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Home >> Ford >> 2012 >> Mustang Base, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 557 (Four Wheel Drive (4WD) Systems) >> Diagnosis And Testing >> Four Wheel Drive (4WD) Systems - 2-Speed Torque-On-Demand >> Pinpoint Tests >> Pinpoint Test W: Vehicle Binds in a Turn/Resists Turning/Pulsates in a Straightline in 4WD Mode >> Pinpoint Test W: Vehicle Binds In A Turn/Resists Turning/Pulsates In A STRAIGHTLINE In 4WD Mode

Pinpoint Test W: Vehicle Binds In A Turn/Resists Turning/Pulsates In A STRAIGHTLINE In 4WD Mode

WARNING: This page is about a different car, the 2014 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: 4X4 is not intended for driving on hard/dry surfaces; using 4X4 mode while driving on these surfaces may produce noises like intermittent clunking, but will not damage driveline components.
  1. W1 VERIFY THE CONCERN 
    • Test drive the vehicle on a straight stretch of road in 4A mode.
    • Drive the vehicle through turns and parking lot maneuvers.

    Does the vehicle bind, pulsate or shudder? 

    • Yes  : If the problem occurs in 4A mode, GO to W2  ; If 4H mode or 4L mode, binding is a normal condition.
    • No  : GO to PINPOINT TEST S .
  2. W2 CHECK THE 4H AND 4L INDICATORS 
    • Review the test drive notes.

    Did the 4X4 (4H) or 4X4 LOW (4L) or powertrain malfunction indicator (wrench light) illuminate in the IPC message center? 

    • Yes  : If the powertrain malfunction indicator (wrench light) illuminated, GO to  W4.

      If the 4H mode or 4L mode indicators illuminated, GO to W3  .

    • No  : GO to  W5.
  3. W3 VERIFY THE FAULT 
    • Review the test drive notes.

    Was 4H mode or 4L mode selected when the 4H or 4L indicators were illuminated in the IPC message center? 

    • Yes  : The system is functioning correctly.
    • No  : The fault may have been caused by an intermittent, uncommanded or autolock shift. TEST the system for normal operation. GO to PINPOINT TEST S .
  4. W4 CHECK FOR TCCM DTCs 
    • Enter the following diagnostic mode on the scan tool: Self-Test - TCCM  .

    Are DTCs retrieved? 

    • Yes  : REFER to the TCCM DTC CHART  for diagnosis.
    • No  : GO to W5  .
  5. W5 VERIFY THE CONCERN WITH TRANSFER CASE CONNECTOR DISCONNECTED 
    • Disconnect: Transfer Case.
    • Test drive the vehicle on a straight stretch of road and in turns, and shift the transfer case through each mode. Record any fault conditions.

    Is the concern present? 

    • Yes  : INSPECT the driveline components for damage or wear. REFER to INSPECTION AND VERIFICATION . TEST the system for normal operation.
    • No  : GO to W6  .
  6. W6 CHECK THE TCCM 4WD PWM CLUTCH STATUS (4WD_CLTCH_OUT) PID 
    • Connect: Transfer Case.
    • Using the scan tool, clear the DTCs.
    • Enter the following diagnostic mode on the scan tool: Data Logger - TCCM  .
    • Monitor the 4WD_CLTCH_OUT PID at closed throttle, KOEO  .
    • Select 4H mode.

    Does the PID indicate 2 to 10% clutch application at closed throttle? 

    • Yes  : GO to W7  .
    • No  : CHECK the transfer case. REFER to TRANSFER CASE . TEST the system for normal operation.
  7. W7 CHECK THE ABS MODULE WHEEL SPEED SENSOR PIDs 
    • Enter the following diagnostic mode on the scan tool: Data Logger - ABS Module.
    • While driving the vehicle at 30 km/h (18 mph), monitor the following wheel speed sensor PIDs:
      • Left Front Wheel Speed Sensor (LF_WSPD)
      • Left Rear Wheel Speed Sensor (LR_WSPD)
      • Right Front Wheel Speed Sensor (RF_WSPD)
      • Right Rear Wheel Speed Sensor (RR_WSPD)
    • Compare the speedometer reading to the wheel speed sensor PIDs.

    Do the wheel speed sensor PIDs and speedometer speeds match within 1.5 km/h (1 mph)? 

  8. W8 CHECK THE TCCM ABSOLUTE THROTTLE POSITION (TP_TCCM) PID 
    • Enter the following diagnostic mode on the scan tool: Data Logger - TCCM  .
    • NOTE: The TP_TCCM PID is APP  as communicated by the PCM via HS-CAN  .

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

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

  9. W9 CHECK THE TRANSFER CASE FRONT DRIVESHAFT OUTPUT 
    • With the vehicle in NEUTRAL, position it on a hoist. Refer to JACKING & LIFTING .
    • Rotate the front driveshaft by hand.

    Does the front driveshaft rotate freely (does it require less than 45 Nm [33 lb-ft] to rotate)? 

    • Yes  : GO to W10  .
    • No  : CHECK the transfer case. REFER to TRANSFER CASE . TEST the system for normal operation.
  10. W10 CHECK FOR CORRECT TCCM OPERATION 
    • Ignition OFF.
    • Disconnect and inspect all TCCM  connectors.
    • Repair:
      • corrosion (install new connector or terminals - clean module pins)
      • damaged or bent pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary
    • Connect all TCCM  connectors. Make sure they are seated correctly.
    • Operate the system and verify the concern is still present.

    Is the concern still present? 

    • Yes  : INSTALL a new TCCM  . REFER to TRANSFER CASE CONTROL MODULE (TCCM) . TEST the system for normal operation.
    • No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. ADDRESS the root cause of the connector or pin issues.
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