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Pinpoint Test A: AWD System Functional Test

WARNING: When directed to drive the vehicle as part of this test, drive the vehicle on a hard surface in an area without traffic to prevent a crash. Failure to follow these instructions may result in personal injury.
NOTE: Carry out a thorough inspection and verification as outlined before carrying out this pinpoint test. Refer to INSPECTION AND VERIFICATION  .
  1. A1 CHECK FOR ATC SOLENOID (PART OF REAR AXLE) LOCK 
    • Drive the vehicle on a dry, hard surface in turns while applying the accelerator pedal.
    • Is driveline wind-up present in turns? 
    • Yes  : With the ignition ON, allow the ATC solenoid to cool down for at least 10 minutes and repeat the test. CHECK for wind-up again. If no wind-up is found, GO to  A3. If still present, GO to PINPOINT TEST E .
    • No  : GO to A2.
  2. A2 CHECK FOR VALID ACCELERATOR PEDAL POSITION MONITORING THE ACCELERATOR PEDAL POSITION (AP) PID 
    • Enter the following diagnostic mode on the scan tool: DataLogger - 4X4 Control Module.
    • Monitor the AP PID while pressing the accelerator pedal.
    • Does the accelerator pedal position match the AP PID percent value? 
  3. A3 CHECK 4X4 CONTROL MODULE WHEEL SPEED SENSOR PIDs 
    • Enter the following diagnostic mode on the scan tool: DataLogger - 4X4 Control Module.
    • 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? 
  4. A4 CHECK VEHICLE ACCELERATION IN A STRAIGHT LINE 
    • 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? 
  5. A5 CHECK VEHICLE TURNING ABILITY 
    • 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? 
  6. A6 CHECK FOR TORQUE AT REAR WHEELS USING OUTPUT CONTROL COMMAND #1 (CLCH_SOL) ACTIVE COMMAND 
    • Enter the following diagnostic mode on the scan tool: DataLogger - 4X4 Control Module.
    • Using the scan tool, command CLCH_SOL to energize the ATC solenoid to a constant 100% applied.
    • 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? 
    • Yes  : END the active command. The concern cannot be duplicated at this time. RETURN the vehicle to the customer.
    • No  : END the active command. CHECK that the driveshaft rotates when the transaxle is in gear. If yes, GO to PINPOINT TEST D . If no, CHECK the Power Transfer Unit (PTU). REFER to TRANSFER CASE - POWER TRANSFER UNIT (PTU) Article.
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