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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 - 2-Speed Torque-On-Demand >> Pinpoint Tests >> Pinpoint Test R: The Four-Wheel Drive (4WD) System Jumps Out of Gear >> Pinpoint Test R: The 4WD System Jumps Out Of Gear

Pinpoint Test R: The 4WD System 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.
  1. R1 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 hand vacuum pump to the IWE  vent line.
    • Attempt to draw and hold a vacuum.
    • Connect the LH IWE  line.
    • Disconnect the RH IWE  line from the vent port.
    • Attempt to draw and 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 R2  .
  2. R2 CHECK 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.
    • Monitor the 4X4_SW PID while driving the vehicle in each MSS  position.
      MSS Position PID Status
      2H 2-W Drive
      4A A4WD
      4H 4W Auto/Hi
      4L 4W Low

    Does the PID always agree with the MSS position? 

  3. R3 CHECK THE 4WD INDICATORS 
    • Stop the vehicle.
    • Shift the transmission into the NEUTRAL position.
    • NOTE: 2H is indicated by the absence of 4X4 AUTO, 4H or 4L mode indicators in the IPC  message center.

      Observe the 4WD  indicators in the IPC  while cycling through each MSS  position.

    Do the 4WD indicators match MSS switch positions? 

  4. R4 CHECK FOR TCCM DTCs 
    • Shift the transmission into the PARK position.
    • Enter the following diagnostic mode on the scan tool: Self-Test - TCCM  .

    Are DTCs present? 

    • Yes  : REFER to the TCCM DTC CHART  for diagnosis.
    • 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 . TEST the system for normal operation.
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