Pinpoint Test D : Four-Wheel Drive (4WD) System Functional Test: Notes

Refer to Two Wheel Drive/Four Wheel Drive Systems for schematic and connector information

Normal Operation 

When operating in 4WD modes, the transfer case clutch is energized and both IWEs are locked. 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 clutch is de-energized and both IWEs are unlocked. The transfer case has certain amount of clutch drag which can cause the front driveshaft to spin even when in 2H mode."

Possible Sources 

• Transfer case and related components
• IWEs and related components
• Wheel/tire assemblies