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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).
      • Was Diagnostic Trouble Code (DTC) P0657 set? 
      1. Yes:  GO to 2  on page 2.
      2. No:  REFER to SYMPTOM CHART: AUTOMATIC TRANSMISSION - 6F50 AND 6F55 .
  2. Check the transaxle solenoid power control circuit.
    1. Ignition OFF.
    2. Disconnect the transaxle vehicle harness C168.
    3. Inspect the connector for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
    4. Ignition ON.
    5. Measure the voltage on circuit CET25 (BU/GN) from the transaxle vehicle harness C168-15 to ground.
      Fig 1: Measuring Voltage Of Connector Terminals
      G07429852Courtesy of FORD MOTOR CO.
      • Is the voltage greater than 9.8 volts? 
      1. Yes:  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.
      2. No:  GO to 3  on page 3.
  3. Check the transaxle solenoid power control circuit for an open
    1. Ignition OFF.
    2. Disconnect the Powertrain Control Module (PCM) C175T.
    3. Inspect the connector for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.
    4. Measure the resistance of circuit CET25 (BU/GN) from the transaxle vehicle harness C168-15 to the Powertrain Control Module (PCM) C175T-50.
      Fig 2: Measuring Resistance Of Connector Terminals
      G07429853Courtesy of FORD MOTOR CO.
      • Is the resistance less than 5 ohms? 
      1. Yes:  GO to 4  on page 3.
      2. No:  REPAIR circuit CET25 (BU/GN) for an open. CLEAR the Diagnostic Trouble Code (DTC). TEST the system for normal operation.
  4. Check the transaxle solenoid power control circuit for a short to ground
    1. Measure the resistance of circuit CET25 (BU/GN) from the transaxle vehicle harness C168-15 to ground.
      Fig 3: Measuring Resistance Of Connector Terminals
      G07429854Courtesy of FORD MOTOR CO.
      • Is the resistance greater than 10,000 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:  REPAIR circuit CET25 (BU/GN) for a short to ground. CLEAR the Diagnostic Trouble Code (DTC). TEST the system for normal operation.
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