Pinpoint Test A: All-Wheel Drive (AWD) System Functional Test

Four Wheel Drive (4WD) Systems

Pinpoint Test A: All-Wheel Drive (AWD) System Functional Test

Refer to Wiring Diagram Set 34, All Wheel Drive (AWD) for schematic and connector information Electrical Diagrams.

Normal Operation

The AWD (All-Wheel Drive) system is intended to optimally distribute torque between the rear and front wheels through the use of an electromagnetic clutch located in the rear differential.

This pinpoint test is intended to diagnose the following:

- AWD (All-Wheel Drive) system concern without on-demand or continuous DTCs

PINPOINT TEST A : All-Wheel Drive (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. Four Wheel Drive (4WD) Systems

A1 CHECK FOR ATC (Active Torque Coupling) 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
With the ignition ON (RUN), allow the Active Torque Coupling (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 A2.


If still present, GO to Pinpoint Test E Pinpoint Test E: Vehicle Binds in a Turn Or Resists Turning/Pulsates Or Shudders in a Straight Line.

No
GO to A2.

A2 CHECK THE ACCELERATOR PEDAL POSITION (APP) PID

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: DataLogger- PCM.

- Monitor the APP PID while pressing the accelerator pedal.

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

Yes
GO to A3.

No
REFER to Computers and Control Systems Information to diagnose the accelerator pedal position sensor concern.

A3 CHECK ABS MODULE WHEEL SPEED SENSOR PIDs

- Enter the following diagnostic mode on the scan tool: DataLogger- ABS 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?

Yes
GO to A4.

No
GO to Pinpoint Test E Pinpoint Test E: Vehicle Binds in a Turn Or Resists Turning/Pulsates Or Shudders in a Straight Line.

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?

Yes
GO to Pinpoint Test E Pinpoint Test E: Vehicle Binds in a Turn Or Resists Turning/Pulsates Or Shudders in a Straight Line.

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 B Pinpoint Test B: DTC P187B.

No
GO to A6.

A6 CHECK FOR TORQUE AT REAR WHEELS USING AWD (All-Wheel Drive) CLUTCH CONTROL COMMANDED (AWD_CLTCH_CMD) PID

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: DataLogger- PCM.

- Using the scan tool, command AWD_CLTCH_CMD to energize the ATC (Active Torque Coupling) solenoid to a constant 95% 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 the Power Transfer Unit (PTU).