Nissan March CVT gearbox won't change up?

Hello all,

Can anyone give any advice on why the CVT gearbox on my 1994 March 1.3 won't change out of first?
The strange thing is that Reverse, Neutral and Park all work as normal but the gearbox just won't #### up. This is regardless of whether the selection is in D or DS. I really don't want to scrap this car as the spec is so good and it usually leaves the traffic light competition well behind. I'm thinking that maybe a sensor is at fault but don't know which one. I recently changed the ATF fluid and am worried this may have something to do with the problem but it was ok for 2 months after the change.

Any ideas?

Thanks
 
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