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Home >> Lincoln >> 2013 >> Navigator L, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Four Wheel Drive (4WD) Systems) >> Diagnosis And Testing >> Four Wheel Drive (4WD) Systems - 1-Speed Torque-On-Demand >> Pinpoint Tests >> Pinpoint Test F: Four-Wheel Drive (4WD) System Jumps Out of Gear >> Pinpoint Test F: The 4WD System Jumps Out Of Gear

Pinpoint Test F: The 4WD System Jumps Out Of Gear

WARNING: This page is about a different variant/trim than selected.
  1. F1 CHECK FOR OBSTRUCTED IWE VENT LINES 
    • With the vehicle in NEUTRAL, position in 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 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? 
      1. Yes  : INSTALL new IWE vent lines as necessary. TEST the system for normal operation.
      2. No  : GO to F2.
  2. F2 CHECK THE MSS SWITCH POSITION (4X4_SW) PID 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: DataLogger - TCCM.
    • Drive the vehicle.
    • Dynamically monitor the 4X4_SW PID while driving the vehicle in each MSS position.
      MSS Position PID Status
      4X2 2WD
      4X4 AUTO Automatic
      4X4 4WD-HIGH
    • Does the PID always agree with the MSS position? 
      1. Yes  : GO to F3.
      2. No  : GO to PINPOINT TEST D .
  3. F3 CHECK THE 4WD INDICATORS 
    • Apply the brakes and 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 Instrument Cluster (IC) message center.
    • Observe the 4WD indicators in the Instrument Cluster (IC) while cycling through each MSS position.
    • Do the 4WD indicators match MSS switch positions? 
      1. Yes  : GO to PINPOINT TEST D .
      2. No  : GO to F4.
  4. F4 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? 
      1. Yes  : REFER to the Transfer Case Control Module (TCCM) DTC Chart  in this service information for diagnosis.
      2. 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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