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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 130 (Four-Wheel Drive Systems (ESOF) - F250-F550 Super Duty) >> Diagnosis And Testing >> Four-Wheel Drive Systems - Mechanical Shift >> Functional Test - Mechanical Shift >> PINPOINT TEST B: 4x4 WILL NOT ENGAGE

PINPOINT TEST B: 4x4 WILL NOT ENGAGE

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. B1 INSPECT THE DRIVESHAFT 
    • Visually inspect the front driveshaft.
    • Is the front driveshaft in place and correctly attached? 
    • Yes  : GO to B2.
    • No  : REPAIR the front driveshaft as necessary. REFER to DRIVESHAFT .
  2. B2 VERIFY HUBLOCK 
    • Shift the transfer case selector lever to the 2WD position.
    • Lift and support the vehicle so the front tires are a few inches off the ground. Refer to JACKING AND LIFTING .
    • Turn both hublocks to the LOCK position.
    • Rotate the left front tire while observing the left front axle shaft and universal joint.
    • Rotate the right front tire while observing the right front axle shaft and universal joint.
    • Do both axle shafts rotate? 
    • Yes  : GO to B3.
    • No  : INSTALL a new hublock on the axle that did not rotate. REFER to HUBLOCK  in this section.
  3. B3 CHECK THE FRONT DRIVE AXLE OPERATION 
    • Manually rotate the front driveshaft while observing the front tire rotation.
    • Does either front tire turn? 
  4. B4 VERIFY TRANSFER CASE ENGAGEMENT 
    • Shift the transfer case selector lever to 4x4.
    • Engage the parking brake.
    • Rotate the front driveshaft.
    • Does the front driveshaft turn? 
    • Yes  : GO to B5.
    • No  : The 4x4 system is operating correctly. INSTRUCT the customer on correct operation.
  5. B5 CHECK THE SHIFT LINKAGE 
    • Disconnect the transfer case shift linkage.
      • NOTE: The transfer case has four detented shift positions. The full clockwise position is 2WD, the next position is 4x4, then NEUTRAL and the full counterclockwise position is 4x4 LOW. Normal operation should not take more than 45 Nm (33 lb-ft) to manually shift the transfer case.
    • Manually shift the transfer case into 4x4.
    • Rotate the front driveshaft.
    • Does the front driveshaft turn? 
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