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Home >> Ford >> 2009 >> Flex SE >> Repair and Diagnosis >> External Pages >> Different car >> Section 437 (Transfer Case - Four Wheel Drive (4WD) Systems -- F250-F550 Super Duty) >> Diagnosis And Testing >> Four Wheel Drive (4WD) Systems - Mechanical Shift >> Pinpoint Tests >> Pinpoint Test F: Mechanical Shift On Stop (MSOS) Functional Test >> Pinpoint Test F: Mechanical Shift On Stop (MSOS) Functional Test

Pinpoint Test F: Mechanical Shift On Stop (MSOS) Functional Test

WARNING: This page is about a different car, the 2006 Ford Pickup, 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: 4x4 high/low (4H/4L) is not intended for driving on hard/dry surfaces.
  1. F1 CHECK FOR 2H INDICATION 
    • Key in ON position.
    • Shift the transfer case shift lever to 2H.
    • Observe the 4x4 and Low Range indicators.
    • Are both indicators off? 

    Yes  : GO to F2.

    No  : GO to PINPOINT TEST A .

  2. F2 CHECK THE MANUAL HUBLOCK OPERATION 
    • Turn the LH and RH hublocks to the LOCK position.
    • Do the hublocks turn to the LOCK position? 

    Yes  : GO to F3.

    No  : INSTALL a new manual hublock as necessary. REFER to HUBLOCK . TEST the system for normal operation.

  3. F3 CHECK FOR MECHANICAL ENGAGEMENT IN 2H 
    • 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 PINPOINT TEST B .

    No  : GO to F4.

  4. F4 VERIFY THE SHIFT TO 4H 
    • Shift the transfer case shift lever to 4H.
    • Did the transfer case shift lever shift to the 4H position? 

    Yes  : GO to  F6.

    No  : GO to F5.

  5. F5 ATTEMPT TO MECHANICALLY ASSIST 4H SHIFT 
    • While rolling at speed below 5 kph (3 mph), shift the transmission to NEUTRAL.
    • Shift the transfer case shift lever to the 4H position while the vehicle is rolling at a speed below 5 km/h (3 mph).
    • Did the transfer case shift lever shift to the 4H position? 

    Yes  : GO to F6.

    No  : GO to PINPOINT TEST B .

  6. F6 CHECK MECHANICAL ENGAGEMENT OF 4H 
    • 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 F7.

    No  : GO to PINPOINT TEST B .

  7. F7 CHECK THE 4X4 INDICATOR 
    • Observe the 4x4 indicator.
    • Is the 4x4 indicator illuminated? 

    Yes  : GO to F8.

    No  : GO to PINPOINT TEST A .

  8. F8 VERIFY THE SHIFT TO 4L 
    • With the vehicle stationary, shift the transmission to NEUTRAL.
    • Shift the transfer case shift lever to 4L.
    • Did the transfer case shift lever shift to 4L? 

    Yes  : GO to  F10.

    No  : GO to F9.

  9. F9 ATTEMPT TO MECHANICALLY ASSIST A SHIFT TO 4L 
    • While rolling at speed below 5 kph (3 mph), shift the transmission to NEUTRAL.
    • Shift the transfer case shift lever to the 4L position while the vehicle is rolling at a speed below 5 km/h (3 mph).
    • Did the transfer case shift lever shift to the 4L position? 

    Yes  : GO to  F12.

    No  : GO to PINPOINT TEST C .

  10. F10 CHECK FOR MECHANICAL ENGAGEMENT OF 4L 
    • 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 F11.

    No  : GO to PINPOINT TEST C .

  11. F11 CHECK THE LOW RANGE INDICATOR 
    • Observe the Low Range indicator.
    • Is the Low Range indicator illuminated? 

    Yes  : GO to F12.

    No  : GO to PINPOINT TEST A .

  12. F12 CHECK THE SHIFT FROM 4L TO 2H 
    • With the vehicle stationary, shift the transmission to NEUTRAL.
    • Shift the transfer case shift lever to the 2H position.
    • Did the transfer case shift lever shift to the 2H position? 

    Yes  : GO to  F14.

    No  : GO to F13.

  13. F13 ATTEMPT TO MECHANICALLY ASSIST 4L DISENGAGEMENT 
    • Allow the vehicle to roll forward to eliminate shift blockage or driveline wind-up.
    • While rolling, shift the transmission to NEUTRAL.
    • Shift the transfer case shift lever to the 2H position at a vehicle speed below 5 km/h (3 mph).
    • Did the transfer case shift lever shift to the 2H position? 

    Yes  : GO to F14.

    No  : GO to PINPOINT TEST C .

  14. F14 CHECK THE MANUAL HUBLOCKS RETURN TO FREE 
    • Turn the LH and RH manual hublocks to FREE.
    • Will the hublocks turn to the FREE position? 

    Yes  : GO to F15.

    No  : INSTALL a new manual hublock. REFER to HUBLOCK . TEST the system for normal operation.

  15. F15 VERIFY THAT THE HUBLOCKS DISENGAGE IN THE FREE POSITION 
    • Lift and support the vehicle so that the front tires are a few inches off the ground. Refer to JACKING & LIFTING .
    • Rotate the LH front tire while observing the RH front axle shaft and universal joint.
    • Rotate the RH front tire while observing the RH front axle shaft and universal joint.
    • Does either axle shaft rotate? 

    Yes  : INSTALL a new manual hublock on the axle shaft that rotated. REFER to HUBLOCK . TEST the system for normal operation.

    No  : GO to F16.

  16. F16 VERIFY THAT THE TRANSFER CASE DISENGAGED MECHANICALLY 
    • Apply the parking brake.
    • Rotate the front driveshaft.
    • Does the front driveshaft rotate? 

    Yes  : The 4x4 system is operating correctly.

    No  : REPAIR the transfer case as necessary. REFER to TRANSFER CASE . TEST the system for normal operation.

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