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Pinpoint Test

NOTE: If the scan tool is unable to communicate with the Powertrain Control Module (PCM) or access the transmission Parameter Identifications (PIDs), REFER to INTRODUCTION - GASOLINE MODELS .
  1. Read and record all Diagnostic Trouble Codes (DTCs)
    1. Install the scan tool and record all Diagnostic Trouble Codes (DTCs).
      • Were Diagnostic Trouble Codes (DTCs) P0740, P0742, P0743 and/or P0744 set? 
      1. Yes:  For Diagnostic Trouble Codes (DTCs) P0740 and P0743, GO to 2  on page 2.

        For Diagnostic Trouble Code (DTC) P0742 and P0743, GO to 5  on page 4.

        For Diagnostic Trouble Code (DTC) P0744 and P0743, GO to 6  on page 5.

      2. No:  REFER to SYMPTOM CHART: AUTOMATIC TRANSMISSION - 6F50 AND 6F55 .
  2. Check the Torque Converter Clutch (TCC) solenoid circuit for an open
    1. Ignition OFF.
    2. Disconnect the transaxle vehicle harness C168.
    3. Disconnect the Powertrain Control Module (PCM) C175T.
    4. Inspect the connectors for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
    5. Measure the resistance of circuit CET10 (BU/GY) from the transaxle vehicle harness C168-14 to the Powertrain Control Module (PCM) C175T-46.
      Fig 1: Measuring Resistance Of Transaxle Vehicle Harness Connector Terminals
      G07429821Courtesy of FORD MOTOR CO.
      • Is the resistance less than 5 ohms? 
      1. Yes:  GO to 3  on page 3.
      2. No:  REPAIR circuit CET10 (BU/GY) for an open. CLEAR the Diagnostic Trouble Codes (DTCs). TEST the system for normal operation.
  3. Check the Torque Converter Clutch (TCC) for an open
    1. Measure the resistance between the transaxle internal harness, terminal 14 and terminal 15 component side.
      Fig 2: Measuring Resistance Between Transaxle Internal Harness, Terminal 14 And Terminal 15 Connector Terminals
      G07429822Courtesy of FORD MOTOR CO.
      • Is the resistance between 4.0 and 7.2 ohms? 
      1. Yes:  REPLACE the Powertrain Control Module (PCM). PROGRAM the Powertrain Control Module (PCM) with the latest calibration level. PERFORM the Solenoid Body Strategy Data Download procedure. REFER to Solenoid Body Strategy Download. TEST the system for normal operation.
      2. No:  REMOVE the main control cover. REFER to MAIN CONTROL COVER . INSPECT the solenoid body for metal shavings on the exposed metal contacts or other components. CLEAN the solenoid body and RECHECK the resistance value. If the resistance value is out of specification and a short to ground is not found, INSTALL a new solenoid body assembly. REFER to SOLENOID BODY ASSEMBLY . PERFORM the Solenoid Body Strategy Data Download procedure. REFER to Solenoid Body Strategy Download. TEST the system for normal operation.
  4. Check the Torque Converter Clutch (TCC) circuit for a short to ground
    1. Ignition OFF.
    2. Disconnect the transaxle vehicle harness C168.
    3. Disconnect the Powertrain Control Module (PCM) C175T.
    4. Inspect the connectors for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
    5. Measure the resistance of circuit CET10 (BU/GY) from the transaxle vehicle harness C168-14 to ground.
      Fig 3: Measuring Resistance Between Transaxle Vehicle Harness And Ground Connector Terminals
      G07429823Courtesy of FORD MOTOR CO.
      • Is the resistance greater than 10,000 ohms? 
      1. Yes:  GO to 5  on page 4.
      2. No:  REPAIR circuit CET10 (BU/GY) for a short to ground. CLEAR the Diagnostic Trouble Codes (DTCs). TEST the system for normal operation.
  5. Check the Torque Converter Clutch (TCC) for a short to ground
    1. Measure the resistance between the transaxle internal harness connector, terminal 14 and ground.
      Fig 4: Measuring Resistance Between Transaxle Internal Harness Connector, Terminal 14 And Ground Connector Terminals
      G07429824Courtesy of FORD MOTOR CO.
      • Is the resistance less than 5 ohms? 
      1. Yes:  REMOVE the main control cover. REFER to MAIN CONTROL COVER . INSPECT the solenoid body for foreign material such as metal shavings on the exposed metal contacts or other components. CLEAR the solenoid body and RECHECK the resistance value. If the resistance value is out of specification and a short to ground is not found, INSTALL a new solenoid body assembly. REFER to SOLENOID BODY ASSEMBLY . PERFORM the Solenoid Body Strategy Data Download procedure. REFER to Solenoid Body Strategy Download. TEST the system for normal operation.
      2. No:  REPLACE the Powertrain Control Module (PCM). PROGRAM the Powertrain Control Module (PCM) with the latest calibration level. PERFORM the Solenoid Body Strategy Data Download procedure. REFER to Solenoid Body Strategy Download. TEST the system for normal operation.
  6. Check the Torque Converter Clutch (TCC) circuit for a short to voltage
    1. Ignition OFF.
    2. Disconnect the transaxle vehicle harness C168.
    3. Disconnect the Powertrain Control Module (PCM) C175T.
    4. Inspect the connectors for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
    5. Ignition ON.
    6. Measure for voltage on circuit CET10 (BU/GY) from the transaxle vehicle harness C168-14 to ground.
      Fig 5: Measuring Voltage Of Connector Terminals
      G07429825Courtesy of FORD MOTOR CO.
      • Is any voltage present? 
      1. Yes:  REPAIR circuit CET10 (BU/GY) for a short to voltage. CLEAR the Diagnostic Trouble Codes (DTCs). TEST the system for normal operation.
      2. No:  REPLACE the Powertrain Control Module (PCM). PROGRAM the Powertrain Control Module (PCM) with the latest calibration level. PERFORM the Solenoid Body Strategy Data Download procedure. REFER to Solenoid Body Strategy Download. TEST the system for normal operation.
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