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: Check related modules for DTCs. If DTCs are set in other modules, diagnose those DTCs first before continuing.
- A1 CHECK FOR ATC SOLENOID LOCK
- Drive the vehicle on a dry, hard surface in turns while applying the accelerator pedal.
Is driveline wind-up/binding present in turns?
Yes Keep the engine OFF for at least 10 minutes then repeat the test. CHECK again for wind-up/binding. If no wind-up/binding is found, GO to A3. If still present, GO to Pinpoint Test F . No GO to A2. - A2 CHECK THE ACCELERATOR PEDAL FUNCTION
- Ignition ON.
- Using a scan tool, view PCM PID.
- While monitoring the PCM PID APP, press the accelerator pedal.
Does the accelerator pedal position match the APP PID percent value?
Yes GO to A3. No REFER to the ENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS (EXCEPT DIESEL & HYBRID) to diagnose the accelerator pedal position sensor concern. - A3 CHECK ABS MODULE WHEEL SPEED SENSORS
- Using a scan tool, view ABS PIDs.
- 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?
Yes GO to A4. No REFER to Anti-Lock Brake System (ABS) and Stability Control . - A4 CHECK VEHICLE ACCELERATION IN A STRAIGHT LINE
- Perform 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?
Yes GO to Pinpoint Test F . No GO to A5. - 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?
Yes GO to Pinpoint Test F . No GO to A6. - A6 CHECK TORQUE AT THE REAR WHEELS
- Using the diagnostic scan tool, energize the ATC solenoid to a constant 90% applied.
- On dry pavement, drive the vehicle in a fully locked turn at 8 km/h (5 mph).
Does the vehicle bind in the turn or resist turning?
Yes END the active command. CLEAR all DTCs if set. End of System Functional Test. No CHECK the PTU, REFER to Transfer Case - Power Transfer Unit (PTU) .