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Home >> Ford >> 2002 >> Cutaway 7.3 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 2940 (Four Wheel Drive (4WD) Systems -- F250-F550 Super Duty) >> Diagnosis And Testing >> Four Wheel Drive (4WD) Systems - Electronic Shift >> Pinpoint Tests >> Pinpoint Test O: Electronic Shift-On-The-Fly (ESOF) Functional Test >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2011 Ford Pickup, 2011 Ford F550 Super Duty, 2011 Ford F450 Super Duty, and 2011 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

When operating in 4H (4X4 HIGH) or 4L (4X4 LOW) mode, the transfer case and the Constant Vacuum Hublock (CVH) at each front wheel are locked. When in 4L mode, the transfer case low range gear set provides an additional 2.72 gear reduction. When operating in 2H (4X2) mode, the transfer case and both CVH  are unlocked.

This pinpoint test is intended to diagnose the following:

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