The micra has an electrohydraulic assisted direction, that is, it does not carry hydraulic pump dragged by the motor of the car, but it carries a hydraulic electric pump that provides the necessary pressure for assistance.
This electric pump is connected and disconnected when you turn the steering wheel, through motion captors and an electronic module that governs the system.
What you can do is refer to the car use manual and see which is the fuse in the box to see if it is molten, also look at the manual in the \ "levels \" or \ "lubricants and capabilities \" or something like that, where they will come in detail where the caps are to replenish the brake fluid, the antifreeze, the water of the clean, the engine It is more than anything, because as fellow ratmud says, it is possible that the oil is out of a leak and the tank is empty.
If everything you can touch is fine, and the problem persists, prepare the portfolio and take it to the workshop because the breakdown can be \ "fine \".
All the best.