Pinpoint Test F : MSOS Functional Test: Notes
WARNING: This page is about a different car, the 2018 Ford F-550 Super Duty, 2018 Ford F-450 Super Duty, 2018 Ford F-350 Super Duty, and 2018 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
Refer to Four Wheel Drive Systems for schematic and connector information.
Normal Operation
When operating in Four-Wheel Drive (4WD) high (4H) mode, the transfer case locks the front driveline to the rear. When set to the LOCK position, the manual hublocks connect the front axle shafts to the wheel hubs. When in 4WD low (4L) mode, the transfer case low range gear set provides an additional 2.64:1 gear reduction. When operating in 2-Wheel Drive (2WD) high (2H) mode, the transfer case decouples the front driveline from the rear driveline. For improved fuel economy, both manual hublocks should be set to FREE in 2H mode.
Possible Sources
- Transfer case and related components
- Wheel and tire assemblies
- Front axle assembly
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.