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Home >> Ford >> 2012 >> Explorer Base, 3.5 8, AWD, 6F50 >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> Four Wheel Drive (4WD) Systems >> Diagnostic Routine(S) >> Diagnostic Routine E >> Pinpoint Test
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Pinpoint Test

  1. CHECK FOR TORQUE AT THE REAR WHEELS
    1. Ignition OFF.
    2. Disconnect: ATC Solenoid.
    3. Drive the vehicle in a straight line on dry pavement.

    Is a pulsation or shudder still present?

    1. Yes:  REFER to SYMPTOM CHART: NVH
    2. No  : GO to 2  .
  2. MONITOR THE AWD CLUTCH CONTROL COMMANDED (AWD_CLTCH_CMD) PID
    1. Ignition OFF.
    2. Connect: ATC Solenoid.
    3. Ignition ON.
    4. Using a scan tool, view PCM PIDs  .
    5. Monitor the AWD _CLTCH_CMD PID.
    6. Drive the vehicle no faster than 8 km/h (5 mph) in tight turns on dry pavement while monitoring the ATC solenoid duty cycle.

    Is the duty cycle greater than 20%?

    1. Yes:  GO to 3  .
    2. No  : REFER to Diagnostic Routine B: P187B .
  3. CHECK FOR THE CORRECT WHEEL SPEEDS USING THE WHEEL SPEED SENSORS PIDs 
    1. Using a scan tool, view ABS PIDs  .
    2. While driving the vehicle at 48 km/h (30 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)

    Are all 4 wheel speeds within 2 km/h (1.2 mph) of each other?

    1. Yes:  GO to 4  .
    2. No  : REFER to Diagnostic Routine B: P187B .
  4. MONITOR THE ACCELERATOR PEDAL POSITION (APP) PID
    1. Using a scan tool, view PCM PIDs  .
    2. Monitor APP PID while applying and releasing the accelerator pedal.

    Does APP PID percent value match the approximate accelerator pedal position?

    1. Yes:  GO to 5  .
    2. No  : REFER to the INTRODUCTION - GASOLINE MODELS to diagnose the engine control system.
  5. CHECK FOR CORRECT AWD RELAY MODULE OPERATION
    1. Ignition OFF.
    2. Disconnect and inspect the AWD relay module connector/harness and the ATC solenoid connector/harness component side.
    3. 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
  6. Reconnect the AWD relay module connector and the ATC solenoid connector. Make sure they seat and latch correctly.
  7. Operate the system and determine if the concern is still present.

Is the concern still present?

  1. Yes:  CHECK OASIS  for any applicable TSBs  . If a TSB exists for this concern, discontinue this test and follow TSB instructions. If no TSBs  address this concern, INSTALL a new AWD relay module. REFER to All-Wheel Drive (AWD) Relay Module 
  2. No  : The system is operating correctly at this time. The concern may have been caused by module connections. Address the root cause of any connector or pin issues.
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