Renault Senic 2005 2.0 Electronic Clutch?

I every one
I own a Renault Senic 2.0, it wont engage a gear except if i get the RPM's 100%, I think it could be a loos wire on the electronic system of the clutch that kicks the clutch in, I had it taken to the dealers and they want to replace the whole clutch kit at 15K ZAR +- €1500.00. If there is sum one that can assist me or give me a diagram of the clutch kit then I can have a look for my self.
Thanks