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Home >> Ford >> 2022 >> Transit Connect Titanium, Gas/Ethanol >> Repair and Diagnosis >> External Pages >> Different car >> Section 346 (Four-Wheel Drive Systems (2 Of 2)) >> Diagnosis And Testing >> Four-Wheel Drive Systems - Raptor, Vehicles With: 4HI-LOC Torque on Demand Transfer Case >> Pinpoint Tests >> Pinpoint Test K : P1825, P1826 And P1827

Pinpoint Test K : P1825, P1826 And P1827

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 

    When the transfer case is in 4A mode, the TCCM provides a PWM voltage to the transfer case clutch field coil. The energized field coil moves a ball and ramp cam to engage a clutch as necessary to provide torque to the front axle.

    The TCCM 4WD clutch field coil driver monitors the 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 P1825:00 4-Wheel Drive Clutch Relay Open Circuit: No Sub Type Information This DTC sets when TCCM detects an open circuit. The TCCM disables transfer case clutch operation.
    TCCM P1826:00 4-Wheel Drive Low Clutch Relay Circuit To Battery: No Sub Type Information This DTC sets when TCCM detects a short to voltage. Transfer case clutch operation, though disabled by the TCCM, is fully engaged when this DTC is present.
    TCCM P1827:00 4-Wheel Drive Low Clutch Relay Circuit To Ground: No Sub Type Information This DTC sets when TCCM detects a short to ground. The TCCM disables transfer case clutch operation.

    Possible Sources 

    • Short to ground, Open, or Short to power on CLUTCH CTRL circuit
    • Transfer case clutch field coil

  2. K1 CHECK CLUTCH CONTROL CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Disconnect Transfer case C350.

    • Disconnect TCCM C2371B.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C350-2
      GFD464771Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  K2
    No  REPAIR the short to ground.

  3. K2 CHECK CLUTCH CONTROL CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Disconnect Transfer case C350.

    • Disconnect TCCM C2371B.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C350-2
      GFD464771Courtesy of FORD MOTOR COMPANY
      		 C2371B-10

    Is the resistance less than 3 ohms? 

    Yes  GO to  K3
    No  REPAIR the open circuit.

  4. K3 CHECK CLUTCH CONTROL CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.

    • Disconnect Transfer Case C350.

    • Disconnect TCCM C2371V.

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C350-2
      GFD464770Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the short to voltage.
    No  Replace field coil. REFER to: Transfer Case - Raptor, Vehicles With: 2-Speed Torque On Demand Transfer Case .
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