Pinpoint Test A : AWD (All-Wheel Drive) 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 Diagnostic Trouble Codes (DTCs). If Diagnostic Trouble Codes (DTCs) are set in other modules, diagnose those Diagnostic Trouble Codes (DTCs) first before continuing.
- A1 CHECK ABS WHEEL SPEEDS
- Using a scan tool, drive the vehicle at 30 mph (48 km/h) and monitor the following wheel speed sensor PIDs:
- Left Front Wheel Speed Sensor (WHL_SPD_LF)
- Left Rear Wheel Speed Sensor (WHL_SPD_LR)
- Right Front Wheel Speed Sensor(WHL_SPD_RF)
- Right Rear Wheel Speed Sensor (WHL_SPD_RR)
Are all 4 wheel speeds within 1.2 mph (2 km/h) of each other?
Yes GO to A2 No REFER to: Anti-Lock Brake System (ABS) And Stability Control - Using a scan tool, drive the vehicle at 30 mph (48 km/h) and monitor the following wheel speed sensor PIDs:
- A2 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).
Is clutch slip or chattering observed from the rear drivetrain?
Yes GO to Pinpoint Test B No GO to A3 - A3 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 B No GO to A4 - A4 CHECK TORQUE AT THE REAR LH (LEFT-HAND) WHEELS
- Using the diagnostic scan tool, enable the clutch hydraulic pump motor. Command AWD_CLT_Ebl# ON. Using AWD_CLT_L_SPT, then command the LH clutch solenoid set point to 1000 NM.
- On dry pavement, drive the vehicle in a fully locked left turn at 5 mph (8 km/h).
Does the vehicle bind in the turn or resist turning?
Yes GO to A5 No INSTALL a new rear drive unit. Refer to: Axle Assembly - A5 CHECK TORQUE AT THE REAR RH (RIGHT-HAND) WHEELS
- Using the diagnostic scan tool, enable the clutch hydraulic pump motor, command AWD_CLT_Ebl# ON. Using AWD_CLT_R_SPT, command the RH clutch solenoid set point to 1000 NM.
- On dry pavement, drive the vehicle in a fully locked RH turn at 5 mph (8 km/h).
Does the vehicle bind in the turn or resist turning?
Yes System is operating correctly at this time. No INSTALL a new rear drive unit. Refer to: Axle Assembly