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Home >> Ford >> 2021 >> Explorer Limited Hybrid, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 731 (Automatic Transmission - 10-Speed Automatic Transmission - 10R80 (1 Of 2)) >> Diagnosis And Testing >> DTC Chart and Pinpoint Tests - 3.0L EcoBoost >> Pinpoint Tests >> Pinpoint Test E : TCC, LPC Solenoids

Pinpoint Test E : TCC, LPC Solenoids

WARNING: This page is about a different car, the 2021 Ford Police Interceptor Utility. However, it is still accessible from the selected car via links, so may be relevant.
  1. Refer to Transmission Controls for schematic and connector information.

    Normal Operation and Fault Conditions 

    When the electrical connector or solenoid is disconnected, inspect the connector for terminal condition, corrosion and contamination and the connector seal for damage. Clean, repair or install new components as required. 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 TCC is controlled by a directly proportional solenoid. Like the shift solenoids the TCC solenoid is controlled by a smart driver capable of detecting open, short to ground and short to power faults. In the event of an open circuit or short to power fault the TCC circuit is failed open. The TCC and LPC solenoids share a high side driver. Anytime power is removed the transmission defaults to MAX line pressure with open TCC. LPC is controlled by an inversely proportional solenoid (0 current = max pressure, max current = min line pressure). The LPC solenoid is controlled by a "smart driver" capable of detecting an open, short to ground or short to power faults.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PCM P0740:00 Torque Converter Clutch Solenoid Circuit/Open: No Sub Type Information This DTC sets if the PCM detects an open in the TCC solenoid circuitry.
    PCM P0743:00 Torque Converter Clutch Solenoid Circuit Electrical: No Sub Type Information This DTC sets if the fault was not present long enough for the PCM to determine a more specific fault. If more specific DTCs such as P0740 or P2769 are set resolve them first.
    PCM P0748:00 Pressure Control Solenoid "A" Electrical: No Sub Type Information This DTC sets if the fault was not present long enough for the PCM to determine a more specific fault. If more specific DTCs such as P0960, P0962 or P0963 are set resolve them first.
    PCM P0960:00 Pressure Control Solenoid "A" Control Circuit/Open: No Sub Type Information This DTC sets if the PCM detects an open in the pressure control solenoid circuitry or in the pressure control solenoid.
    PCM P0961:00 Pressure Control Solenoid "A" Control Circuit Range/Performance: No Sub Type Information This DTC sets if the PCM detects a short to ground, a short to power or an open in the pressure control solenoid circuitry or a short or open in the pressure control solenoid.
    PCM P0962:00 Pressure Control Solenoid "A" Control Circuit Low: No Sub Type Information This DTC sets if the PCM detects a short to ground in the pressure control solenoid circuitry or a short in the pressure control solenoid.
    PCM P0963:00 Pressure Control Solenoid "A" Control Circuit High: No Sub Type Information This DTC sets if the PCM detects a short to power in the pressure control solenoid circuitry.
    PCM P2760:00 Torque Converter Clutch Pressure Control Solenoid Intermittent: No Sub Type Information This DTC sets if the fault was not present long enough for the PCM to determine more specific fault. If a more specific DTC is set resolve it first.
    PCM P2769:00 Torque Converter Clutch Circuit Low: No Sub Type Information This DTC sets if the PCM detects a short to ground in the TCC circuitry or a short in the TCC solenoid.
    PCM P2770:00 Torque Converter Clutch Circuit High: No Sub Type Information This DTC sets if the PCM detects a short to ground in the TCC circuitry or an open or short to voltage in the TCC solenoid circuitry.

    Possible Sources 

    • Circuit open or shorted
    • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
    • TCC or LPC solenoid
    • Transmission internal wiring harness
    • PCM

  2. E1 CHECK THE TRANSMISSION SOLENOID POWER CONTROL 2 (TSPC2) CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect Transmission vehicle harness C168A.

    • 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
      C1551T-1
      GFD514679Courtesy of FORD MOTOR COMPANY
      		 C168A-11

    Is the resistance less than 3 ohms? 

    Yes  GO to  E2
    No  REPAIR the open circuit.

  3. E2 CHECK THE TRANSMISSION SOLENOID POWER CONTROL 2 (TSPC2) CIRCUIT FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1551T-1
      GFD514679Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  E3
    No  REPAIR the circuit short to ground.

  4. E3 CHECK THE SOLENOID CONTROL CIRCUITS FOR AN OPEN

    • Measure the resistance of the suspect solenoid control circuit using the following chart.
      Positive Lead Measurement / Action Negative Lead
      LPC Solenoid C1551T-63
      GFD514679Courtesy of FORD MOTOR COMPANY
      		 C168A-24
      TCC Solenoid C1551T-79
      GFD514679Courtesy of FORD MOTOR COMPANY
      		 C168A-25

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

    Yes  GO to  E4
    No  REPAIR the open circuit.

  5. E4 CHECK THE SOLENOID CONTROL CIRCUITS FOR A SHORT TO GROUND

    • Measure the resistance of the suspect solenoid control circuit to ground using the following chart:
      Positive Lead Measurement / Action Negative Lead
      LPC Solenoid C1551T-63
      GFD514679Courtesy of FORD MOTOR COMPANY
      		 Ground
      TCC Solenoid C1551T-79
      GFD514679Courtesy of FORD MOTOR COMPANY
      		 Ground

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

    Yes  GO to  E5
    No  REPAIR the circuit short to ground.

  6. E5 CHECK THE TRANSMISSION INTERNAL WIRING HARNESS SOLENOID CIRCUITS FOR A SHORT TO GROUND

    • Disconnect LPC C1840.

    • Disconnect TCC C1841.

    • Connect Transmission Vehicle Harness C168A.

    • For the LPC solenoid, measure:
      Positive Lead Measurement / Action Negative Lead
      C1551T-63
      GFD514679Courtesy of FORD MOTOR COMPANY
      		 Ground
      C1551T-1
      GFD514679Courtesy of FORD MOTOR COMPANY
      		 Ground

    • For the TCC solenoid, measure:
      Positive Lead Measurement / Action Negative Lead
      C1551T-79
      GFD514679Courtesy of FORD MOTOR COMPANY
      		 Ground
      C1551T-1
      GFD514679Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms on the suspect circuits? 

    Yes  GO to  E6
    No  INSTALL a new transmission internal wiring harness (both pieces). REFER to: Transmission Internal Wiring Harness .

  7. E6 CHECK THE TRANSMISSION INTERNAL WIRING HARNESS SOLENOID CIRCUITS FOR AN OPEN

    • For the LPC solenoid, measure:
      Positive Lead Measurement / Action Negative Lead
      C1551T-63
      GFD514679Courtesy of FORD MOTOR COMPANY
      		 C1840-2
      C1551T-1
      GFD514679Courtesy of FORD MOTOR COMPANY
      		 C1840-1

    • For the TCC solenoid, measure:
      Positive Lead Measurement / Action Negative Lead
      C1551T-79
      GFD514679Courtesy of FORD MOTOR COMPANY
      		 C1841-2
      C1551T-1
      GFD514679Courtesy of FORD MOTOR COMPANY
      		 C1841-1

    Are the resistances less than 3 ohms on the suspect circuits? 

    Yes  INSTALL a new solenoid. REFER to: Shift Solenoids (SS) .
    No  INSTALL a new transmission internal wiring harness (both pieces). REFER to: Transmission Internal Wiring Harness .
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