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Home >> Ford >> 2012 >> Mustang Base, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 144 (Four Wheel Drive (4WD) Systems -- F150) >> 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 2012 Ford Pickup. 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: DataLogger - 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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