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Home >> Lincoln >> 2019 >> Nautilus Base, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Automatic Transmission - 8-Speed Automatic Transmission - 8F57 (2 Of 2)) >> Diagnosis And Testing >> DTC Chart and Pinpoint Tests - 2.7L EcoBoost (238kW/324PS) >> Pinpoint Tests >> Pinpoint Test A : Transmission Control Solenoids

Pinpoint Test A : Transmission Control Solenoids

WARNING: This page is about a different variant/trim than selected.
  1. Refer to Transmission Controls - 8F57 for schematic and connector information.

    Normal Operation and Fault Conditions 

    If the power circuit to the transmission solenoids fails open, then all solenoids are failed electrically off. Check for an open, short to ground or the transmission connector disconnected. The 8F24/57 transmissions utilize 5 shift solenoids (A, B, C, E, F) that are linear force solenoids (Solenoid D is for the selectable one way clutch). Unlike previous shift solenoids they are mechanical in nature meaning no transmission fluid passes through them. CIDASs use an armature pin assembly that moves a control valve in the main control valve body to control and apply hydraulic fluid pressure. Each clutch (A, B, C, E, F) has a corresponding shift solenoid (A, B, C, E, F) that is directly proportional in that zero current equals zero pressure and maximum current equals maximum pressure. Since there is no pressure with zero current, none of the clutch packs are able to engage if the power is interrupted to the shift solenoids.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PCM P0657:00 Actuator Supply Voltage "A" Circuit/Open: No Sub Type Information The transmission solenoid power control 1 (TSPC1) provides power to the shift solenoids B, E, and F, TCC, and LPC solenoids. The DTC sets when the PCM has detected an open circuit.
    PCM P0753:00 Shift Solenoid "A" Electrical: No Sub Type Information DTC P0753 illuminates the wrench light in conjunction with P0973, P0974, and/or P097A. Service the more specific DTC first.
    PCM P0754:00 Shift Solenoid "A" Intermittent: No Sub Type Information The PCM detected a SSA fault, but the fault did not last long enough for the PCM to set a more specific SSADTC. Inspect SSA wiring and connectors for damage.
    PCM P0758:00 Shift Solenoid "B" Electrical: No Sub Type Information DTC P0758 illuminates the wrench light in conjunction with P0976, P0977, and/or P097B. Service the more specific DTC first.
    PCM P0759:00 Shift Solenoid "B" Intermittent: No Sub Type Information DTC P0758 illuminates the wrench light in conjunction with P0976, P0977, and/or P097B. Service the more specific DTC first.
    PCM P0763:00 Shift Solenoid "C" Electrical: No Sub Type Information DTC P0763 illuminates the wrench light in conjunction with P0779, P097C, and/or P0980. Service the more specific DTC first.
    PCM P0764:00 Shift Solenoid "C" Intermittent: No Sub Type Information The PCM detected SSC fault, but the fault did not last long enough for the PCM to set a more specific SSCDTC. Inspect SSC wiring and connectors for damage.
    PCM P0773:00 Shift Solenoid "E" Electrical: No Sub Type Information DTC P0773 illuminates the wrench light in conjunction with P097E, P0985, P0986. Service the more specific DTC first.
    PCM P0774:00 Shift Solenoid "E" Intermittent: No Sub Type Information The PCM detected SSE fault, but the fault did not last long enough for the PCM to set a more specific SSEDTC. Inspect SSE wiring and connectors for damage.
    PCM P0973:00 Shift Solenoid "A" Control Circuit Low: No Sub Type Information This DTC indicates a short to ground in the SSA electrical. Since SSA shorted to ground causes SSA to be failed to high current (maximum pressure since SSA is directly proportional). A clutch is failed on.
    PCM P0974:00 Shift Solenoid "A" Control Circuit High: No Sub Type Information This DTC indicates a short to power in the SSA electrical. Since SSA shorted to power causes SSA to be failed to low current (minimum pressure since SSA is directly proportional). A clutch is failed off.
    PCM P0976:00 Shift Solenoid "B" Control Circuit Low: No Sub Type Information This DTC indicates a short to ground in the SSB electrical. Since SSB shorted to ground causes SSB to be failed to high current (maximum pressure since SSB is directly proportional). B clutch is failed on.
    PCM P0977:00 Shift Solenoid "B" Control Circuit High: No Sub Type Information This DTC indicates a short to power in the SSB electrical. Since SSB shorted to power causes SSB to be failed to low current (minimum pressure since SSB is directly proportional). B clutch is failed off.
    PCM P0979:00 Shift Solenoid "C" Control Circuit Low: No Sub Type Information This DTC indicates a short to ground in the SSC electrical. Since SSC shorted to ground causes SSC to be failed to high current (maximum pressure since SSC is directly proportional). C clutch is failed on.
    PCM P097A:00 Shift Solenoid "A" Control Circuit/Open: No Sub Type Information This DTC indicates a short to power in the SSA electrical. Since SSA shorted to power causes SSA to be failed to low current (minimum pressure since SSA is directly proportional). A clutch is failed off.
    PCM P097B:00 Shift Solenoid "B" Control Circuit/Open: No Sub Type Information This DTC indicates an open circuit in the SSB electrical. Since SSB shorted to power causes SSB to be failed to low current (minimum pressure since SSB is directly proportional). B clutch is failed off.
    PCM P097C:00 Shift Solenoid "C" Control Circuit/Open: No Sub Type Information This DTC indicates a short to power in the SSC electrical. Since SSC shorted to power causes SSC to be failed to low current (minimum pressure since SSC is directly proportional). C clutch is failed off.
    PCM P097E:00 Shift Solenoid "E" Control Circuit/Open: No Sub Type Information This DTC indicates a short to power in the SSE electrical. Since SSE shorted to power causes SSE to be failed to low current (minimum pressure since SSE is directly proportional). E clutch is failed off.
    PCM P097F:00 Shift Solenoid "F" Control Circuit/Open: No Sub Type Information This DTC indicates a short to power in the SSF electrical. Since SSF shorted to power causes SSF to be failed to low current (minimum pressure since SSF is directly proportional). F clutch is failed off.
    PCM P097F:00 Shift Solenoid "F" Control Circuit/Open: No Sub Type Information This DTC indicates a short to power in the SSF electrical. Since SSF shorted to power causes SSF to be failed to low current (minimum pressure since SSF is directly proportional). F clutch is failed off.
    PCM P0980:00 Shift Solenoid "C" Control Circuit High: No Sub Type Information This DTC indicates a short to power in the SSC electrical. Since SSC shorted to power causes SSC to be failed to low current (minimum pressure since SSC is directly proportional). C clutch is failed off.
    PCM P0985:00 Shift Solenoid "E" Control Circuit Low: No Sub Type Information This DTC indicates a short to ground in the SSE electrical. Since SSE shorted to ground causes SSE to be failed to high current (maximum pressure since SSE is directly proportional). E clutch is failed on.
    PCM P0986:00 Shift Solenoid "E" Control Circuit High: No Sub Type Information This DTC indicates a short to power in the SSE electrical. Since SSE shorted to power causes SSE to be failed to low current (minimum pressure since SSE is directly proportional). E clutch is failed off.
    PCM P0998:00 Shift Solenoid "F" Control Circuit Low: No Sub Type Information This DTC indicates a short to ground in the SSF electrical. Since SSF shorted to ground causes SSF to be failed to high current (maximum pressure since SSE is directly proportional). F clutch is failed on.
    PCM P0999:00 Shift Solenoid "F" Control Circuit High: No Sub Type Information This DTC indicates a short to power in the SSF electrical. Since SSF shorted to power causes SSF to be failed to low current (minimum pressure since SSF is directly proportional). E clutch is failed off.
    PCM P2669:00 Actuator Supply Voltage "B" Circuit/Open: No Sub Type Information The transmission solenoid power control 2 (TSPC2) provides power to the TCC and LPC solenoids. The PCM has detected an open circuit.
    PCM P2709:00 Shift Solenoid "F" Electrical: No Sub Type Information SSF (controls F clutch) VFS circuit failure non-MIL "sister" DTCs of P097F, P0998, P0999 used to illuminate the Wrench Light. If one of the more specific circuit codes is set, follow repair procedures for that code.
    PCM P2710:00 Shift Solenoid "F" Intermittent: No Sub Type Information The PCM detected SSF fault, but the fault did not last long enough for the PCM to set a more specific SSFDTC. Inspect SSF wiring and connectors for damage.

