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Home >> Ford >> 2008 >> Expedition EL RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Four Wheel Drive (4WD) Systems) >> Diagnostic Tests >> Four Wheel Drive (4WD) Systems - 1-Speed Torque-On-Demand >> Pinpoint Tests >> Pinpoint Test K: The Vehicle Binds in Turns/Resists Turning/Pulsates/Shudders in a Straight Line >> Pinpoint Test K: The Vehicle Binds In Turns/Resists Turning/Pulsates/Shudders In A Straight Line

Pinpoint Test K: The Vehicle Binds In Turns/Resists Turning/Pulsates/Shudders In A Straight Line

WARNING: This page is about a different variant/trim than selected.
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. K1 VERIFY THE CONCERN 
    • Test drive the vehicle on a straight stretch of road in 4X4 AUTO mode.
    • Drive the vehicle through turns and parking lot maneuvers.
    • Does the vehicle bind, pulsate or shudder? 
    1. YES  : If the problem occurs in 4X4 AUTO mode, go to  K2; in 4X4 mode, binding is a normal condition.
    2. NO  : Go to Pinpoint Test G .
  2. K2 CHECK THE 4X4 MODE INDICATOR 
    • Review the test drive notes.
    • Did the 4X4 mode indicator or the powertrain malfunction indicator illuminate? 
    1. YES  : If the powertrain malfunction indicator is illuminated, go to  K4. If the 4X4 mode indicator stays illuminated, go to  K3.
    2. NO  : Go to  K5.
  3. K3 VERIFY THE FAULT 
    • Review the test drive notes.
    • Was 4X4 mode selected when the indicators were illuminated in the Instrument Cluster (IC) message center? 
    1. YES  : The system is functioning correctly.
    2. NO  : The fault may have been caused by an intermittent, uncommanded or auto lock shift. TEST the system for normal operation. Go to Pinpoint Test G .
  4. K4 CHECK FOR DTCs 
    • Connect the diagnostic tool.
    • Carry out the on-demand self test.
    • Are DTCs retrieved? 
    1. YES  : REFER to the 4X4 Control Module DTC Chart for diagnosis.
    2. NO  : Go to  K5.
  5. K5 VERIFY THE CONCERN 
    • Disconnect: Transfer Case C350
    • 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? 
    1. YES  : INSPECT the driveline components for damage or wear. REFER to Inspection and Verification . TEST the system for normal operation.
    2. NO  : Go to  K6.
  6. K6 CHECK THE 4WD CLUTCH PWM STATUS (4WDCPWMST) PID 
    • Key in OFF position.
    • Connect: Transfer Case C350
    • Key in ON position.
    • Clear the DTCs.
    • Select 4X4 mode.
    • Enter the following diagnostic mode on the diagnostic tool: DataLogger - 4X4 Control Module
    • Monitor the 4WDCPWMST PID at closed throttle, Key ON Engine OFF (KOEO).
    • Is the 4WDCPWMST PID at least 12%? 
    1. YES  : Go to  K7.
    2. NO  : CHECK the transfer case. REFER to TRANSFER CASE article. TEST the system for normal operation.
  7. K7 CHECK THE ABS MODULE WHEEL SPEED SENSOR PIDs 
    • Enter the following diagnostic mode on the diagnostic tool: DataLogger - 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)? 
    1. YES  : Go to  K8.
    2. NO  : VERIFY that the 4 road wheels are the same size and have similar tread depth. CHECK the ABS for faults. REFER to VEHICLE DYNAMIC SYSTEMS article. TEST the system for normal operation.
  8. K8 CHECK THE THROTTLE POSITION STATUS (TPI) PID 
    • Enter the following diagnostic mode on the diagnostic tool: DataLogger - 4X4 Control Module
      • NOTE: The TPI PID is Accelerator Pedal Position (APP) as communicated by the PCM via High Speed Controller Area Network (HS-CAN).
    • Slowly move throttle from closed throttle to Wide Open Throttle (WOT) and observe the TPI PID.
    • Does the TPI PID value vary between 0 at closed throttle and 255 at WOT? 
    1. YES  : Go to  K9.
    2. NO  : CHECK the throttle position sensor and/or PCM for faults. REFER to the Introduction - Gasoline Engines article. TEST the system for normal operation.
  9. K9 CHECK THE TRANSFER CASE FRONT DRIVESHAFT OUTPUT 
    • With the vehicle in NEUTRAL, position it on a hoist. Refer to JACKING AND LIFTING article.
    • Rotate the front driveshaft by hand.
    • Does the front driveshaft rotate freely (does it require less than 45 N.m [33 lb-ft] to rotate)? 
    1. YES  : INSTALL a new 4X4 control module. REFER to 4X4 Control Module . TEST the system for normal operation.
    2. NO  : CHECK the transfer case. REFER to TRANSFER CASE article. TEST the system for normal operation.
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