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Home >> Ford >> 2022 >> Transit Connect Titanium, Gas/Ethanol >> Repair and Diagnosis >> External Pages >> Different car >> Section 671 (Automatic Transmission - 10-Speed Automatic Transmission - 10R80 MHT (Diagnosis & Testing - Installation)) >> Diagnosis And Testing >> DTC Chart and Pinpoint Tests - 3.5L V6 PowerBoost (CN) >> Pinpoint Tests >> Pinpoint Test E: Transmission Fluid Auxiliary Pump Circuit Diagnostics

Pinpoint Test E: Transmission Fluid Auxiliary Pump Circuit Diagnostics

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
  1. Refer to Wiring Diagrams TRANSMISSION CONTROLS - 10R80 for schematic and connector information.

    Normal Operation and Fault Conditions 

    The transmission fluid auxiliary pump keeps the transmission fluid circulating and the transmission engaged during auto start-stop events. The transmission fluid auxiliary pump has an internal microprocessor and communicates with the PCM via LIN serial communication.

    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, but a high current is detected.
    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, but a high current is detected and the pump speed is out of range.
    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.
    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.
    PCM U0287:00 Lost Communication With Transmission Fluid Pump Module "A": No Sub Type Information This DTC indicates the PCM did not receive LIN messages from the transmission fluid auxiliary pump for longer than 10 seconds.

    Possible Sources 

    • Low transmission fluid level
    • BJB fuse
    • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
    • Circuit open or shorted
    • 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 DTC and road test the vehicle. If the DTC returns, 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
      GFD559498Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  E3
    No  VERIFY the BJB fuse F67 (20A) is OK. If the fuse is OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify and repair an open circuit. If the fuse is not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify and repair 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
      GFD559498Courtesy 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 C175T.

    • 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
      GFD559497Courtesy of FORD MOTOR COMPANY
      		 C175T-32

    Is the resistance less than 3 ohms? 

    Yes  GO to  E5
    No  REPAIR the open 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
      GFD559497Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  Refer to PCM GUIDED ROUTINE TESTING
    Internet Explorer version 11 or greater is required to perform this Pinpoint Test. 
    After programming the new PCM, CARRY OUT the transmission strategy download. REFER to: Transmission Strategy Download .
    No  REPAIR the short to ground.

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

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C168A-17
      GFD559497Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  E7
    No  INSPECT ground G104. If the ground is clean and tight, REPAIR the open circuit.

  8. E7 CHECK THE TRANSMISSION FLUID AUXILIARY PUMP LIN (LOCAL INTERCONNECT NETWORK) CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect PCM C175TB.

    • 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-18
      GFD559497Courtesy of FORD MOTOR COMPANY
      		 C175B-49

    Is the resistance less than 3 ohms? 

    Yes  GO to  E8
    No  REPAIR the open circuit.

  9. E8 CHECK THE TRANSMISSION FLUID AUXILIARY PUMP LIN (LOCAL INTERCONNECT NETWORK) CIRCUIT FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C168A-18
      GFD559497Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  E9
    No  REPAIR the short to ground.

  10. E9 CHECK THE TRANSMISSION FLUID AUXILIARY PUMP LIN (LOCAL INTERCONNECT NETWORK) CIRCUIT FOR A SHORT TO POWER

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C168A-18
      GFD559498Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the short to power.
    No  GO to  E10

  11. E10 CHECK THE TRANSMISSION CASE WIRING HARNESS LIN (LOCAL INTERCONNECT NETWORK) CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect Transmission Fluid Auxiliary Pump C1717.

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

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1717-3
      GFD559497Courtesy of FORD MOTOR COMPANY
      GFD559499Courtesy of FORD MOTOR COMPANY

      Transmission component side, pin 18

    Is the resistance less than 3 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 LIN (LOCAL INTERCONNECT NETWORK) CIRCUIT FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1717-3
      GFD559497Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

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

  13. E12 CHECK THE TRANSMISSION CASE WIRING HARNESS TRANSMISSION FLUID AUXILIARY PUMP POWER CIRCUITS

    • Ignition OFF.

    • Connect Transmission vehicle harness C168A.

    • Connect PCM C175B.

    • Connect PCM C175T.

    • Connect BJB fuse F67 (20A) (if previously disconnected).

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1717-1
      GFD559498Courtesy of FORD MOTOR COMPANY
      		 Ground
      C1717-2
      GFD559498Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the voltages greater than 11 volts? 

    Yes  GO to  E13
    No  INSTALL a new transmission case wiring harness. REFER to: Transmission Internal Wiring Harness .

  14. E13 CHECK THE TRANSMISSION CASE WIRING HARNESS TRANSMISSION FLUID AUXILIARY PUMP GROUND CIRCUIT

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1717-1
      GFD559498Courtesy of FORD MOTOR COMPANY
      		 C1717-4

    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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