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Home >> Ford >> 2022 >> Expedition SSV, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Four-Wheel Drive Systems) >> Diagnosis And Testing >> DTC Chart and Pinpoint Tests - Vehicles With: 2-Speed Torque On Demand Transfer Case >> Pinpoint Tests >> Pinpoint Test C: Shift Motor - Electrical Or Mechanical Fault

Pinpoint Test C: Shift Motor - Electrical Or Mechanical Fault

WARNING: This page is about a different variant/trim than selected.
  1. Refer to FOUR WHEEL DRIVE SYSTEMS for schematic and connector information.

    Normal Operation and Fault Conditions 

    TRANSFER CASE SHIFT MOTOR STATUS: REFER to: Fuel System - Overview

    The electric shift motor is mounted externally to the transfer case. It drives a rotary cam which moves the range fork within the transfer case. The shift motor moves during shifts in to and out of 4L, and to Neutral. It does not move during the shift between 2H and 4A or 4A to 4H. TCCM directly controls the electric shift motor and can reverse motor polarity to reverse rotary cam/shift fork direction. The message center may display \"Shift in Progress\" while the shift motor is operating. The shift motor sense plate, an integral part of the shift motor assembly, informs the TCCM of the transfer case position. The sense plates are a set of 4 contacts that are opened and closed to represent each valid transfer case shift motor position.

    DTC Fault Trigger Conditions 

    DTC Description Fault Trigger Condition
    TCCM P1839:00 Transfer Case Shift Motor Open Circuit: No Sub Type Information This DTC sets when the TCCM detects an open circuit to the shift motor.
    TCCM P1840:00 Transfer Case Shift Motor Short Circuit To Battery: No Sub Type Information This DTC sets when TCCM detects a short to voltage. Shift motor moves are prevented when this DTC is set.
    TCCM P1841:00 Transfer Case Shift Motor Short Circuit To Ground: No Sub Type Information This DTC sets when TCCM detects a short to ground. Shift motor moves are prevented when this DTC is set.
    TCCM P1849:00 Transfer Case Contact Plate 'A' Short Circuit To Ground: No Sub Type Information This DTC sets when TCCM detects a short to ground. Shift motor moves are prevented when this DTC is set. The TCCM cannot complete mode change if a change in shift motor position is required.
    TCCM P184B:00 Transfer Case Unable To Transition Between 4x4 High and 4x4 Low Range: No Sub Type Information This DTC sets when target shift motor position is not reached after the maximum number of allowed blocked shift retries for 4H to 4L. Requested shift motor position is not reached.
    TCCM P1853:00 Transfer Case Contact Plate 'B' Short Circuit To Ground: No Sub Type Information This DTC sets when TCCM detects a short to ground. Shift motor moves are prevented when this DTC is set. The TCCM cannot complete mode change if a change in shift motor position is required.
    TCCM P1857:00 Transfer Case Contact Plate 'C' Short Circuit To Ground: No Sub Type Information This DTC sets when TCCM detects a short to ground. Shift motor moves are prevented when this DTC is set. The TCCM cannot complete mode change if a change in shift motor position is required.
    TCCM P1861:00 Transfer Case Contact Plate 'D' Short Circuit To Ground: No Sub Type Information This DTC sets when TCCM detects a short to ground. Shift motor moves are prevented when this DTC is set. The TCCM cannot complete mode change if a change in shift motor position is required.
    TCCM P1867:00 Transfer Case Contact Plate General Circuit Failure: No Sub Type Information This DTC sets when an invalid shift motor position is detected during selection of a new 4WD mode or during a motor movement. If the shift motor is not moving, shift motor movement is prevented. If the shift motor is moving when this DTC sets, the shift motor moves to the high-side mechanical stop.
    TCCM P1891:00 Transfer Case Contact Plate Ground Return Open Circuit: No Sub Type Information This DTC sets when TCCM detects a short to ground, a short to voltage or open circuit. The TCCM cannot complete mode change if a change in shift motor position is required.

    Possible Sources 

    • Wiring, terminals or connectors
    • Transfer case
    • TCCM
    • Shift Motor

  2. C1 CHECK FOR TCCM (TRANSFER CASE CONTROL MODULE) DTC (DIAGNOSTIC TROUBLE CODE)

    • Ignition ON.

    • Enter the following diagnostic mode on the scan tool: TCCM On Demand Self-Test.

    Did a shift motor on demand DTC set? 

    Yes  For DTC P1849:00, P1853:00, P1857:00, P1861:00, GO to  C2DTC P1867:00, GO to  C3. For DTC P1891:00, GO to  C5. For DTC P184B:00, GO to  C14. For DTC P1839:00, P1840:00, P1841:00, GO to  C8
    For all other DTC, Refer to the DTC Chart: TCCM.
    No  GO to  C14

  3. C2 CHECK TRANSFER PLATE CONTACT PLATE CIRCUITS FOR A SHORT TO GROUND

    • Ignition OFF.

    • Disconnect Transfer Case C350 .

