ASC (Adoptive Shift Control)

ASC automatically shifts or hold at the 3rd or 4th gear on certain roads (up/down slope and curve) and driving condition.

Fig 1: Identifying Driving Position Condition

Courtesy of NISSAN MOTOR CO., U.S.A.

When Driving on an Up/Down Slope

ASC judges up/down slope according to the angle of accelerator pedal and vehicle speed. Holding gear at the 3rd or 4th on an up-slope prevents shift hunting and controls the vehicle to gain maximum driving force. On a down-slope, automatic shift-down to the 3rd or 4th gear controls to gain maximum engine brake.

When Driving on a Curve

TCM receives side G sensor signal from ABS actuator and electric unit (control unit). Holding gear at the 3rd or 4th based on the signal prevents shift-up and kick-down and controls to drive smoothly.