Back-up Control (Engine brake)

If the selector lever is shifted to 2nd position while driving in D₄ (O/D) or D_3, great driving force is applied to the clutch inside the transmission. Clutch operating pressure (line pressure) must be increased to deal with this driving force.

Fig 1: Line Pressure Characteristic (Back-Up Control) Graph

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