It could be the engine brake.
http://forums.nicoclub.com/cvt-transmission-engine-braking-mode-t479637.htmlIt mentions Nissan has this engine brake default setting is on. I checked Latio service manual. It also has this setting.<page 59 cvt.fm>“ENGINE BRAKE LEVEL”0: Initial set value (Engine brake level control isactivated)OFF: Engine brake level control is deactivated.Another interesting read.http://www.nissan-global.com/EN/TECHNOLOGY/OVERVIEW/active_engine_brake.html
You can try but I don't think it will be free.