FixVault
Home › Ford › 2005 › Expedition RWD › Repair and Diagnosis › External Pages › Different variant/trim › Section 1 (Four-Wheel Drive Systems) › Diagnosis And Testing › Four-Wheel Drive Systems › Pinpoint Tests › Pinpoint Test H: Torque On-Demand Functional Test › Testing

Pinpoint Test H: Torque On-Demand Functional Test: Testing

WARNING: This page is about a different variant/trim than selected.
NOTE: 4x4 high/low (4H/4L) is not intended for driving on hard/dry surfaces.
  1. H1 CHECK FOR 4x4 INDICATOR PROVE OUT 
    • Key in OFF position.
    • Key in ON position.
    • Do the 4x4 indicators illuminate at prove out? 
    • Yes  : GO to H2.
    • No  : CHECK the instrument cluster for faults. REFER to INSTRUMENT CLUSTER .
  2. H2 CHECK 2WD OPERATION 
    • Stop the vehicle.
    • Transmission in NEUTRAL.
    • Depress the brake pedal.
    • Switch the MSS to 2H.
    • Do the 4WD indicators turn off? 
    • Yes  : GO to  H5.
    • No  : GO to H3.
  3. H3 CHECK FOR DTCs 
    • Transmission in PARK.
    • Release the brake pedal.
    • Connect the diagnostic tool.
    • Carry out the on-demand self test.
    • Are DTCs retrieved? 
  4. H4 CHECK FOR WIND-UP IN 2WD 
    • Drive the vehicle on a dry, hard surface while executing turns.
    • Is wind-up present in turns? 
  5. H5 CHECK FOR WIND-UP IN 2WD 
    • Drive the vehicle on a dry, hard surface while executing turns.
    • Is wind-up present in turns? 
  6. H6 CHECK A4WD OPERATION 
    • Switch the MSS to A4WD.
    • Are the 4WD indicators off? 
    • Yes  : GO to  H9.
    • No  : GO to H7.
  7. H7 CHECK FOR DTCs 
    • Connect the diagnostic tool.
    • Carry out the on-demand self test.
    • Are DTCs present? 
  8. H8 CHECK FOR WIND-UP IN A4WD 
    • Drive the vehicle on a dry, hard surface in turns.
    • Is wind-up present in turns? 
    • Yes  : GO to H9.
    • No  : GO to  H10.
  9. H9 CHECK THE TRANSFER CASE CLUTCH DUTY CYCLE PID 
    • Enter the following diagnostic mode on the diagnostic tool: PID/DATA Monitor and Record.
    • Monitor the transfer case clutch duty cycle (pulse width modulated [PWM]) PID.
    • Does the PID indicate two to 4 percent clutch application at closed throttle? 
    • Yes  : GO to H10.
    • No  : GO to  H11.
  10. H10 CHECK FOR WIND-UP IN A4WD WITH 100 PERCENT CLUTCH 
    • Using the diagnostic tool, command the clutch duty cycle to 100 percent.
    • Drive the vehicle on a dry, hard surface in turns. 
    • Is wind-up present in turns? 
  11. H11 CHECK SHAFT SPEED PIDs 
    • Enter the following diagnostic mode on the diagnostic tool: PID/DATA Monitor and Record.
    • Monitor the transfer case front and rear shaft speeds.
    • Drive the vehicle 30 km/h (18 mph).
    • Record and compare the front wheel speed and rear wheel speed.
    • Do the front shaft speed and rear shaft speed values match within 1.5 km/h (1 mph)? 
    • Yes  : GO to H12.
    • No  : CHECK anti-lock brake system (ABS). REFER to ANTI-LOCK CONTROL and VERIFY the four road tire sizes match.
  12. H12 CHECK THE THROTTLE POSITION PID 
    • Enter the following diagnostic mode on the diagnostic tool: PID/DATA Monitor and Record.
    • Monitor the throttle position PID from the 4x4 module.
    • Key on, engine off.
    • Slowly move throttle from closed throttle to WOT and observe the 4x4 module throttle sensor PID.
    • Does the PID value vary between 0 percent at closed throttle and 100 percent at WOT? 
