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Home >> Ford >> 2003 >> Cutaway 7.3 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 2501 (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: Manual Shift-On-Stop (MSOS) Functional Test >> Pinpoint Test F: MSOS Functional Test

Pinpoint Test F: MSOS Functional Test

WARNING: This page is about a different car, the 2010 Ford Pickup, 2010 Ford F550 Super Duty, 2010 Ford F450 Super Duty, and 2010 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 
    • Ignition ON.
    • Shift the transfer case shift lever to 2H.
    • Observe the 4X4 and low range indicators.
    • Are both indicators off? 
  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? 
  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 8 km/h (5 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 8 km/h (5 mph).
    • Did the transfer case shift lever shift to the 4H position? 
  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? 
  7. F7 CHECK THE 4X4 INDICATOR 
    • Observe the 4X4 indicator.
    • Is the 4X4 indicator illuminated? 
  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 8 km/h (5 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 8 km/h (5 mph).
    • Did the transfer case shift lever shift to the 4L position? 
  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? 
  11. F11 CHECK THE 4X4 LOW RANGE INDICATOR 
    • Observe the low range indicator.
    • Is the low range indicator illuminated? 
  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 8 km/h (5 mph).
    • Did the transfer case shift lever shift to the 2H position? 
  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 U-joint.
    • Rotate the RH front tire while observing the RH front axle shaft and U-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 4WD  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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