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Home >> Ford >> 2012 >> Mustang Base, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 557 (Four Wheel Drive (4WD) Systems) >> Diagnosis And Testing >> Four Wheel Drive (4WD) Systems - Electronic Shift >> Pinpoint Tests >> Pinpoint Test E: The Transfer Case Jumps Out of Gear >> Pinpoint Test E: The Transfer Case Jumps Out Of Gear

Pinpoint Test E: The Transfer Case Jumps Out Of Gear

WARNING: This page is about a different car, the 2014 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: When directed to drive the vehicle as part of this test, drive the vehicle on a hard surface in an area without traffic to prevent a crash. Failure to follow these instructions may result in personal injury.
  1. E1 CHECK FOR OBSTRUCTED IWE VENT LINES 
    • With the vehicle in NEUTRAL, position it on a hoist. Refer to JACKING & LIFTING .
    • NOTE: The IWE  vent port is the smaller of the 2 vacuum ports.

      Disconnect the LH IWE  line from the vent port.

    • Attach a vacuum pump to the IWE  vent line and attempt to hold a vacuum.
    • Disconnect the RH IWE  line from the vent port.
    • Attach a vacuum pump to the IWE  vent line and attempt to hold a vacuum.

    Can a vacuum be held on either IWE vent line? 

    • Yes  : INSTALL new IWE  vent lines as necessary. TEST the system for normal operation.
    • No  : GO to E2  .
  2. E2 VERIFY THE CONCERN 
    • Drive the vehicle and attempt to duplicate the concern.

    Is the concern an uncommanded range shift (in or out of low range)? 

    • Yes  : GO to  E5.
    • No  : GO to E3  .
  3. E3 CHECK THE MSS POSITION MONITORING THE TCCM 4WD SWITCH STATUS (4X4_SW) PID 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Data Logger - TCCM  .
    • Drive the vehicle.
    • Dynamically monitor the 4X4_SW PID while driving the vehicle in each shift position.

    Does the 4X4_SW PID always agree with the switch position? 

  4. E4 CHECK FOR TCCM DTCs 
    • Enter the following diagnostic mode on the scan tool: Self-Test - TCCM  .

    Are any DTCs present? 

  5. E5 CHECK THE 4WD INDICATORS 
    • Stop the vehicle.
    • Transmission in NEUTRAL.
    • Depress the brake pedal.
    • Observe the 4WD  indication in the message center while cycling through each MSS  position.

    Does the 4WD indicator(s) match the MSS ? 

  6. E6 CHECK FOR TCCM DTCs 
    • Transmission in PARK.
    • Enter the following diagnostic mode on the scan tool: Self-Test - TCCM  .

    Are any DTCs present? 

    • Yes  : REFER to the TCCM DTC CHART .
    • No  : CHECK the transfer case fluid level. REFER to TRANSFER CASE . If the fluid level is OK,

      CHECK for internal transfer case faults. REFER to TRANSFER CASE .

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