•  When starting off or accelerating during straight-ahead driving, torque transmitted to the rear wheels is optimally controlled to ensure sufficient acceleration performance. Due to this, standing-start and acceleration performance is improved.

•  If a parking brake signal input to the 4WD CM indicates, the module controls the torque transmitted to the rear wheels.

•  When the 4WD CM determines, based on the four-wheel speed signal, that the vehicle is in tight cornering, it reduces the torque transmitted to the rear wheels to avoid tight corner braking characteristics.

•  If a signal from the DSC/RSC HU/CM input to the 4WD CM indicates that ABS control is activated, the module controls the torque transmitted to the rear wheels to prevent undue influence on ABS control.

•  Also, when a coupling torque request signal is received from the DSC/RSC HU/CM, the module controls the torque transmitted to the rear wheels to match the amount of requested torque.

•  In case the rear differential oil temperature exceeds the specified amount, or when there is an unusually large variation in the rotation speed of the front and rear wheels (ex. when trying to get unstuck), control is temporarily suspended in order to protect the 4WD system. When this occurs the 4WD warning light flashes to indicate the situation to the driver.