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Pinpoint Test U: 4WD System Functional Test: Notes

Refer to Four Wheel Drive Systems for schematic and connector information.

Normal Operation 

When operating in 4WD modes, both IWEs are locked and the TCCM modulates commanded duty cycle to deliver the necessary torque to the front driveline. When in 4L mode, the transfer case low range gear set provides an additional 2.64 gear reduction. When operating in 2H mode, the transfer case and both IWEs are unlocked.

This pinpoint test is intended to diagnose the following: 

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