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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 G: TSS Sensor

Pinpoint Test G: TSS 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 Turbine Shaft Speed (TSS) Sensor Connector illustrations Transaxle Connector Layouts .
  1. G1 ELECTRONIC DIAGNOSTICS SETUP 
    • Check to make sure the transaxle harness connectors are 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 TSS PID.
    • Does vehicle enter DataLogger Mode? 
    1. YES  : REMAIN in DataLogger Mode. Go to  G2 .
    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 the Transmission Control Module (TCM).
  2. G2 DRIVE CYCLE TEST 
    • While monitoring the TSS sensor PID, drive the vehicle so that the transaxle upshifts and downshifts through all gears.
    • Does the TSS PID speed increase and decrease with engine and vehicle speed? 
    1. YES  : Go to  G3.
    2. NO  : If the TSS PID speed does not increase and decrease with engine and vehicle speed, INSPECT for open or short in vehicle harness, sensor, a TCM concern, or internal hardware concern. Go to  G4 .
  3. G3 DRIVE CYCLE TEST ERRATIC 
    • While monitoring the TSS sensor PID, drive the vehicle so that the transaxle upshifts and downshifts through all gears.
    • Is the TSS PID speed signal erratic (drop to zero or near zero and return to normal operation)? 
    1. YES  : If the sensor signal is erratic, INSPECT for intermittent concern in the harness, sensor or connector. Go to  G4 .
    2. NO  : CLEAR all DTCs. Rerun On-Board Diagnostic (OBD).
  4. G4 CHECK THE TCM AND HARNESS FOR POWER 
    • Key in OFF position.
    • Disconnect: Turbine Shaft Speed (TSS) Sensor C143
    • Key in ON position.
      • Fig 1: Measuring Voltage Between TSS Sensor C143-1, Circuit VET33 (WH/OG) & Ground
      GF0041459Courtesy of FORD MOTOR CO.
    • Measure the voltage between TSS sensor C143-1, circuit VET33 (WH/OG) and ground.
      • Fig 2: Measuring Voltage Between TSS Sensor C143-2, Circuit RET33 (WH/VT) & Ground
      GF0041460Courtesy of FORD MOTOR CO.
    • Measure the voltage between TSS sensor C143-2, circuit RET33 (WH/VT) and ground.
    • Is any voltage present? 
    1. YES  : Go to  G5.
    2. NO  : Go to  G6.
  5. G5 CHECK THE HARNESS FOR A SHORT TO POWER 
    • Key in OFF position.
    • Disconnect: TCM C2352B
    • Key in ON position.
      • Fig 3: Measuring Voltage Between TSS Sensor C143-1, Circuit VET33 (WH/OG) & Ground
      GF0041459Courtesy of FORD MOTOR CO.
    • Measure the voltage between TSS sensor C143-1, circuit VET33 (WH/OG) and ground.
      • Fig 4: Measuring Voltage Between TSS Sensor C143-2, Circuit RET33 (WH/VT) & Ground
      GF0041460Courtesy of FORD MOTOR CO.
    • Measure the voltage between TSS sensor C143-2, circuit RET33 (WH/VT) 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.
  6. G6 CHECK THE TCM AND HARNESS FOR GROUND 
    • Key in OFF position.
    • Connect: TCM C2352B
      • Fig 5: Measuring Resistance Between TSS Sensor C143-1, Circuit VET33 (WH/OG) & Ground
      GF0041461Courtesy of FORD MOTOR CO.
    • Measure the resistance between TSS sensor C143-1, circuit VET33 (WH/OG) and ground.
      • Fig 6: Measuring Resistance Between TSS Sensor C143-2, Circuit RET33 (WH/VT) & Ground
      GF0041462Courtesy of FORD MOTOR CO.
    • Measure the resistance between TSS sensor C143-2, circuit RET33 (WH/VT) and ground.
    • Are the resistances greater than 10,000 ohms? 
    1. YES  : Go to  G8.
    2. NO  : Go to  G7.
  7. G7 CHECK THE HARNESS FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: TCM C2352B
      • Fig 7: Measuring Resistance Between TSS Sensor C143-1, Circuit VET33 (WH/OG) & Ground
      GF0041461Courtesy of FORD MOTOR CO.
    • Measure the resistance between TSS sensor C143-1, circuit VET33 (WH/OG) and ground.
      • Fig 8: Measuring Resistance Between TSS Sensor C143-2, Circuit RET33 (WH/VT) & Ground
      GF0041462Courtesy of FORD MOTOR CO.
    • Measure the resistance between TSS sensor C143-2, circuit RET33 (WH/VT) 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.
  8. G8 CHECK THE RESISTANCE OF THE TSS SENSOR 
    • Measure the resistance between TSS sensor C143 pin 1, component side and TSS sensor C143 pin 2, component side.
      • Fig 9: Measuring Resistance Of TSS Sensor
      GF0029741Courtesy of FORD MOTOR CO.
    • Record the resistance. Resistance should be as follows:
      • 273-333 ohms at -20°C (-4°F)
      • 330-390 ohms at 21°C (70°F)
      • 487-601 ohms at 160°C (302°F)
    • Are the resistances within specification? 
    1. YES  : Go to  G9.
    2. NO  : INSTALL a new sensor. TEST the system for normal operation.
  9. G9 CHECK THE SENSOR FOR A SHORT TO GROUND 
      Fig 10: Checking Sensor For A Short To Ground
      GF0029742Courtesy of FORD MOTOR CO.
    • Measure the resistance between TSS sensor C143 pin 1, component side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : INSTALL a new TSS sensor. TEST the system for normal operation.
    2. NO  : REFER to Diagnosis By Symptom  for diagnosis of shift or torque converter concerns.
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