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Pinpoint Test J : Four-Wheel Drive (4WD) System Functional Test

WARNING: This page is about a different car, the 2017 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: 4X4 High and 4X4 Low are not intended for driving on hard/dry surfaces; using these modes while driving on these surfaces may produce noises like intermittent clunking, but does not damage driveline components.

  1. J1 CHECK 2H MODE OPERATION

    • Shift the transmission into the NEUTRAL position.

    • Switch the MSS to 2H mode.

    Are there any 4WD mode indicators present in the IPC message center? 

    Yes  GO to  J2
    No  GO to  J4

  2. J2 CHECK FOR TCCM DTCS

    • Shift the transmission into the PARK position.

    • Ignition ON.

    • Enter the following diagnostic mode: TCCM Self-test.

    Are DTCs retrieved? 

    Yes  REFER to DTC Chart: TCCM .
    No  GO to  J3

  3. J3 CHECK FOR WIND-UP IN 2H MODE

    • Drive the vehicle on a dry, hard surface while executing turns.

    Is wind-up present in turns? 

    Yes  GO to Pinpoint Test E 
    No  To diagnose the 4X4 mode indicators do not operate correctly/do not operate, REFER to: Instrumentation, Message Center and Warning Chimes .

  4. J4 CHECK AUTO MODE OPERATION

    • Switch the MSS to 4A mode.

    Is the 4X4 auto (4A) mode indicator on in the IPC message center? 

    Yes  GO to  J7
    No  GO to  J5

  5. J5 CHECK FOR TCCM DTCS

    • Ignition ON.

    • Enter the following diagnostic mode: TCCM Self-Test.

    Are DTCs present? 

    Yes  REFER to DTC Chart: TCCM .
    No  GO to  J6

  6. J6 CHECK FOR WIND-UP IN 4A MODE

    • Drive the vehicle on a dry, hard surface, executing turns while applying the throttle.

    Is wind-up present in turns? 

    Yes  GO to  J7
    No  GO to  J8

  7. J7 CHECK THE TCCM 4WD PWM CLUTCH STATUS (4WD_CLTCH_OS) PID

    • Enter the following diagnostic mode: TCCM DataLogger.

    • Monitor the 4WD_CLTCH_OS PID.

    Does the PID indicate 0% to 10% clutch application at closed throttle? 

    Yes  GO to  J8
    No  GO to  J9

  8. J8 CHECK FOR WIND-UP IN 4A MODE WITH 100% CLUTCH DUTY CYCLE

    • Enter the following diagnostic mode: TCCM DataLogger.

    • Command the 4WD_CLTCH_OS to 100%.

    • Drive the vehicle on a dry, hard surface, executing turns.

    Is wind-up present in turns? 

    Yes  GO to  J9
    No  CHECK the transfer case. REFER to: Transfer Case .

  9. J9 CHECK THE TCCM AVERAGE FRONT WHEEL SPEED

    • Enter the following diagnostic mode: TCCM DataLogger.

    • Monitor the FRT_WHL_SPD and REAR_WHL_SPD PIDs.

    • Drive the vehicle 30 km/h (18 mph).

    • Record and compare the FRT_WHL_SPD and REAR_WHL_SPD PIDs.

    Do the FRT_WHL_SPD and REAR_WHL_SPD PID values match within 1.5 km/h (1 mph)? 

    Yes  GO to  J10
    No  VERIFY all 4 tires are the same size and brand. INSTALL new tires as necessary. If the tires are OK, CHECK the ABS. and VERIFY that the 4 road tire sizes match. REFER to: Anti-Lock Brake System (ABS) And Stability Control .

  10. J10 CHECK THE TCCM ABSOLUTE THROTTLE POSITION (TP_TCCM) PID

    • Enter the following diagnostic mode: TCCM DataLogger.

    • Monitor the TP_TCCM PID.

    • NOTE: The TP_TCCM PID is as communicated by the PCM via HS-CAN.

      Slowly move throttle from closed throttle to WOT and observe the TP_TCCM PID.

    Does the TP_TCCM PID value vary between 0% at closed throttle and 100% at WOT? 

    Yes  GO to  J11
    No  CHECK the APP sensor and/or the PCM. Refer to Engine Controls - Pinpoint Tests (Except Diesel & Hybrid) .

  11. J11 CHECK 4H MODE OPERATION

    • Switch the MSS to 4H mode.

    Does the 4X4 (4H) indicator illuminate in the IPC message center correctly? 

    Yes  GO to  J14
    No  GO to  J12

  12. J12 CHECK FOR TCCM DTCS

    • Shift the transmission into the PARK position.

