AWD (All-Wheel Drive) System Functional Test

A1 CHECK FOR ACTIVE TORQUE COUPLING SOLENOID LOCK
- Drive the vehicle on a dry, hard surface in turns while applying the accelerator pedal.
Is driveline wind-up present in turns?
- Yes : GO to PINPOINT TEST E
- No : GO to A2
A2 CHECK PCM (POWERTRAIN CONTROL MODULE) WHEEL SPEEDS
- Ignition ON.
- Drive the vehicle at 30 mph (48 km/h), 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 1.2 mph (2 km/h) of each other?
- Yes : GO to A3
- No : REFER to: ANTI-LOCK BRAKE SYSTEM (ABS) AND STABILITY CONTROL .
A3 CHECK VEHICLE ACCELERATION IN A STRAIGHT LINE
- Perform 3 accelerations from mph (km/h) to 30 mph (48 km/h) in a straight line (1 each with low, medium and full accelerator pedal application).
Does the vehicle pulsate or shudder while accelerating?
- Yes : GO to PINPOINT TEST E
- No : GO to A4
A4 CHECK VEHICLE TURNING ABILITY
- Drive the vehicle in a fully locked turn, on dry pavement, at 5 mph (8 km/h).
Does the vehicle bind in the turn or resist turning?
- Yes : GO to PINPOINT TEST E
- No : GO to A5
A5 CHECK TORQUE AT THE REAR WHEELS
- Using the diagnostic scan tool, energize the active torque coupling solenoid to a constant 90% applied.
- On dry pavement, drive the vehicle in a fully locked turn at 5 mph (8 km/h).
Does the vehicle bind in the turn or resist turning?
- Yes : END the active command. CLEAR all Diagnostic Trouble Codes (DTCs) if set. End of System Functional Test.
- No : CHECK the power transfer unit, REFER to: TRANSFER CASE .