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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 52 (Four-Wheel Drive Systems (ESOF) - F250-F550 Super Duty) >> Diagnosis And Testing >> Four-Wheel Drive Systems - Electronic Shift >> Functional Test - Electronic Shift >> Pinpoint Test C: Electronic Shift Functional Test

Pinpoint Test C: Electronic 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.
CAUTION: The function test must be carried out on a hard surface in a vacant area without traffic.
  1. C1 CHECK FOR 2WD INDICATED 
    • Make sure the hublocks are in the AUTO position.
    • Start the vehicle and allow to idle.
    • Apply the brake pedal and hold.
    • Shift the transmission to NEUTRAL.
    • Turn the mode select switch (MSS) to 2WD while holding the shift conditions.
    • Observe the 4x4 and 4x4 LOW indicators.
    • Are both indicators off? 
    • Yes  : GO to  C3.
    • No  : GO to C2.
  2. C2 CHECK FOR THE PRESENCE OF 4x4 
      CAUTION: Make sure there is a clear area behind the vehicle before backing up.
    • Shift the transmission to REVERSE and back the vehicle up 3 meters (10 feet) to relieve driveline wind-up.
    • Drive the vehicle forward for 3 meters (10 feet) and stop.
    • Press the brake pedal and hold.
    • Shift the transmission to NEUTRAL. Hold the shift conditions for 20 seconds.
    • Execute 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  : RETRIEVE 4WD Control Module self-test DTCs. If a self-test DTC related to the concern is retrieved, REFER to FOUR-WHEEL DRIVE (4WD) CONTROL MODULE  (GEM) Diagnostic Trouble Code (DTC) Index. If no DTC is retrieved, REFER to TRANSFER CASE and REPAIR the transfer case as necessary.
    • No  : If the 4x4 indicator is ON, GO to PINPOINT TEST E . If the 4x4 LOW indicator is ON, GO to PINPOINT TEST F .
  3. C3 CHECK INDICATOR PROVE-OUT 
    • Key in OFF position.
    • Turn the ignition switch to start and observe the 4x4 and 4x4 LOW indicators for prove-out.
    • Did the indicators prove out? 
    • Yes  : GO to C4.
    • No  : REPAIR the instrument cluster as necessary. REFER to INSTRUMENT CLUSTER .
  4. C4 VERIFY SHIFT TO 4x4 
    • Turn the MSS to 4x4.
    • Listen for relay clicks and gearmotor operation.
    • Wait for 20 seconds after the MSS is turned to 4x4. (The system will use up to five cycles of shift attempts trying to engage 4x4.)
    • Is the 4x4 indicator ON? 
    • Yes  : GO to  C6.
    • No  : GO to C5.
  5. C5 ATTEMPT MECHANICAL ASSIST ENGAGEMENT 
    • Drive the vehicle and coast for at least 20 seconds.
    • Stop the vehicle.
    • Observe the 4x4 indicator.
    • Is the 4x4 indicator ON? 
    • Yes  : GO to C6.
    • No  : RETRIEVE the 4WD control module self-test DTCs. If a self-test DTC related to the concern is retrieved, REFER to FOUR-WHEEL DRIVE (4WD) CONTROL MODULE  (GEM) Diagnostic Trouble Code (DTC) Index. If no DTC related to the concern is retrieved, GO to  C9.
  6. C6 CHECK FOR MECHANICAL ENGAGEMENT OF 4x4 
    • Drive the vehicle for two minutes above 16 km/h (10 mph).
    • Execute 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  C9.
    • No  : Four-wheel drive did not mechanically engage. RETRIEVE 4WD control module self-test DTCs. If a self-test DTC related to the concern is retrieved, REFER to FOUR-WHEEL DRIVE (4WD) CONTROL MODULE  (GEM) Diagnostic Trouble Code (DTC) Index. If no DTC related to the concern is retrieved, GO to C7.
  7. C7 CHECK FOR FRONT AXLE ENGAGEMENT 
    • Raise and support the front tires off the ground until they can be spun freely. Refer to JACKING AND LIFTING .
    • Rotate the left front tire one revolution forward and one revolution backward while observing the left front axle shaft and universal joint.
    • Rotate the right front tire one revolution forward and one revolution backward while observing the right front axle shaft and universal joint.
