Pinpoint Test H : Electronic Shift-On-The-Fly (ESOF) System Functional Test: Notes
WARNING: This page is about a different car, the 2016 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
Locator views for the vacuum lines and vacuum reservoir are located in Description and Operation. Refer to: Four-Wheel Drive Systems - System Operation and Component Description . Refer to Two Wheel Drive/Four Wheel Drive Systems for schematic and connector information.
Normal Operation
When operating in 4H or 4L mode, the transfer case 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 and both IWEs are unlocked.
Possible Sources
- 4WD system and/or related components
WARNING:
When directed to drive the vehicle as part of this test, drive the vehicle on a hard surface in an area without traffic to prevent a crash. Failure to follow these instructions may result in personal injury.