    Possible Sources 

    • Connectors damaged or pushed-out terminals, corrosion, loose wires or ground and missing or damaged seals
    • Shift solenoid
    • PCM

  2. A1 CHECK THE SOLENOID POWER CIRCUIT FOR VOLTAGE

    NOTE: Read and record all DTCs.

    • Ignition OFF.

    • Disconnect: Transmission Vehicle Harness C1575.

    • Ignition ON.

    • Measure:

      TSPC1, TSPC2 

      Positive Lead Measurement / Action Negative Lead
      C1575-3
      GFD425661Courtesy of FORD MOTOR COMPANY
      		 Ground
      C1575-2
      GFD425661Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the voltages greater than 11 volts? 

    Yes  GO to  A4
    No  GO to  A2

  3. A2 CHECK THE SOLENOID POWER CIRCUITS FOR AN OPEN

    • Ignition OFF.

    • Disconnect: PCM C1551T

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

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1575-3
      GFD425660Courtesy of FORD MOTOR COMPANY
      		 C1551T-1
      C1575-2
      GFD425660Courtesy of FORD MOTOR COMPANY
      		 C1551T-2

    Are the resistances less than 3 ohms? 

    Yes  GO to  A3
    No  INSTALL a new transmission vehicle harness. REFER to: Main Control Valve Body  .

  4. A3 CHECK THE SOLENOID POWER CIRCUIT FOR A SHORT TO GROUND

    • Positive Lead Measurement / Action Negative Lead
      C1551T-1
      GFD425660Courtesy of FORD MOTOR COMPANY
      		 Ground
      C1551T-2
      GFD425660Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms? 