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2371A-1
      GFD699631Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2371A-2
      GFD699631Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2371A-3
      GFD699631Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2371A-4
      GFD699631Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM, or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new transfer case shift motor. REFER to: Fuel System - Overview
    No  REPAIR the short to GND.

  4. C3 CHECK TRANSFER PLATE CONTACT PLATE CIRCUITS FOR A SHORT TO VOLTAGE

    • Disconnect Transfer Case C350 .

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2371A-1
      GFD699632Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2371A-2
      GFD699632Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2371A-3
      GFD699632Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2371A-4
      GFD699632Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the short to voltage.
    No  GO to  C4

  5. C4 CHECK THE TRANSFER PLATE CONTACT PLATE CIRCUITS FOR AN OPEN

    • Ignition OFF.

    • Disconnect Transfer Case C350 .

    Is the resistance less than 3 ohms? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM, or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new shift motor. REFER to: Fuel System - Overview
    No  REPAIR the open circuit.

  6. C5 CHECK TRANSFER PLATE CONTACT PLATE GROUND CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.

    • Disconnect Transfer Case C350 .

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2371A-5
      GFD699631Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  C6
    No  REPAIR the short to GND.

  7. C6 CHECK TRANSFER PLATE CONTACT PLATE GROUND CIRCUIT FOR A SHORT TO VOLTAGE

    • Disconnect Transfer Case C350 .

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2371A-5
      GFD699632Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the short to voltage.
    No  GO to  C7

  8. C7 CHECK THE TRANSFER PLATE CONTACT PLATE GROUND CIRCUIT FOR AN OPEN

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2371A-5
      GFD699631Courtesy of FORD MOTOR COMPANY
      		 C350-1

    Is the resistance less than 3 ohms? 

    Yes  CHECK OASIS for any applicable service articles: TSB, GSB, SSM, or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new shift motor. REFER to: Fuel System - Overview
    No  REPAIR the open circuit.

  9. C8 CHECK THE SHIFT MOTOR CIRCUITS FOR POWER WHILE COMMANDING THE TCCM (TRANSFER CASE CONTROL MODULE) CW RELAY (CW_SMD_OS) AND CCW RELAY (CCW_SMD_OS) PID ON

    • Disconnect Transfer Case C350 .

    • Ignition ON.

    • Enter the following diagnostic mode: TCCM Datalogger.

    • Command the PID CW_SMD_OS and CCW_SMD_OS) ON and OFF while measuring the voltages:

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C350-3
      GFD699632Courtesy of FORD MOTOR COMPANY
      		 Ground
      C350-4
      GFD699632Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the voltages 11 volts or greater on the circuits when commanding the PIDs ON? 

    Yes  END the active commands, GO to  C11
    No  END the active commands, GO to  C9

  10. C9 CHECK THE TCCM (TRANSFER CASE CONTROL MODULE) VOLTAGE CIRCUITS

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2371B-6
      GFD699632Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2371B-7
      GFD699632Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage greater than 11 volts? 

    Yes  GO to  C10
    No  VERIFY BCMB fuses are OK. If OK, REPAIR the circuit. If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify possible causes of the circuit short.

  11. C10 CHECK THE TRANSFER CASE CONTROL MODULE GROUND

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2371B-1
      GFD699631Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2371B-3
      GFD699631Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance less than 3 ohms? 

    Yes  GO to  C11
    No  REPAIR the open circuit.

  12. C11 CHECK THE TRANSFER CASE SHIFT MOTOR CIRCUITS FOR AN OPEN

    • Disconnect Transfer Case C350 .

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C350-4
      GFD699631Courtesy of FORD MOTOR COMPANY
      		 C2371B-5
      C350-3
      GFD699631Courtesy of FORD MOTOR COMPANY
      		 C2371B-4

    Is the resistance less than 3 ohms? 

    Yes  GO to  C12
    No  REPAIR the open circuit.

  13. C12 CHECK THE TRANSFER CASE SHIFT MOTOR CIRCUITS FOR SHORT TO VOLTAGE

    • Ignition ON.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C350-4
      GFD699632Courtesy of FORD MOTOR COMPANY
      		 Ground
      C350-3
      GFD699632Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the short to voltage.
    No  GO to  C13

  14. C13 CHECK THE TRANSFER CASE SHIFT MOTOR CIRCUITS FOR SHORT TO GROUND

    • Ignition OFF.

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C350-4
      GFD699631Courtesy of FORD MOTOR COMPANY
      		 Ground
      C350-3
      GFD699631Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  C14
    No  REPAIR the short to ground.

  15. C14 CHECK THE TRANSFER CASE SHIFT MOTOR OPERATION

    • Remove the transfer case shift motor from the transfer case, leaving the wiring connector connected.

    • Observe the transfer case shift motor while switching the 4X4 switch module from 2H to 4L.

    Does the transfer case shift motor rotate from the 2H position to the 4L position? 

    Yes  INSPECT transfer case for internal damage.
    No  CHECK OASIS for any applicable service articles: TSB, GSB, SSM, or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new transfer case shift motor. REFER to: Fuel System - Overview
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