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Pinpoint Test B: Transmission Fluid Heater Coolant Control Valve

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  1. Refer to TRANSMISSION CONTROLS - 10R80 for schematic and connector information.

    Normal Operation and Fault Conditions 

    The transmission fluid heater coolant control valve is an electrically controlled solenoid that allows or bypasses the flow of engine coolant through the transmission fluid cooler. This electrically controlled valve is normally open when not energized. The valve receives fused battery voltage when the ignition is in the run or start position and is grounded by the PCM via a low side driver. The PCM monitors the solenoid and circuits for electrical faults and sets an appropriate DTC.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    PCM P2681:00 Engine Coolant Bypass Valve "A" Control Circuit/Open: No Sub Type Information This DTC indicates an open circuit in the transmission fluid heater coolant control valve circuit.
    PCM P2682:00 Engine Coolant Bypass Valve "A" Control Circuit Low: No Sub Type Information This DTC indicates an open circuit or a short to ground in the transmission fluid heater coolant control valve circuit.
    PCM P2683:00 Engine Coolant Bypass Valve "A" Control Circuit High: No Sub Type Information This DTC indicates a short to power in the transmission fluid heater coolant control valve circuit.

    Possible Sources 

    • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
    • Circuit open or shorted
    • BJB fuse
    • Transmission fluid heater coolant control valve
    • PCM

  2. B1 CHECK THE TRANSMISSION FLUID HEATER COOLANT CONTROL VALVE POWER CIRCUIT FOR VOLTAGE

    • Disconnect Transmission fluid heater coolant control valve C1702.

    • Inspect the connector for damaged or pushed out terminals.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1702-1
      GFD559498Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  B2
    No  CHECK BJB fuse F8 (10A). If the fuse is OK, REFER to the OEM WIRING DIAGRAMS to identify and repair an open circuit. If the fuse is not OK, REFER to the OEM WIRING DIAGRAMS to identify and repair a short to ground.

  3. B2 CHECK THE TRANSMISSION FLUID HEATER COOLANT CONTROL VALVE CONTROL CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect PCM C1232T (for vehicles equipped with the 2.7L EcoBoost engine).

    • Disconnect PCM C1551T (for vehicles equipped with the 3.3L Duratec - V6 engine).

    • Disconnect PCM C175T (for vehicles equipped with the 3.5L EcoBoost engine).

    • Disconnect PCM C1381T (for vehicles equipped with the 5.0L 32V TiVCT engine).

    • Disconnect PCM C1233E (for vehicles equipped with the 3.0L Diesel engine).

    • Inspect the connector for damaged or pushed out terminals.

    • Measure:

      2.7L EcoBoost Engine 

      Positive Lead Measurement / Action Negative Lead
      C1702-2
      GFD559497Courtesy of FORD MOTOR COMPANY
      		 C1232T-76

      3.3L Duratec - V6 Engine 

      Positive Lead Measurement / Action Negative Lead
      C1702-2
      GFD559497Courtesy of FORD MOTOR COMPANY
      		 C1551T-76

      3.5L EcoBoost Engine 

      Positive Lead Measurement / Action Negative Lead
      C1702-2
      GFD559497Courtesy of FORD MOTOR COMPANY
      		 C175T-76

      5.0L 32V TiVCT Engine 

      Positive Lead Measurement / Action Negative Lead
      C1702-2
      GFD559497Courtesy of FORD MOTOR COMPANY
      		 C1381T-76

      3.0L Diesel Engine 

      Positive Lead Measurement / Action Negative Lead
      C1702-2
      GFD559497Courtesy of FORD MOTOR COMPANY
      		 C1233E-88

    Is the resistance less than 3 ohms? 

    Yes  GO to  B3
    No  REPAIR the open circuit.

  4. B3 CHECK THE TRANSMISSION FLUID HEATER COOLANT CONTROL VALVE CONTROL CIRCUIT FOR A SHORT TO GROUND

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1702-2
      GFD559497Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  INSTALL a new transmission fluid heater coolant control valve. For vehicles equipped with a 3.0L Diesel engine, REFER to: Transmission Fluid Heater Coolant Control Valve . For vehicles equipped with a 2.7L EcoBoost engine, REFER to: Transmission Fluid Heater Coolant Control Valve . For vehicles equipped with a 3.3L Duratec - V6 engine, REFER to: Transmission Fluid Heater Coolant Control Valve . For vehicles equipped with a 3.5L EcoBoost engine, REFER to: Transmission Fluid Heater Coolant Control Valve . For vehicles equipped with a 5.0L 32V TiVCT engine, REFER to: Transmission Fluid Heater Coolant Control Valve .
    No  REPAIR the short to ground.
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