Pinpoint Test F: All-Wheel Drive (AWD) System Functional Test
Four Wheel Drive (4WD) Systems - 1-Speed Torque-On-Demand
Pinpoint Tests
Pinpoint Test F: All-Wheel Drive (AWD) System Functional Test
Refer to Wiring Diagram Set 34, Four-Wheel Drive System for schematic and connector information. Diagrams By Number
Normal Operation
When the vehicle is operating in All-Wheel Drive (AWD) LOCKED mode, the front and rear driveshafts rotate at the same speed. The amount of traction the vehicle can achieve depends on the amount of traction each tire can establish with the road surface. In order for the AWD system to operate correctly, each wheel/tire assembly must have matching sizes, and the front and rear axle ratios must match.
This pinpoint test is intended to diagnose the following:
- 4X4 indicator
- 4X4 control module
- Transfer case and related components
- Wheel/tire assemblies
PINPOINT TEST F: ALL-WHEEL DRIVE (AWD) SYSTEM FUNCTIONAL TEST
NOTE: AWD LOCKED mode is not intended for driving on hard/dry surfaces.
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F1 CHECK THE AWD LOCKED INDICATOR PROVE-OUT
- Ignition ON.
- Does the 4X4 indicator illuminate at prove out?
Yes
GO to F2.
No
CHECK the Instrument Cluster (IC). REFER to Instrument Panel, Gauges and Warning Indicators. TEST the system for normal operation.
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F2 CHECK THE AWD AUTO OPERATION
- Select AWD AUTO.
- Is the 4X4 indicator off?
Yes
GO to F5.
No
GO to F3.
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F3 CHECK FOR DTCs
- Connect the scan tool.
- Carry out the 4X4 control module self-test.
- Are DTCs present?
Yes
REFER to the 4X4 Control Module DTC Chart for diagnosis. Four Wheel Drive (4WD) Systems - 1-Speed Torque-On-Demand
No
GO to F4.
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F4 CHECK FOR WIND-UP IN AWD AUTO
- Drive the vehicle on a dry, hard surface in turns.
- Is wind-up present in turns?
Yes
Go To Pinpoint Test C. Pinpoint Test C: The Vehicle Does Not Shift Between All-Wheel Drive (AWD) AUTO And AWD LOCKED Correctly
No
Go To Pinpoint Test D. Pinpoint Test D: The 4X4 Indicator Does Not Operate Correctly/Does Not Operate
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F5 CHECK THE 4WD CLUTCH PWM STATUS (4WDCPWMST) PID
- Connect the scan tool.
- Enter the following diagnostic mode on the scan tool: DataLogger - 4X4 Control Module.
- Monitor the 4WDCPWMST PID.
- Does the 4WDCPWMST PID indicate approximately 2-4% clutch application at closed throttle?
Yes
GO to F6.
No
Go To Pinpoint Test C. Pinpoint Test C: The Vehicle Does Not Shift Between All-Wheel Drive (AWD) AUTO And AWD LOCKED Correctly
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F6 CHECK THE ABS MODULE WHEEL SPEED SENSOR PIDs
- Enter the following diagnostic mode on the scan tool: DataLogger - ABS Module.
- While driving the vehicle at 30 km/h (18 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)
- Compare the speedometer reading to the wheel speed sensor PIDs.
- Do the wheel speed sensor PIDs and speedometer speeds match within 1.5 km/h (1 mph)?
Yes
GO to F7.
No
VERIFY that the 4 road wheels are the same size and have similar tread depth. CHECK the ABS for faults. TEST the system for normal operation.
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F7 CHECK THE TP STATUS (TPI) PID
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger - 4X4 Control Module.
- NOTE: The TPI PID is Accelerator Pedal Position (APP) as communicated by the PCM via High Speed Controller Area Network (HS-CAN).
- Slowly move throttle from closed throttle to Wide Open Throttle (WOT) and observe the TPI PID, Key ON Engine OFF (KOEO).
- Does the TPI PID value vary between 0 at closed throttle and 255 at WOT?
Yes
GO to F8.
No
CHECK the APP sensor and/or PCM. REFER to Computers and Control Systems Information. TEST the system for normal operation.
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F8 CHECK FOR WIND-UP IN TURNS ON THE THROTTLE
- Drive the vehicle on a dry, hard surface, executing turns while applying the throttle.
- Is wind-up present?
Yes
CHECK the transfer case. TEST the system for normal operation.
No
GO to F9.
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F9 CHECK THE AWD LOCKED OPERATION
- Select AWD LOCKED.
- Does the 4X4 indicator illuminate correctly?
Yes
GO to F10.
No
GO to F11.
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F10 CHECK FOR AWD LOCKED WIND-UP
- Drive the vehicle on a dry, hard surface in turns.
- Is wind-up present in turns?
Yes
GO to F13.
No
Go To Pinpoint Test C. Pinpoint Test C: The Vehicle Does Not Shift Between All-Wheel Drive (AWD) AUTO And AWD LOCKED Correctly
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F11 CHECK FOR DTCs
- Carry out the 4X4 control module self-test.
- Are DTCs present?
Yes
REFER to the 4X4 Control Module DTC Chart for diagnosis. Four Wheel Drive (4WD) Systems - 1-Speed Torque-On-Demand
No
GO to F12.
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F12 CHECK FOR WIND-UP IN AWD LOCKED WHILE APPLYING THE THROTTLE
- Drive the vehicle on a dry, hard surface in turns while applying the throttle.
- Is wind-up present in turns?
Yes
Go To Pinpoint Test D. Pinpoint Test D: The 4X4 Indicator Does Not Operate Correctly/Does Not Operate
No
Go To Pinpoint Test C. Pinpoint Test C: The Vehicle Does Not Shift Between All-Wheel Drive (AWD) AUTO And AWD LOCKED Correctly
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F13 CHECK THE AWD AUTO OPERATION
- Select AWD AUTO.
- Does the 4X4 indicator turn off?
Yes
The AWD system is operating correctly.
No
GO to F14.
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F14 CHECK FOR DTCs
- Carry out the 4X4 control module self-test.
- Are DTCs retrieved?
Yes
REFER to the 4X4 Control Module DTC Chart. Four Wheel Drive (4WD) Systems - 1-Speed Torque-On-Demand
No
GO to F15.
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F15 CHECK FOR WIND-UP IN AWD AUTO
- Drive the vehicle on a dry, hard surface in turns.
- Is wind-up present in turns?
Yes
Go To Pinpoint Test D. Pinpoint Test D: The 4X4 Indicator Does Not Operate Correctly/Does Not Operate
No
Go To Pinpoint Test C. Pinpoint Test C: The Vehicle Does Not Shift Between All-Wheel Drive (AWD) AUTO And AWD LOCKED Correctly
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