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Pinpoint Test F : DTC P0657

  1. Refer to Transmission Controls - 6F35 for schematic and connector information.

    Normal Operation and Fault Conditions 

    The transmission solenoid power control relay controls vehicle power to all solenoids. Power is routed through the transmission solenoid power control relay (inside the PCM) to all transmission solenoids. If the power circuit to the transmission solenoids or the transmission solenoid power control relay fails open, all solenoids are failed electrically off. Check for open, short to ground or the transmission connector disconnected. The transmission solenoid power control relay disables power to the transmission solenoids when certain transmission diagnostic trouble codes (DTCs) are set.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PCM P0657:00 Actuator Supply Voltage "A" Circuit/Open: No Sub Type Information Open circuit on the transmission solenoid power circuit.

    Possible Sources 

    • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
    • Transmission internal wiring harness frame
    • PCM

  2. F1 RETRIEVE AND RECORD ALL DTCS

    • Using the diagnostic scan tool, retrieve all diagnostic trouble codes (DTCs).

    Is DTC P0657 present? 

    Yes  GO to  F2
    No  REFER to: Diagnosis By Symptom .

  3. F2 CHECK THE TRANSMISSION SOLENOID POWER CONTROL CIRCUIT

    • Ignition OFF.

    • Disconnect Transmission Vehicle Harness C168A.

    • Inspect the connectors for damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C168A-5
      GFD304649Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  F5
    No  GO to  F3

  4. F3 CHECK THE TRANSMISSION SOLENOID POWER CONTROL CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect PCM C175E.

    • Inspect the connector for damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C168A-5
      GFD304648Courtesy of FORD MOTOR COMPANY
      		 C175E-91

    Is the resistance less than 3 ohms? 

    Yes  GO to  F4
    No  REPAIR the circuit.

  5. F4 CHECK THE TRANSMISSION SOLENOID POWER CONTROL CIRCUIT FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C168A-5
      GFD304648Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  F5
    No  REPAIR the circuit.

  6. F5 CHECK THE TRANSMISSION INTERNAL WIRING HARNESS FRAME

    • Remove the transmission internal wiring harness frame. REFER to: Transmission Internal Wiring Harness Frame . Inspect for metal shavings on the exposed metal contacts or other components and clean the solenoid and transmission internal wiring harness frame terminals.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      Transmission internal wiring harness frame pin 5.
      GFD304648Courtesy of FORD MOTOR COMPANY
      		 Transmission internal wiring harness frame all pin fives.

    Is the resistance less than 3 ohms? 

    Yes  Refer to PCM Guided Routine Testing .
    No  INSTALL a new transmission internal wiring harness frame. REFER to: Transmission Internal Wiring Harness Frame .
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