    • Enter the following diagnostic mode: TCCM Self-Test.

    Are DTCs retrieved? 

    Yes  REFER to DTC Chart: TCCM 
    No  GO to  J13

  13. J13 CHECK FOR WIND-UP IN 4H MODE

    • Drive the vehicle on a dry, hard surface while executing turns.

    Is wind-up present in turns? 

    Yes  GO to Pinpoint Test F 
    No  GO to Pinpoint Test D 

  14. J14 CHECK FOR STRAIGHTLINE WIND-UP IN 4H MODE

    • Drive the vehicle on a dry, hard surface.

    Is straightline wind-up present? 

    Yes  GO to Pinpoint Test H 
    No  GO to  J15

  15. J15 CHECK WIND-UP IN TURNS IN 4H MODE

    • Drive the vehicle in 4H mode while turning.

    Is wind-up present in turns? 

    Yes  GO to  J16
    No  GO to Pinpoint Test D 

  16. J16 CHECK 4L MODE OPERATION

    • Bring the vehicle to a stop with the transmission in NEUTRAL, switch the MSS to 4L mode.

    Does the 4WD LOW (4L) indicator in the IPC message center illuminate correctly? 

    Yes  GO to  J19
    No  GO to  J17

  17. J17 CHECK FOR TCCM DTCS

    • Select PARK.

    • Enter the following diagnostic mode: TCCM Self-Test.

    Are DTCs retrieved? 

    Yes  REFER to DTC Chart: TCCM .
    No  GO to  J18

  18. J18 CHECK FOR WIND-UP IN 4L MODE

    • Drive the vehicle on a dry, hard surface while executing turns.

    Is wind-up present in turns? 

    Yes  GO to Pinpoint Test K 
    No  GO to Pinpoint Test E 

  19. J19 CHECK FOR WIND-UP IN TURNS IN 4L MODE

    • Drive the vehicle on a dry, hard surface while executing turns.

    Is wind-up present and 4L mode functioning? 

    Yes  GO to  J20
    No  CHECK for DTCs. REFER to the Inspection and Verification procedure. If no DTCs are present, GO to Pinpoint Test E 

  20. J20 CHECK 4L MODE TO 2H MODE SHIFT

    • With the vehicle at a stop and transmission in NEUTRAL, switch the MSS from 4L mode to 2H mode.

    Are there any 4WD mode indicators present in the message center? 

    Yes  GO to  J21
    No  GO to  J23

  21. J21 CHECK FOR TCCM DTCS

    • Select PARK.

    • Release the brake pedal.

    • Enter the following diagnostic mode: TCCM Self-Test.

    Are DTCs retrieved? 

    Yes  REFER to DTC Chart: TCCM 
    No  GO to  J22

  22. J22 CHECK FOR WIND-UP IN 2H MODE

    • Drive the vehicle on a dry, hard surface while executing turns.

    Is wind-up present in turns? 

    Yes  GO to Pinpoint Test E 
    No  To diagnose the 4X4 mode indicators do not operate properly, REFER to: Instrumentation, Message Center and Warning Chimes .

  23. J23 CHECK FOR TRANSFER CASE DISENGAGEMENT

    • Rotate the rear driveshaft while observing the front driveshaft.

    Does the front driveshaft rotate? 

    Yes  REFER to: Transfer Case .
    No  GO to  J24

  24. J24 CHECK FOR LH AND RH DISENGAGEMENT

    • NOTE: The engine must be at idle during the following steps to supply vacuum for IWE disengagement.

      Start the engine and allow to idle.

    • Rotate the LH front tire one revolution forward and one revolution backward while observing the LF halfshaft and U-joint.

    • Rotate the RH front tire one revolution forward and one revolution backward while observing the RF halfshaft and U-joint.

    Does the LH or RH front halfshaft rotate? 

    Yes  GO to Pinpoint Test C 
    No  GO to  J25

  25. J25 CHECK FOR VACUUM LEAKS

    • Ignition OFF.

    • Disconnect both vacuum lines from the IWE solenoid.

    • Using a hand 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.
    No  GO to  J26

  26. J26 CHECK 2H MODE TO 4H MODE SHIFT AT SPEED ABOVE 32 KM/H (20 MPH)

    • Switch the MSS to 2H mode.

    • Drive the vehicle on the road and shift from 2H mode to 4H mode while driving above 32 km/h (20 mph).

    Does the transfer case shift to 4H mode satisfactorily? 

    Yes  The 4WD system is functioning correctly.
    No  GO to Pinpoint Test F 
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