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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 860 (Transfer Case - Four Wheel Drive (4WD) Systems - F-150 & Mark LT) >> Diagnostic Tests >> Four Wheel Drive (4WD) Systems - Electronic Shift >> Pinpoint Tests >> Pinpoint Test O: The Four Wheel Drive (4WD) System Jumps Out of Gear >> Pinpoint Test O: The Four Wheel Drive (4WD) System Jumps Out Of Gear

Pinpoint Test O: The Four Wheel Drive (4WD) System Jumps Out Of Gear

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. O1 CHECK FOR OBSTRUCTED IWE VENT LINES 
    • With the vehicle in NEUTRAL, position it on a hoist. Refer to JACKING AND LIFTING article.
      • 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.
    • Attempt to draw and hold a vacuum. Repeat Steps 1-3 for the RH side of the vehicle.
    • Can a vacuum be held on either IWE vent line? 
    1. YES  : INSTALL new IWE vent lines as necessary.
    2. NO  : Go to  O2.
  2. O2 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)? 
    1. YES  : Go to  O5.
    2. NO  : Go to  O3.
  3. O3 CHECK THE MODE SELECT SWITCH (MSS) POSITION PIDS 
    • Key in OFF position.
    • Connect the diagnostic tool.
    • Key in ON position.
    • Drive the vehicle.
    • Dynamically monitor the MSS PID while driving the vehicle in each shift position.
    • Does the MSS PID always agree with the switch position? 
    1. YES  : Go to  O4.
    2. NO  : Go to Pinpoint Test L .
  4. O4 CHECK FOR DTCs 
    • Carry out the on-demand self test.
    • Are DTCs present? 
    1. YES  : REFER to the Four Wheel Drive (4WD) Control Module (PCM) Diagnostic Trouble Code (DTC) Chart .
    2. NO  : Go to Pinpoint Test Q .
  5. O5 CHECK THE 4WD INDICATORS 
    • Stop the vehicle.
    • Transmission in NEUTRAL.
    • Depress the brake pedal.
    • Observe the 4WD indicators in the instrument cluster while cycling through each MSS position.
    • Do the 4WD indicators match MSS switch positions? 
    1. YES  : Go to  O3.
    2. NO  : Go to  O6.
  6. O6 CHECK FOR DTCs 
    • Transmission in PARK.
    • Release the brake pedal.
    • Carry out the on-demand self test.
    • Are DTCs present? 
    1. YES  : REFER to the Four Wheel Drive (4WD) Control Module (PCM) Diagnostic Trouble Code (DTC) Chart .
    2. NO  : CHECK the transfer case fluid level. REFER to TRANSFER CASE article. If the fluid level is OK, CHECK for internal transfer case faults. REFER to TRANSFER CASE article.
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