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Pinpoint Test E: Transaxle Solenoid Power Control Circuit

WARNING: This page is about a different car, the 2008 Mercury Sable, 2008 Ford Taurus X, and 2008 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to the Transaxle Vehicle Harness Connector illustration Transaxle Connector Layouts .
  1. E1 CHECK FOR VOLTAGE AT THE TRANSAXLE VEHICLE HARNESS C168 
    • Disconnect: Transaxle Vehicle Harness C168
    • Use a mirror to inspect both ends of the connector for damage or pushed-out pins, corrosion, loose wires and missing or damaged seals.
    • Key in ON position.
      • Fig 1: Measuring Voltage
      GF0031628Courtesy of FORD MOTOR CO.
    • Measure the voltage at the transaxle vehicle harness C168-15, circuit CET25 (BU/GN).
    • Is the voltage greater than 10 volts? 
    1. YES  : INSTALL a new solenoid body. REFER to Solenoid Body Assembly . RECONNECT all components. TEST the system for normal operation.
    2. NO  : Go to  E2 .
  2. E2 CHECK THE TRANSAXLE SOLENOID POWER CONTROL CIRCUIT FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: PCM Transaxle C175T
    • Measure the resistance between the PCM transaxle C175T-47, circuit CET25 (BU/GN) and transaxle vehicle harness C168-15, circuit CET25 (BU/GN).
      • Fig 2: Measuring Resistance
      GF0031629Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  E3.
    2. NO  : REPAIR circuit CET25 (BU/GN) for an open. RECONNECT all components. TEST the system for normal operation.
  3. E3 CHECK THE TRANSAXLE SOLENOID POWER CONTROL CIRCUIT FOR A SHORT TO GROUND 
    • Measure the resistance between the transaxle vehicle harness C168-15, circuit CET25 (BU/GN) and ground.
      • Fig 3: Measuring Resistance
      GF0031630Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS article. RECONNECT all components. TEST the system for normal operation.
    2. NO  : REPAIR circuit CET49 (BN) for a short to ground. RECONNECT all components. TEST the system for normal operation.
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