    Yes  Refer to PCM Guided Routine .
    No  REPAIR the circuit.

  5. A4 CHECK SOLENOID CONTROL CIRCUITS FOR AN OPEN

    • Ignition OFF.

    • Disconnect: PCM C1551T

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

    • Measure the resistance of the solenoid control circuits using the following chart:
      Positive Lead Measurement / Action Negative Lead
      SSA C1551T-15
      GFD425660Courtesy of FORD MOTOR COMPANY
      		 C1575-24
      SSF C1551T-19
      GFD425660Courtesy of FORD MOTOR COMPANY
      		 C1575-10
      SSC C1551T-49
      GFD425660Courtesy of FORD MOTOR COMPANY
      		 C1575-27
      SSB C1551T-34
      GFD425660Courtesy of FORD MOTOR COMPANY
      		 C1575-12
      SSE C1551T-64
      GFD425660Courtesy of FORD MOTOR COMPANY
      		 C1575-26

    Is the resistance less than 3 ohms on the suspect circuit? 

    Yes  GO to  A5
    No  REPAIR the transmission vehicle harness circuit. CLEAR the DTCs.

  6. A5 CHECK SOLENOID CONTROL CIRCUITS FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      SSA C1551T-15
      GFD425660Courtesy of FORD MOTOR COMPANY
      		 Ground
      SSF C1551T-19
      GFD425660Courtesy of FORD MOTOR COMPANY
      		 Ground
      SSC C1551T-49
      GFD425660Courtesy of FORD MOTOR COMPANY
      		 Ground
      SSB C1551T-34
      GFD425660Courtesy of FORD MOTOR COMPANY
      		 Ground
      SSE C1551T-64
      GFD425660Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms on the suspect circuit? 

    Yes  GO to  A6
    No  REPAIR the transmission vehicle harness circuit. CLEAR the DTCs.

  7. A6 CHECK SOLENOID CONTROL CIRCUITS FOR A SHORT TOGETHER WITH THE POWER CIRCUITS

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  A7
    No  REPAIR the transmission vehicle harness circuit. CLEAR the DTCs.

  8. A7 CHECK TRANSMISSION INTERNAL WIRING HARNESS SOLENOID TSPC1 AND TSPC2 POWER CIRCUITS FOR AN OPEN

    • Drain the transmission fluid and remove the main control cover.

    • Disconnect shift solenoid connectors A through F.

    • Measure resistance of the suspect solenoid power circuit of the internal wiring harness, using the table below:
      Positive Lead Measurement / Action Negative Lead
      GFD427715Courtesy of FORD MOTOR COMPANY

      Transmission Harness Connector, component side, pin 24
      GFD425660Courtesy of FORD MOTOR COMPANY
      		 SSA C1843-2
      GFD427715Courtesy of FORD MOTOR COMPANY

      Transmission Harness Connector, component side, pin 12
      GFD425660Courtesy of FORD MOTOR COMPANY
      		 SSB C1844-2
      GFD427715Courtesy of FORD MOTOR COMPANY

      Transmission Harness Connector, component side, pin 27
      GFD425660Courtesy of FORD MOTOR COMPANY
      		 SSC C1845-2
      GFD427715Courtesy of FORD MOTOR COMPANY

      Transmission Harness Connector, component side, pin 26
      GFD425660Courtesy of FORD MOTOR COMPANY
      		 SSE C1847-2
      GFD427715Courtesy of FORD MOTOR COMPANY

      Transmission Harness Connector, component side, pin 10
      GFD425660Courtesy of FORD MOTOR COMPANY
      		 SSF C1848-2

    Is the resistance less than 3 ohms on the suspect circuit? 

    Yes  GO to  A8
    No  INSTALL a new internal wiring harness. REFER to: Main Control Valve Body  .

  9. A8 CHECK TRANSMISSION INTERNAL WIRING HARNESS SOLENOID POWER CIRCUITS TSPC1 AND TSPC2 FOR A SHORT TO GROUND

    • Inspect internal wiring harness for chafes or bare wires.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      GFD427715Courtesy of FORD MOTOR COMPANY

      Transmission Harness Connector, component side, pin 2
      GFD425660Courtesy of FORD MOTOR COMPANY
      		 Ground
      GFD427715Courtesy of FORD MOTOR COMPANY

      Transmission Harness Connector, component side, pin 3
      GFD425660Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  A9
    No  INSTALL a new internal wiring harness. REFER to: Main Control Valve Body  .

  10. A9 CHECK SOLENOID RESISTANCE

    • Disconnect the suspect solenoid connector and remove the suspect shift solenoid.

    • Measure and record the resistance of the suspected solenoid.

    Is the shift solenoid resistance between 4.8 and 5.4 ohms? 

    Yes  The issue could not be duplicated at this time. INSPECT all wiring harness connectors for fitment issues or intermittent connections.
    No  INSTALL a new solenoid for the solenoid that failed the resistance check. REFER to: Main Control Valve Body  .
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