"D2" Position

The forward brake and the forward one-way clutch regulate reverse rotation of the mid sun gear.
The 3rd one-way clutch regulates reverse rotation of the front sun gear.
The direct clutch is coupled, and the rear carrier and rear sun gear are connected.
During deceleration, the mid sun gear turns forward, so the forward one-way clutch idles and engine brake is not activated.

Fig 1: Power Transmission D2 Position Diagram
Courtesy of NISSAN MOTOR CO., U.S.A.