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Pinpoint Test E : IWE Solenoid - Electrical Fault

WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
  1. Refer to TWO WHEEL DRIVE/FOUR WHEEL DRIVE SYSTEMS for schematic and connector information.

    Normal Operation and Fault Conditions 

    The IWE solenoid receives power from the BJB. In 2H, the TCCM will ground the IWE solenoid to allow vacuum to pass through the solenoid and to the IWE. The TCCM IWE solenoid driver monitors the IWE ground circuit for open circuit, short to power, and short to ground. If an electrical fault is detected, the TCCM will store a DTC.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    TCCM C1979:11 IWE Solenoid Circuit Failure: Circuit Short To Ground This DTC sets when the TCCM detects a short to ground in the IWE solenoid circuit. The fault results in IWE disengaged all the time.
    TCCM C1979:12 IWE Solenoid Circuit Failure: Circuit Short To Battery This DTC sets when the TCCM detects a short to voltage in the IWE solenoid circuit. The fault results in IWE engaged all the time.
    TCCM C1979:13 IWE Solenoid Circuit Failure: Circuit Open This DTC sets when the TCCM detects an open circuit in the IWE solenoid circuit. The fault results in IWE engaged all the time.

    Possible Sources 

    • IWE control circuit shorted to voltage
    • IWE control circuit shorted to ground
    • IWE control open circuit
    • IWE solenoid
    • IWE solenoid power open circuit
    • IWE solenoid power circuit short to ground
    • TCCM

  2. E1 CHECK THE IWE SOLENOID CONTROL CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect IWE C1291.

    • Disconnect TCCM C2371A.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1291-2
      GFD464770Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the short to power
    No  GO to  E2

  3. E2 CHECK THE IWE SOLENOID CONTROL CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1291-2
      GFD464771Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  E4
    No  REPAIR the short to ground.

  4. E3 CHECK THE IWE SOLENOID CONTROL CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect IWE solenoid C1291.

    • Disconnect TCCM C2371A.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1291-2
      GFD464771Courtesy of FORD MOTOR COMPANY
      		 C2371A-6

    Is the resistance less than 3 ohms? 

    Yes  GO to  E4
    No  REPAIR the open circuit.

  5. E4 CHECK THE IWE SOLENOID RESISTANCE

    NOTE: If the temperatures (either ambient or in the engine compartment) are exceptionally high, a higher than normal resistance reading could result. A lower temperature could result in a lower resistance reading.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      GFD464768Courtesy of FORD MOTOR COMPANY

      Pin 1, component side.
      GFD464771Courtesy of FORD MOTOR COMPANY
      GFD464768Courtesy of FORD MOTOR COMPANY

      Pin 2, component side.

    Is the resistance between 44 and 70 ohms? 

    Yes  GO to  E5
    No  INSTALL a new IWE solenoid.

  6. E5 CHECK FOR VOLTAGE TO THE IWE SOLENOID

    • Ignition OFF.

    • Disconnect IWE solenoid C1291.

    • Connect TCCM C2371A.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C1291-1
      GFD464770Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  E6
    No  CHECK BJB fuse. If OK, REPAIR the open circuit. If not OK, REPAIR the short to ground. INSTALL a new fuse.

  7. E6 CHECK FOR CORRECT TCCM OPERATION

    • Ignition OFF.

    • Disconnect and inspect TCCM connectors.

    • Disconnect and inspect IWE solenoid connector.

    • Check for the following:

      • corrosion (install new connector or terminals - clean module pins)

      • damaged or bent pins - install new terminals/pins

      • pushed-out pins - install new pins as necessary

    • Connect all TCCM and IWE solenoid connectors. Make sure they seat and latch correctly.

    • Operate the system and verify the concern is still present.

    Is the concern still present? 

    Yes  INSTALL a new TCCM. REFER to: Transfer Case Control Module (TCCM) .
    No  The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. ADDRESS the root cause of the connector or pin issues.
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