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Pinpoint Test C: TSS And OSS Sensors

NOTE: Refer to the Transaxle Vehicle Harness Connector illustration TRANSAXLE CONNECTOR LAYOUTS .
NOTE: Refer to the Transaxle Internal Harness Diagram illustration TRANSAXLE CONNECTOR LAYOUTS .
  1. C1 ELECTRONIC DIAGNOSTICS 
    • Check to make sure transaxle vehicle harness C168 is fully seated, terminals are engaged in connector and in good condition before proceeding.
    • Have the items above been checked? 
    • Yes  : GO to C2.
    • No  : CARRY OUT the checks. CLEAR the DTCs. RERUN the On-Board Diagnostic (OBD) Tests.
  2. C2 ELECTRONIC DIAGNOSTICS 
    • Connect the scan tool.
    • Monitor the speed sensor PIDs while test driving the vehicle.
    • Are the Turbine Shaft Speed (TSS) and Output Shaft Speed (OSS) sensor signals present and consistent? 
    • Yes  : The condition that set the DTC is intermittent and is not currently present. ERASE the codes. RERUN the OBD  Tests.
    • No  : GO to C3.
  3. C3 CHECK THE TRANSAXLE VEHICLE HARNESS FOR AN OPEN CIRCUIT 
    • Ignition OFF.
    • Disconnect: Transaxle Vehicle Harness C168.
    • Disconnect: PCM Transaxle C175T.
    • Use a mirror to inspect both ends of the connectors for damage or pushed-out pins, corrosion, loose wires and missing or damaged seals.
    • Measure the resistance for the speed sensor circuits between the transaxle vehicle harness C168 and the PCM transaxle C175T.
      SPEED SENSOR CIRCUIT REFERENCE

      Speed Sensor Circuit Transaxle Vehicle Harness C168 PCM Transaxle C175T
      TSS  /OSS  power supply LE111 (VT/GN) C168-20 C175T-41
      TSS  /OSS  ground RET24 (BN/BU) C168-9 C175T-45
      TSS  sensor signal VET33 (WH/OG) C168-19 C175T-15
      OSS  sensor signal VET26 (BN/GN) C168-10 C175T-14
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to C4.
    • No  : REPAIR the circuit(s) for an open. CONNECT all components. TEST the system for normal operation.
  4. C4 CHECK THE TRANSAXLE VEHICLE HARNESS FOR A SHORT TO GROUND 
    • Measure the resistance for the speed sensor circuits between transaxle vehicle harness C168 and ground.
      SPEED SENSOR CIRCUIT REFERENCE

      Speed Sensor Circuit Transaxle Vehicle Harness C168 Ground
      TSS  /OSS  power supply LE111 (VT/GN) C168-20 Ground
      TSS  /OSS  ground RET24 (BN/BU) C168-9 Ground
      TSS  sensor signal VET33 (WH/OG) C168-19 Ground
      OSS  sensor signal VET26 (BN/GN) C168-10 Ground
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : GO to C5.
    • No  : REPAIR the circuit(s) for a short to ground. CONNECT all components. TEST the system for normal operation.
  5. C5 CHECK THE TRANSAXLE VEHICLE HARNESS FOR A SHORT TO VPWR 
    • Ignition ON.
    • Check for voltage from the speed sensor circuits at transaxle vehicle harness C168.
      SPEED SENSOR CIRCUIT REFERENCE

