? 
    1. YES  : If the TFT PID increase as the transaxle is warmed or decrease as the transaxle 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 transaxle overheating. If the TFT drops 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 THE TCM AND TRANSAXLE MAIN VALVE BODY VEHICLE HARNESS FOR POWER 
    • Disconnect: Transaxle Main Valve Body Vehicle Harness C1534
    • Visually inspect all wires and connectors for damage.
      • Fig 1: Measuring Voltage Between Transaxle Main Valve Body Vehicle Harness C1534-4, Circuit VET28 (GY/VT)
      GF0041441Courtesy of FORD MOTOR CO.
    • Measure the voltage between transaxle main valve body vehicle harness C1534-4, circuit VET28 (GY/VT), harness side and ground.
      • Fig 2: Measuring Voltage Between Transaxle Main Valve Body Vehicle Harness C1534-5, Circuit VET27 (BN/YE)
      GF0041442Courtesy of FORD MOTOR CO.
    • Measure the voltage between transaxle main valve body vehicle harness C1534-5, circuit VET27 (BN/YE), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  B4.
    2. NO  : Go to  B5.
  4. B4 CHECK THE TRANSAXLE MAIN VALVE BODY VEHICLE HARNESS C1534 FOR A SHORT TO POWER 
    • Disconnect: Transmission Control Module (TCM) C2352b
    • Visually inspect all wires and connectors for damage.
      • Fig 3: Measuring Voltage Between Transaxle Main Valve Body Vehicle Harness C1534-4, Circuit VET28 (GY/VT)
      GF0041441Courtesy of FORD MOTOR CO.
    • Measure the voltage between transaxle main valve body vehicle harness C1534-4, circuit VET28 (GY/VT), harness side and ground.
      • Fig 4: Measuring Voltage Between Transaxle Main Valve Body Vehicle Harness C1534-5, Circuit VET27 (BN/YE)
      GF0041442Courtesy of FORD MOTOR CO.
    • Measure the voltage between transaxle main valve body vehicle harness C1534-5, circuit VET27 (BN/YE), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : REPAIR the circuit for a short to power. TEST the system for normal operation.
    2. NO  : INSTALL a new TCM. TEST the system for normal operation.
  5. B5 CHECK THE TCM AND TRANSAXLE MAIN VALVE BODY VEHICLE HARNESS FOR GROUND 
    • Connect: TCM C2352B
    • Visually inspect all wires and connectors for damage.
      • Fig 5: Measuring Resistance Between Transaxle Main Valve Body Vehicle Harness C1534-4, Circuit VET28 (GY/VT)
      GF0041443Courtesy of FORD MOTOR CO.
    • Measure the resistance between transaxle main valve body vehicle harness C1534-4, circuit VET28 (GY/VT), harness side and ground.
      • Fig 6: Measuring Resistance Between Transaxle Main Valve Body Vehicle Harness C1534-5, Circuit VET27 (BN/YE)
      GF0041444Courtesy of FORD MOTOR CO.
    • Measure the resistance between transaxle main valve body vehicle harness C1534-5, circuit VET27 (BN/YE), harness side and ground.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  B7.
    2. NO  : Go to  B6.
  6. B6 CHECK THE TRANSAXLE MAIN VALVE BODY VEHICLE HARNESS C1534 FOR A SHORT TO GROUND 
    • Disconnect: TCM C2352B
    • Visually inspect all wires and connectors for damage.
      • Fig 7: Measuring Resistance Between Transaxle Main Valve Body Vehicle Harness C1534-4, Circuit VET28 (GY/VT)
      GF0041443Courtesy of FORD MOTOR CO.
    • Measure the resistance between transaxle main valve body vehicle harness C1534-4, circuit VET28 (GY/VT), harness side and ground.
      • Fig 8: Measuring Resistance Between Transaxle Main Valve Body Vehicle Harness C1534-5, Circuit VET27 (BN/YE)
      GF0041444Courtesy of FORD MOTOR CO.
    • Measure the resistance between transaxle main valve body vehicle harness C1534-5, circuit VET27 (BN/YE), harness side and ground.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : INSTALL a new TCM. TEST the system for normal operation.
    2. NO  : REPAIR the circuit for a short to ground. TEST the system for normal operation.
  7. B7 CHECK THE TRANSAXLE MAIN VALVE BODY VEHICLE HARNESS C1534 FOR AN OPEN 
      Fig 9: Checking Vehicle Harness For An Open (1 Of 2)
      GF0029716Courtesy of FORD MOTOR CO.
    • Measure the resistance between transaxle main valve body vehicle harness C1534-5, circuit VET27 (BN/YE), harness side and TCM C2352B-6, circuit VET27 (BN/YE).
      • Fig 10: Checking Vehicle Harness For An Open (2 Of 2)
      GF0029717Courtesy of FORD MOTOR CO.
    • Measure the resistance between transaxle main valve body vehicle harness C1534-4, circuit VET28 (GY/VT), and TCM C2352B-5, circuit VET28 (GY/VT).
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  B8.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  8. B8 CHECK THE TRANSAXLE MAIN VALVE BODY INTERNAL HARNESS FOR A SHORT TO GROUND 
      Fig 11: Measuring Resistance Between Transaxle Main Valve Body Internal Harness C1534-5 & Ground
      GF0041445Courtesy of FORD MOTOR CO.
    • Measure the resistance between transaxle main valve body internal harness C1534-5 and ground.
      • Fig 12: Measuring Resistance Between Transaxle Main Valve Body Internal Harness C1534-4 & Ground
      GF0041446Courtesy of FORD MOTOR CO.
    • Measure the resistance between transaxle main valve body internal harness C1534-4 and ground.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  B9.
    2. NO  : INSTALL a new transaxle main valve body internal harness. TEST the system for normal operation.
  9. B9 CHECK RESISTANCE OF THE TFT SENSOR 
      Fig 13: Checking Resistance Of TFT Sensor
      GF0029719Courtesy of FORD MOTOR CO.
    • Measure the resistance between transaxle main valve body internal harness C1534-5 and C1534-4.
    • Record the resistance.
    • Resistance should be approximately in the following ranges:
      • -20°C (-4°F) - 236K-317K ohms
      • 0°C (32°F) - 83.2K-107K ohms
      • 20°C (68°F) - 33.5K-41.2K ohms
      • 40°C (104°F) - 14.6K-17.6K ohms
      • 60°C (140°F) - 7.08K-8.01K ohms
      • 80°C (176°F) - 3.61K-4.06K ohms
      • 100°C (212°F) - 1.96K-2.20K ohms
      • 120°C (248°F) - 1.13K-1.25K ohms
      • 130°C (266°F) - 0.87K-0.96K ohms
    • Are the resistances in the range? 
    1. YES  : REFER to Diagnosis By Symptom  to diagnose an overheating concern.
    2. NO  : INSTALL a new transaxle internal harness. TEST the system for normal operation.
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