Description And Operation: Overview

Vehicles without the active driveline system have conventional mechanical differentials for the for the front and rear torque output to the halfshafts. The front differential is located within the manual or automatic transmission. The rear differential is located in its own housing and is attached to the rear subframe.

The non-active driveline system comprises a front differential, a Power Transfer Unit (PTU), a two-piece driveshaft, an active on-demand coupling and a rear differential.

The full-time intelligent system continuously varies the front/rear torque split using an electronically-controlled active on-demand coupling to provide variable torque AWD (all-wheel drive) when required.

The PTU is located at the rear of the engine and is attached directly to the right side of the transmission casing. A bracket on the PTU attaches the unit to the engine cylinder block.

The PTU is common to both the Petrol and Diesel engine equipped vehicles.

The PTU transfers the output from the transmission and distributes it to the rear wheels via a two-piece driveshaft to the active on-demand coupling and the rear differential. The active on-demand coupling controls the torque output to the rear differential. The front halfshafts are driven from the transmission front differential, not the PTU.

For details of the active on-demand coupling and the rear differential: For additional information, refer to: REAR DRIVE AXLE AND DIFFERENTIAL