Pinpoint Test A: All-Wheel Drive (AWD) System Functional Test
Four Wheel Drive (4WD) Systems
Pinpoint Tests
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. Diagrams By Number
Normal Operation
The All-Wheel Drive (AWD) system continuously monitors vehicle conditions and automatically adjusts the torque distribution between the front and rear wheels. During normal operation, most of the torque is delivered to the front wheels. If wheel slip between the front and rear wheels is detected, or if the vehicle is under heavy acceleration, the AWD system increases torque to the rear wheels to prevent or control wheel slip.
This pinpoint test is intended to diagnose the following:
- AWD 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. Inspection and Verification
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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 Active Torque Coupling (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. Pinpoint Test E: Vehicle Binds In A Turn Or Resists Turning/Pulsates Or Shudders In A Straight Line
No
GO to A2.
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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?
Yes
GO to A3.
No
REFER to Computers and Control Systems Information to diagnose the accelerator pedal position sensor concern.
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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?
Yes
GO to A4.
No
GO to Pinpoint Test F. Pinpoint Test F: DTC P1635
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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.
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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 E. Pinpoint Test E: Vehicle Binds In A Turn Or Resists Turning/Pulsates Or Shudders In A Straight Line
No
GO to A6.
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A6 CHECK FOR TORQUE AT REAR WHEELS USING PWM 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. Pinpoint Test D: DTCs P1824 and P1825
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