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Home >> Ford >> 2021 >> Explorer Limited Hybrid, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Automatic Transmission - 10-Speed Automatic Transmission - 10R60 (1 Of 3)) >> Diagnosis And Testing >> DTC Chart and Pinpoint Tests - 2.3L EcoBoost (201kW/273PS) >> Pinpoint Tests >> Pinpoint Test E : DTCS P0C28, P0C29, P0C2A, P0C2C, P0C2D, P0C2E, P2796

Pinpoint Test E : DTCS P0C28, P0C29, P0C2A, P0C2C, P0C2D, P0C2E, P2796

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

    Normal Operation and Fault Conditions 

    The transmission fluid auxiliary pump keeps the transmission engaged when the engine is stopped and the transmission is in drive. The transmission fluid auxiliary pump has an internal microprocessor and communicates with the PCM over a PWM circuit with a frequency of 150 Hz and a duty cycle range of 10% to 90%.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PCM P0C28:00 Electric/Auxiliary Transmission Fluid Pump "A" Motor Current High: No Sub Type Information This DTC indicates the transmission fluid auxiliary pump communication is OK, the frequency is between 125 Hz and 175 Hz, but a high current is detected (20% to 25% duty cycle).
    PCM P0C29:00 Electric/Auxiliary Transmission Fluid Pump "A" Driver Circuit Performance: No Sub Type Information This DTC indicates the transmission fluid auxiliary pump communication is OK, the frequency is between 125 Hz and 175 Hz, but a high current is detected and the pump speed is out of range (75% to 80% duty cycle)
    PCM P0C2A:00 Electric/Auxiliary Transmission Fluid Pump "A" Motor Stalled: No Sub Type Information This DTC indicates the PCM commanded the transmission fluid auxiliary pump on but did not detect a corresponding increase in pump speed, indicating a stalled pump motor (35% to 40% duty cycle).
    PCM P0C2C:00 Electric Transmission Fluid Pump Control Module Feedback Signal Range/Performance: No Sub Type Information This DTC indicates the transmission fluid auxiliary pump frequency is between 125 and 175Hz but has an invalid duty cycle, or the frequency is outside of the 125-175Hz range. This can be caused by a loss of power to the transmission fluid auxiliary pump.
    PCM P0C2D:00 Electric Transmission Fluid Pump Control Module Feedback Signal Low: No Sub Type Information This DTC indicates the transmission fluid auxiliary pump duty cycle is less than 10%. This DTC can set while using output state control to command a pump speed outside of normal operating parameters.
    PCM P0C2E:00 Electric Transmission Fluid Pump Control Module Feedback Signal High: No Sub Type Information This DTC indicates the transmission fluid auxiliary pump duty cycle is greater than 90%. This DTC can set while using output state control to command a pump speed outside of normal operating parameters
    PCM P2796:00 Electric Transmission Fluid Pump Control Circuit: No Sub Type Information This DTC indicates the transmission fluid auxiliary pump is not receiving a command signal from the PCM (85% to 90% duty cycle).

    Possible Sources 

    • Connectors damaged or pushed-out terminals, corrosion, loose wires or ground and missing or damaged seals
    • BJB fuse 26 (15A)
    • Transmission internal wiring harness
    • Transmission fluid auxiliary pump
    • PCM

  2. E1 CHECK THE TRANSMISSION FLUID LEVEL

    Is the transmission fluid level correct? 

    Yes  GO to  E2
    No  CORRECT the transmission fluid to the proper level, CLEAR the DTCs and road test the vehicle. If DTCs return, GO to  E2

  3. E2 CHECK THE TRANSMISSION FLUID AUXILIARY PUMP VPWR CIRCUIT FOR VOLTAGE

    • Ignition OFF.

    • Disconnect Transmission Vehicle Harness C168A.

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

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C168A-10
      GFD514072Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  E3
    No  VERIFY the BJB fuse 26 (15A) is OK. If the fuse is OK, REFER to OEM Electrical Wiring Diagram Introduction to identify an open circuit. If the fuse is not OK, REFER to OEM Electrical Wiring Diagram Introduction to identify a short to ground.

  4. E3 CHECK THE TRANSMISSION FLUID AUXILIARY PUMP TASV CIRCUIT FOR VOLTAGE

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C168A-12
      GFD514072Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  E6
    No  GO to  E4

  5. E4 CHECK THE TRANSMISSION FLUID AUXILIARY PUMP TASV CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect PCM C1381E.

    • 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-12
      GFD514073Courtesy of FORD MOTOR COMPANY
      		 C1381E-95

    Is the resistance less than 3 ohms? 

