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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 A: Mechanical Shift Functional Test

Pinpoint Test A: Mechanical Shift Functional Test

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. A1 CHECK FOR 2WD INDICATED 
    • With the vehicle stationary, make sure the transmission is in NEUTRAL with your foot on the brake pedal.
    • Key in ON position.
    • Shift the transfer case selector lever to 2WD.
    • Observe both the 4x4 and 4x4 LOW indicators.
    • Are both indicators off? 
  2. A2 CHECK THE HUBLOCK OPERATION 
    • Turn the hublocks to the LOCK position.
    • Can the hublocks turn to the LOCK position? 
    • Yes  : GO to A3.
    • No  : INSTALL a new hublock as necessary. REFER to HUBLOCK  in this section.
  3. A3 VERIFY SHIFT TO 4x4 
    • With the vehicle stationary, shift the transmission to NEUTRAL.
    • Shift the transfer case selector lever to the 4x4 position.
    • Did the transfer case selector lever shift to the 4x4 position? 
    • Yes  : GO to  A5.
    • No  : GO to A4.
  4. A4 ATTEMPT TO MECHANICALLY ASSIST 4x4 SHIFT 
    • Allow the vehicle to roll forward.
    • Shift the transfer case selector lever to the 4x4 position.
    • Did the transfer case selector lever shift to the 4x4 position? 
    • Yes  : GO to A5.
    • No  : 4x4 will not engage. GO to SYMPTOM CHART .
  5. A5 CHECK FOR MECHANICAL ENGAGEMENT OF 4x4 
    • Drive the vehicle in tight turns on a hard surface.
    • Check for the presence of driveline wind-up and tire scuff.
    • Is driveline wind-up and tire scuff present? 
    • Yes  : GO to A6.
    • No  : 4x4 did not mechanically engage. GO to PINPOINT TEST B .
  6. A6 CHECK THE 4x4 INDICATOR 
    • Observe the 4x4 indicator.
    • Is the 4x4 indicator illuminated? 
  7. A7 VERIFY SHIFT TO 4x4 LOW 
    • Apply the brake.
    • With the vehicle stationary, shift the transmission to NEUTRAL.
    • Shift the transfer case selector lever to 4x4 LOW.
    • Did the transfer case selector lever shift to 4x4 LOW? 
    • Yes  : GO to  A9.
    • No  : GO to A8.
  8. A8 ATTEMPT TO MECHANICALLY ASSIST 4x4 LOW SHIFT 
    • Allow the vehicle to roll forward.
    • Shift the transfer case selector lever to the 4x4 LOW position.
    • Did the transfer case selector lever shift to the 4x4 LOW position? 
    • Yes  : GO to A9.
    • No  : 4x4 LOW will not engage. GO to SYMPTOM CHART .
  9. A9 CHECK FOR MECHANICAL ENGAGEMENT OF 4x4 LOW 
      NOTE: Driveline wind-up and tire scuff is present in both 4x4 and 4x4 LOW. However, vehicle speed is severely limited in 4x4 LOW.
    • Execute tight turns on a hard surface.
    • Check for the presence of driveline wind-up, tire scuff and limited vehicle speed.
    • Is driveline wind-up and tire scuff present? 
    • Yes  : GO to A10.
    • No  : 4x4 LOW did not mechanically engage. GO to SYMPTOM CHART .
  10. A10 CHECK THE 4x4 LOW INDICATOR 
    • Observe the 4x4 LOW indicator.
    • Is the 4x4 LOW indicator illuminated? 
  11. A11 CHECK THE SHIFT FROM 4x4 LOW TO 2WD 
    • With the vehicle stationary, shift the transfer case selector lever to the 2WD position.
    • Did the selector lever shift to the 2WD position? 
    • Yes  : GO to  A13.
    • No  : GO to A12.
  12. A12 ATTEMPT TO MECHANICALLY ASSIST 4x4 LOW DISENGAGEMENT 
    • Allow the vehicle to roll forward to eliminate blockage or driveline wind-up.
    • Shift the transfer case selector lever to the 2WD position.
    • Did the selector lever shift to 2WD position? 
    • Yes  : GO to A13.
    • No  : 4x4 LOW will not disengage. GO to SYMPTOM CHART .
  13. A13 CHECK THE HUBLOCK RETURN TO FREE 
    • Turn the hublocks to FREE.
    • Will the hublocks turn to the FREE position? 
    • Yes  : GO to A14.
    • No  : INSTALL a new hublock. REFER to HUBLOCK  in this section.
  14. A14 VERIFY HUBLOCKS WILL DISENGAGE IN THE FREE POSITION 
    • Lift and support the vehicle so the front tires are a few inches off the ground. Refer to JACKING AND LIFTING .
    • 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.
    • Does either axle shaft rotate? 
    • Yes  : INSTALL a new hublock on the axle that rotated. REFER to HUBLOCK  in this section
    • No  : GO to A15.
  15. A15 VERIFY THE TRANSFER CASE MECHANICALLY DISENGAGED 
    • Engage the parking brake.
    • Rotate the front driveshaft.
    • Does the front driveshaft rotate? 
    • Yes  : The 4x4 system is operating correctly. INSTRUCT the customer on correct operation.
    • No  : The transfer case did not disengage. REPAIR the transfer case as necessary. REFER to TRANSFER CASE .
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