Differential Electronic Module (DEM) (TF-80SC AWD; 2005-2008): Function: PRETENSIONING

The function of the four-wheel drive system is based in there being a difference in speed between front and rear wheels. This difference in speed can affect traction performance in certain driving situations. The role of the pretensioning function is to improve traction performance, primarily in starting off from being stationary, without affecting other properties of the system to achieve this.

The pretensioning function is obtained by means of the feed pump building up a basic pressure. A pretensioning of the clutch unit is generated by means of this increase in pressure, and the engine torque can be transferred to both rear and front wheels. The pretensioning functionality is controlled by software so that activation only takes place when necessary.