Trans. Automatica does not pass the marches.

I need help with my car Hyundai elantra year 1993 with automatic transmission. I hope the theme can help me is as follows: the engine is based on the brake and select with the lever a march whatever D, R, 2 or L. The car does not go just accelerates as it is neutral, check the level of ATF oil in idle and find it low level, relax and nothing follows the same wants to be some fuse, reluctant or want an electronic failure. Please help me, I would appreciate them. From hand thanks Muxachos ....