    • Did both front axle shafts rotate? 
  8. C8 CHECK FOR FRONT AXLE/DIFFERENTIAL ENGAGEMENT 
    • Rotate the front driveshaft.
    • Does either front axle shaft turn? 
  9. C9 VERIFY SHIFT TO 4x4 LOW 
    • With the vehicle in motion, turn the MSS to 4x4 LOW while observing the indicators for five seconds.
    • Is the 4x4 LOW indicator on? 
    • Yes  : GO to  C11.
    • No  : GO to C10.
  10. C10 ATTEMPT MECHANICAL ASSIST OF 4x4 LOW ENGAGEMENT 
      CAUTION: Make sure there is a clear area behind the vehicle before backing up.
    • Shift the transmission to REVERSE and back the vehicle up 3 meters (10 feet) to relieve driveline wind-up and stop.
    • Drive the vehicle forward for 3 meters (10 feet) and stop.
    • Apply the brake pedal and hold.
    • Shift the transmission to NEUTRAL. Hold all shift conditions for 20 seconds.
    • Observe the 4x4 LOW indicator.
    • Is the 4x4 LOW indicator ON? 
    • Yes  : GO to C11.
    • No  : RETRIEVE 4WD control module self-test DTCs. If a self-test DTC related to the concern is retrieved, REFER to FOUR-WHEEL DRIVE (4WD) CONTROL MODULE  (GEM) Diagnostic Trouble Code (DTC) Index. If no DTC related to the concern is retrieved, GO to PINPOINT TEST F .
  11. C11 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 reduced vehicle speed.
    • Is driveline wind-up, tire scuff and reduced speed present? 
    • Yes  : GO to C12.
    • No  : Four-wheel drive LOW did not mechanically engage. RETRIEVE 4WD control module self-test DTCs. If a self-test DTC related to the concern is retrieved, REFER to FOUR-WHEEL DRIVE (4WD) CONTROL MODULE  (GEM) Diagnostic Trouble Code (DTC) Index. If no DTC related to the concern is retrieved, GO to PINPOINT TEST F .
  12. C12 CHECK FOR CORRECT INDICATOR OPERATION ON 4x4 LOW DISENGAGEMENT 
    • While the vehicle is in motion, turn the MSS to 4x4 while observing the indicators.
    • Turn the MSS to 4x4 LOW.
    • Stop the vehicle and apply the parking brake.
    • For automatic transmission, shift the transmission to PARK and release the brake pedal. For manual transmission, shift the transmission to NEUTRAL and release the clutch pedal.
    • Is the 4x4 LOW indicator ON? 
    • Yes  : GO to C13.
    • No  : RETRIEVE 4WD control module self-test DTCs. If a self-test DTC related to the concern is retrieved, REFER to FOUR-WHEEL DRIVE (4WD) CONTROL MODULE  (GEM) Diagnostic Trouble Code (DTC) Index. If no DTC related to the concern is retrieved, GO to PINPOINT TEST F .
  13. C13 CHECK THE 4x4 LOW INDICATOR 
    • Turn the MSS to 4x4.
    • Apply and hold the brake pedal.
    • Is the 4x4 LOW indicator ON? 
    • Yes  : GO to C14.
    • No  : RETRIEVE 4WD control module self-test DTCs. If a self-test DTC related to the concern is retrieved, REFER to FOUR-WHEEL DRIVE (4WD) CONTROL MODULE  (GEM) Diagnostic Trouble Code (DTC) Index. If no DTC related to the concern is retrieved, GO to PINPOINT TEST I .
  14. C14 CHECK FOR 4x4 LOW INDICATOR OFF IN 4x4 
    • Press and hold the brake pedal.
    • Shift the transmission to NEUTRAL.
    • Listen for relay clicks and gearmotor operation.
    • Hold the shift conditions for 20 seconds. (The system will use up to five cycles of shift attempts trying to engage 4x4).
    • Is the 4x4 LOW indicator OFF? 
    • Yes  : GO to  C16.
    • No  : GO to C15.
  15. C15 ATTEMPT MECHANICAL ASSIST OF 4x4 LOW DISENGAGEMENT 
    • Drive the vehicle forward above 8 km/h (5 mph) for at least five seconds.