      Speed Sensor Circuit Transaxle Vehicle Harness C168 Ground
      TSS  /OSS  power supply LE111 (VT/GN) C168-20 Ground
      TSS  /OSS  ground RET24 (BN/BU) C168-9 Ground
      TSS  sensor signal VET33 (WH/OG) C168-19 Ground
      OSS  sensor signal VET26 (BN/GN) C168-10 Ground
    • Is any voltage present? 
    • Yes  : REPAIR the circuit(s) for a short to voltage. CONNECT all components. TEST the system for normal operation.
    • No  : GO to C6.
  6. C6 CHECK THE SOLENOID BODY FOR AN INTERNAL OPEN CIRCUIT 
    • Ignition OFF.
    • Remove the main control cover. Refer to MAIN CONTROL COVER .
    • Disconnect: TSS  Sensor.
    • Disconnect: OSS  Sensor.
    • Use a mirror to inspect both ends of the connectors for damage or pushed-out pins, corrosion, loose wires and missing or damaged seals.
      • NOTE: The OSS  sensor is above the main solenoid body connector next to the Transmission Range (TR) sensor, the TSS  sensor connector is below the main solenoid body connector.
    • Measure the resistance of the solenoid body internal speed sensor power circuit between the main solenoid body connector pin 20, solenoid body side and the TSS  or OSS  sensor connectors pin 2, solenoid body side.
      Fig 1: Measuring Resistance Between Main Solenoid Body Connector And TSS Or OSS Sensor Connectors Pins
      G06067639Courtesy of FORD MOTOR CO.
      • NOTE: The OSS  sensor is above the main solenoid body connector next to the TR  sensor.
    • Measure the resistance of the solenoid body internal speed sensor ground circuit between the main solenoid body connector pin 9, solenoid body side and OSS  sensor connector pin 3, solenoid body side.
      Fig 2: Measuring Resistance Between Main Solenoid Body Connector And OSS Sensor Connector Pins
      G06067640Courtesy of FORD MOTOR CO.
      • NOTE: The TSS  sensor connector is below the main solenoid body connector.
    • Measure the resistance of the solenoid body internal speed sensor ground circuit between the main solenoid body connector pin 9, solenoid body side and TSS  sensor connector pin 1, solenoid body side.
      Fig 3: Measuring Resistance Between Main Solenoid Body Connector And TSS Sensor Connector Pins
      G06067641Courtesy of FORD MOTOR CO.
      • NOTE: The TSS  sensor connector is below the main solenoid body connector.
    • Measure the resistance of the solenoid body internal circuit for the TSS  sensor signal between the main solenoid body connector pin 19, solenoid body side and TSS  sensor connector pin 3, solenoid body side.
      Fig 4: Measuring Resistance Between Main Solenoid Body Connector And TSS Sensor Connector Pins
      G06067642Courtesy of FORD MOTOR CO.
      • NOTE: The OSS  sensor is above the main solenoid body connector next to the TR  sensor.
    • Measure the resistance of the solenoid body internal circuit for the OSS  sensor signal between the main solenoid body connector pin 10, solenoid body side and OSS  sensor connector pin 1, solenoid body side.
      Fig 5: Measuring Resistance Between Main Solenoid Body Connector And OSS Sensor Connector Pins
      G06067643Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to C7.
    • No  : INSTALL a new solenoid body. REFER to SOLENOID BODY ASSEMBLY . CONNECT all components. TEST the system for normal operation.
  7. C7 CHECK FOR VOLTAGE AT THE SPEED SENSOR CONNECTORS 
    • Connect: PCM Transaxle C175T.
    • Connect: Transaxle Vehicle Harness Connector C168.
    • Ignition ON.
    • Measure the voltage at TSS  sensor connector pin 2, solenoid body side or OSS  sensor connector pin 2, solenoid body side.
      Fig 6: Measuring Voltage At TSS Sensor Connector Or OSS Sensor Connector Pins
      G06067644Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to C8.
    • No  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS . CONNECT all components. TEST the system for normal operation.
  8. C8 CHECK FOR REFERENCE SIGNAL VOLTAGE AT THE SPEED SENSOR CONNECTORS 
      NOTE: The TSS  sensor connector is below the main solenoid body connector.
    • Measure the voltage at TSS  sensor connector pin 3, solenoid body side.
      Fig 7: Measuring Voltage At TSS Sensor Connector Pin 3
      G06067645Courtesy of FORD MOTOR CO.
      • NOTE: The OSS  sensor is above the main solenoid body connector next to the TR  sensor.
    • Measure the voltage at OSS  sensor connector pin 1, solenoid body side.
      Fig 8: Measuring Voltage At OSS Sensor Connector Pin 1
      G06067646Courtesy of FORD MOTOR CO.
    • Is the voltage between 4.5 and 5.5 volts? 
    • Yes  : GO to C9.
    • No  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS . CONNECT all components. TEST the system for normal operation.
  9. C9 CHECK FOR GROUND AT THE SPEED SENSOR CONNECTORS 
    • Ignition OFF.
      • NOTE: The TSS  sensor connector is below the main solenoid body connector.
    • Measure the resistance between TSS  sensor connector pin 1, solenoid body side and ground.
      Fig 9: Measuring Resistance Between TSS Sensor Connector Pin 1 And Ground
      G06067647Courtesy of FORD MOTOR CO.
      • NOTE: The OSS  sensor is above the main solenoid body connector next to the TR  sensor.
    • Measure the resistance between OSS  sensor connector pin 3, solenoid body side and ground.
      Fig 10: Measuring Resistance Between OSS Sensor Connector Pin 3 And Ground
      G06067648Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
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