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Home >> Ford >> 2003 >> Cutaway 7.3 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 2501 (Transfer Case - 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 2010 Ford Pickup, 2010 Ford F550 Super Duty, 2010 Ford F450 Super Duty, and 2010 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

When operating in 4X4 High, the transfer case and both Pulse Vacuum Hublock (PVH) are locked. When in 4X4 Low, the transfer case low range gear set provides an additional 2.72 gear reduction. When operating in 2-Wheel Drive (2WD), the transfer case and both PVH  s are unlocked.

This pinpoint test is intended to diagnose the following: 

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