    • Stop the vehicle.
    • Apply the brake pedal and hold.
    • Shift the transmission to NEUTRAL. Hold all shift conditions for 20 seconds.
    • Observe the 4x4 LOW indicator.
    • Is the 4x4 LOW indicator OFF? 
  16. C16 CHECK FOR MECHANICAL 4x4 LOW DISENGAGEMENT AND 4x4 ENGAGEMENT 
    • Apply the brake.
      • CAUTION: Make sure there is a clear area behind the vehicle before backing up.
    • Shift the transmission to REVERSE and back the vehicle up 3 meters (10 feet) to relieve driveline wind-up.
    • Stop the vehicle.
    • Drive the vehicle forward and execute tight turns on a hard surface.
      • NOTE: Driveline wind-up and tire scuff is present in both 4x4 and 4x4 LOW. However, vehicle speed is severely limited in 4x4 LOW.
    • Verify the presence of driveline wind-up and tire scuff. Also verify the increased vehicle speed from when 4x4 LOW was engaged.
    • Did 4x4 engage and the vehicle speed increase? 
    • Yes  : GO to C17.
    • No  : Four-wheel drive LOW is mechanically bound or locked. Repair is the transfer case as necessary. REFER to TRANSFER CASE .
  17. C17 CHECK THE 4x4 TO 2WD SHIFT 
    • Stop the vehicle.
    • Turn the MSS to 2WD and wait 20 seconds.
    • Listen for relay clicks and gearmotor operation.
    • Are the 4x4 and 4x4 LOW indicators OFF? 
    • Yes  : GO to  C19.
    • No  : GO to C18.
  18. C18 ATTEMPT MECHANICAL ASSIST OF 4x4 DISENGAGEMENT 
    • Drive the vehicle and coast for at least 20 seconds.
    • Stop the vehicle.
    • Observe the 4x4 and 4x4 LOW indicators.
    • Are the 4x4 and 4x4 LOW indicators OFF? 
    • Yes  : GO to C19.
    • No  : RETRIEVE 4WD control module self-test DTCs. If a self-test DTC related to the concern is retrieved, REFER to FOUR-WHEEL DRIVE (4WD) CONTROL MODULE  (GEM) Diagnostic Trouble Code (DTC) Index. If no DTC related to the concern is retrieved, GO to PINPOINT TEST I .
  19. C19 VERIFY THE HUBLOCKS DISENGAGE 
    • Raise and support the front tires off the ground until they can be spun freely. Refer to JACKING AND LIFTING .
    • Rotate the left front tire one revolution forward and one revolution backward, while observing the left front axle shaft and universal joint.
    • Rotate the right front tire one revolution forward and one revolution backward, while observing the right front axle shaft and universal joint.
    • Did either axle shaft rotate? 
  20. C20 VERIFY THE TRANSFER CASE MECHANICALLY DISENGAGED 
    • Apply the parking brake.
    • Rotate the front driveshaft.
    • Does the front driveshaft turn? 
    • Yes  : GO to C21.
    • No  : The transfer case did not disengage from 4x4. REPAIR the transfer case as necessary. REFER to TRANSFER CASE .
  21. C21 VERIFY THE HUBLOCKS WILL LOCK MANUALLY 
    • Turn both hublocks to the LOCK position.
    • Rotate the left front tire one revolution forward and one revolution backward while observing the left front axle shaft and universal joint.
    • Rotate the right front tire one revolution forward and one revolution backward while observing the right front axle shaft and universal joint.
    • Do both axles rotate? 
    • Yes  : GO to C22.
    • No  : INSTALL a new hublock on the side that did not rotate. REFER to HUBLOCK  in this section.
  22. C22 VERIFY THE HUBLOCKS WILL UNLOCK MANUALLY 
    • Turn both hublocks to the AUTO position.
    • Rotate the left front tire one revolution forward and one revolution backward while observing the left front axle shaft and universal joint.
    • Rotate the right front tire one revolution forward and one revolution backward while observing the right front axle shaft and universal joint.
    • Does either axle rotate? 
    • Yes  : INSTALL a new hublock on the side that did not rotate. REFER to HUBLOCK  in this section.
    • No  : The transfer case is operating correctly. INSTRUCT the customer on correct system operation.
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