Back-Up Control (Engine Brake)

If the selector lever is shifted to 2 position while driving in D4 (OD) or D3, 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: Graphing Line Pressure (Back-Up Control - Engine Brake)

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