    Yes  GO to  E5
    No  REPAIR the circuit.

  6. E5 CHECK THE TRANSMISSION FLUID AUXILIARY PUMP TASV CIRCUIT FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C168A-12
      GFD514073Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  Refer to PCM GUIDED ROUTINE TESTING
    After programming the new PCM, CARRY OUT the transmission strategy download. REFER to: Transmission Strategy Download .
    No  REPAIR the circuit.

  7. E6 CHECK THE TRANSMISSION FLUID AUXILIARY PUMP GROUND CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C168A-17
      GFD514073Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  E7
    No  REPAIR the circuit.

  8. E7 CHECK THE TRANSMISSION FLUID AUXILIARY PUMP ATFPC AND ATFPM CIRCUITS FOR AN OPEN

    • Ignition OFF.

    • Disconnect PCM C1381B.

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

    • Measure:

      ATFPC 

      Positive Lead Measurement / Action Negative Lead
      C168A-18
      GFD514073Courtesy of FORD MOTOR COMPANY
      		 C1381B-41

      ATFPM 

      Positive Lead Measurement / Action Negative Lead
      C168A-19
      GFD514073Courtesy of FORD MOTOR COMPANY
      		 C1381B-50

    Are the resistances less than 3 ohms? 

    Yes  GO to  E8
    No  REPAIR the circuit.

  9. E8 CHECK THE TRANSMISSION FLUID AUXILIARY PUMP ATFPC AND ATFPM CIRCUITS FOR A SHORT TO GROUND

    • Measure:

      ATFPC 

      Positive Lead Measurement / Action Negative Lead
      C168A-18
      GFD514073Courtesy of FORD MOTOR COMPANY
      		 Ground

      ATFPM 

      Positive Lead Measurement / Action Negative Lead
      C168A-19
      GFD514073Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  E9
    No  REPAIR the circuit.

  10. E9 CHECK THE TRANSMISSION CASE WIRING HARNESS ATFPC AND ATFPM CIRCUITS FOR AN OPEN

    • Ignition OFF.

    • Disconnect Transmission Fluid Auxiliary Pump C1792.

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

    • Measure:

      ATFPC 

      Positive Lead Measurement / Action Negative Lead
      GFD514074Courtesy of FORD MOTOR COMPANY

      Transmission component side, pin 18
      GFD514073Courtesy of FORD MOTOR COMPANY
      		 C1792-4

      ATFPM 

      Positive Lead Measurement / Action Negative Lead
      GFD514074Courtesy of FORD MOTOR COMPANY

      Transmission component side, pin 19
      GFD514073Courtesy of FORD MOTOR COMPANY
      		 C1792-5

    Are the resistances less than 3 ohms? 

    Yes  GO to  E10
    No  INSTALL a new transmission case wiring harness. REFER to: Transmission Internal Wiring Harness .

  11. E10 CHECK THE TRANSMISSION CASE WIRING HARNESS ATFPC AND ATFPM CIRCUITS FOR A SHORT TO GROUND

    • Measure:

      ATFPC 

      Positive Lead Measurement / Action Negative Lead
      C1792-4
      GFD514073Courtesy of FORD MOTOR COMPANY
      		 Ground

      ATFPM 

      Positive Lead Measurement / Action Negative Lead
      C1792-5
      GFD514073Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  E11
    No  INSTALL a new transmission case wiring harness. REFER to: Transmission Internal Wiring Harness .

  12. E11 CHECK THE TRANSMISSION CASE WIRING HARNESS TRANSMISSION FLUID AUXILIARY PUMP POWER CIRCUITS

    • Ignition OFF.

    • Connect Transmission Vehicle Harness C168A.

    • Connect PCM C1381E.

    • Connect BJB fuse 26 (15A) (if previously disconnected).

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1792-1
      GFD514072Courtesy of FORD MOTOR COMPANY
      		 Ground
      C1792-3
      GFD514072Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the voltages greater than 11 volts? 

    Yes  GO to  E12
    No  INSTALL a new transmission case wiring harness. REFER to: Transmission Internal Wiring Harness .

  13. E12 CHECK THE TRANSMISSION INTERNAL WIRING HARNESS TRANSMISSION FLUID AUXILIARY PUMP GROUND CIRCUIT

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1792-1
      GFD514072Courtesy of FORD MOTOR COMPANY
      		 C1792-6

    Is the voltage greater than 11 volts? 

    Yes  INSTALL a new transmission fluid auxiliary pump. REFER to: Transmission Fluid Auxiliary Pump .
    No  INSTALL a new transmission case wiring harness. REFER to: Transmission Internal Wiring Harness .
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