  13. H13 CHECK 4H OPERATION 
    • Switch the MSS to 4H.
    • Does the 4H indicator illuminate correctly? 
    • Yes  : GO to  H16.
    • No  : GO to H14.
  14. H14 CHECK FOR DTCs 
    • Transmission in PARK.
    • Release the brake pedal.
    • Connect the diagnostic tool.
    • Carry out the on-demand self test.
    • Are DTCs retrieved? 
  15. H15 CHECK FOR WIND-UP IN 4H 
    • Drive the vehicle on a dry, hard surface while executing turns.
    • Is wind-up present in turns? 
  16. H16 CHECK FOR 4H WIND-UP 
    • Drive the vehicle on a dry, hard surface.
    • Is straightline wind-up present? 
  17. H17 CHECK 4H WIND-UP IN TURNS 
    • Drive the vehicle in 4H while turning.
    • Is wind-up present in turns? 
  18. H18 CHECK 4L OPERATION 
    • Bring the vehicle to a stop with the brake applied, transmission in NEUTRAL, switch the MSS to 4L.
    • Does the 4WD low indicator illuminate correctly? 
    • Yes  : GO to  H21.
    • No  : GO to H19.
  19. H19 CHECK FOR DTCs 
    • Transmission in PARK.
    • Release the brake pedal.
    • Connect the diagnostic tool.
    • Carry out the on-demand self test.
    • Are DTCs retrieved? 
  20. H20 CHECK FOR WIND-UP IN 4L 
    • Drive the vehicle on a dry, hard surface while executing turns.
    • Is wind-up present in turns? 
  21. H21 CHECK FOR 4L WIND-UP IN TURNS 
    • Drive the vehicle on a dry, hard surface while executing turns.
    • Is wind-up present and 4L functioning? 
  22. H22 CHECK 4L TO 2H SHIFT 
    • With the vehicle at a stop, brake applied and transmission in NEUTRAL, switch the MSS from 4L to 2H.
    • Do the 4WD indicators turn OFF? 
    • Yes  : GO to  H25.
    • No  : GO to H23.
  23. H23 CHECK FOR DTCs 
    • Transmission in PARK.
    • Release the brake pedal.
    • Connect the diagnostic tool.
    • Carry out the on-demand self test.
    • Are DTCs retrieved? 
  24. H24 CHECK FOR WIND-UP IN 2WD 
    • Drive the vehicle on a dry, hard surface while executing turns.
    • Is wind-up present in turns? 
  25. H25 CHECK FOR TRANSFER CASE DISENGAGEMENT 
    • Raise and support the vehicle on a hoist. Refer to JACKING & LIFTING .
    • Rotate the rear driveshaft while observing the front driveshaft.
    • Does the front driveshaft rotate? 
  26. H26 CHECK FOR LH AND RH IWE DISENGAGEMENT 
    NOTE: The engine must be at idle during the following steps to supply vacuum for IWE engagement/disengagement.
    • Start the engine and allow to idle.
    • Rotate the left front tire one revolution forward and one revolution backward while observing the left front halfshaft and universal joint.
    • Rotate the right front tire one revolution forward and one revolution backward while observing the right front halfshaft and universal joint.
    • Does the LH or RH front halfshaft rotate? 
  27. H27 CHECK FOR IWE VACUUM LEAKS 
    • Key in OFF position.
    • Disconnect both vacuum lines from the IWE solenoid.
    • Using a vacuum pump, apply 508 mm (20 in) Hg of vacuum to the IWE apply vacuum circuit.
    • Observe the vacuum reading.
    • Did the vacuum drop more than 25 mm (1 in) Hg per minute? 
    • Yes  : CHECK the IWE and related components for leaks. Go to PINPOINT TEST B .
    • No  : GO to H28.
  28. H28 CHECK 2H TO 4H SHIFT AT SPEED ABOVE 32 KM/H (20 MPH) 
    • Switch the MSS to 2H.
    • Drive the vehicle on the road and shift from 2H to 4H while driving above 32 km/h (20 mph).
    • Does the transfer case shift to 4H satisfactorily? 
    • Yes  : The 4x4 system is functioning correctly.
    • No  : Go to PINPOINT TEST E .
About FixVault