Pinpoint Test

CHECK FOR ATC SOLENOID LOCK
1. Drive the vehicle on a dry, hard surface in turns while applying the accelerator pedal.
Is driveline wind-up/binding present in turns?
1. Yes: With the ignition ON (RUN), allow the ATC solenoid to cool down for at least 10 minutes and REPEAT the test. CHECK for wind-up/binding again. If no wind-up/binding is found, GO to 2 .
  If still present, REFER to Diagnostic Routine E: Vehicle Binds in a Turn or Resists Turning, Pulsates or Shudders in a Straight Line
2. No : GO to 2 .
CHECK THE ACCELERATOR PEDAL POSITION (APP) PID
1. Ignition ON.
2. Using a scan tool, view PCM PID.
3. While monitoring the PCM PID APP, press the accelerator pedal.
Does APP PID percent value match the approximate accelerator pedal position?
1. Yes: GO to 3 .
2. No : REFER to the DTC INDEX to diagnose the accelerator pedal position sensor concern.
CHECK ABS MODULE WHEEL SPEED SENSOR PIDs
1. Using a scan tool, view ABS PIDs .
2. While driving the vehicle at 48 km/h (30 mph), monitor the ABS module 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 .
Check Vehicle Acceleration in a straight line
1. Carry out 3 accelerations from 0-48 km/h (0-30 mph) in a straight line (1 each with low, medium and full accelerator pedal application).
Does the vehicle pulsate or shudder while accelerating?
1. Yes: REFER to Diagnostic Routine E: Vehicle Binds in a Turn or Resists Turning, Pulsates or Shudders in a Straight Line
2. No : GO to 5 .
CHECK VEHICLE TURNING ABILITY
1. Drive the vehicle in a fully locked turn, on dry pavement, at 8 km/h (5 mph).
Does the vehicle bind in the turn or resist turning?
1. Yes: REFER to Diagnostic Routine B: P187B
2. No : GO to 6 .
CHECK FOR TORQUE AT REAR WHEELS USING AWD CLUTCH CONTROL COMMANDED (AWD_CLTCH_CMD) PID
1. Ignition ON.
2. Using a scan tool, view PCM PID.
3. Using the scan tool, command AWD_CLTCH_CMD to energize the ATC solenoid to a constant 95% applied.
4. Drive the vehicle in a fully locked turn, on dry pavement, at 8 km/h (5 mph).
Does the vehicle bind in the turn or resist turning?
1. Yes: END the active command. The concern cannot be duplicated at this time. RETURN the vehicle to the customer.
2. No : END the active command. CHECK the PTU. REFER to SYMPTOM CHART: POWER TRANSFER UNIT (PTU) .