Principles of Operation

WARNING: This page is about a different car, the 2018 Ford EcoSport. However, it is still accessible from the selected car via links, so may be relevant.

The AWD system may be referred to as a 4WD system in other service information and owner literature or messages located on the message center.

The transfer case or power transfer unit is a gearbox that is attached to the transmission. The RH intermediate shaft passes through the transfer case unit and engages the differential side gear as in normal FWD applications. The transfer case unit directs power to the rear driveshaft through a helical gear spline coupled to the transmission differential case, hypoid/helical ring gear assembly and pinion set. The transfer case unit is sealed from the transmission and has its own oil sump.

Serviceable components of the transfer case unit are limited to the transfer case rear seal and flange, transfer case seal (LH), transfer case seal (RH), transfer case input shaft seal. The internal components are not serviced. If any of the geared components, bearings, case cover or internal shafts are worn or damaged, a new transfer case unit must be installed.

Heat Protection transfer case Unit

During off-road operation or heavy trailer towing the AWD system may implement a heat protection mode to protect the transfer case unit from damage. The AWD system will reduce commanded torque to half as the temperature approaches its limit. Once the temperature limit is reached, then 2WD only is commanded.

For concerns with the AWD system or Automatic torque coupling (ATC), Refer to: Four-Wheel Drive Systems .