electrical fault from e.c.u to ignition for renault clio 1.2 1999?

hi, thanks for answering. I have taken it to a garage and they plugged the a fault finding computer into the car under neath the ash tray. it showed up a wiring fault between the e.c.u and ignition. the electician couldn't give me a price because he wasn't sure how long it would take him to find the problem. As the car is fairly old i didn't want to take the chance of him stumping up a £300+ bill for something i might be able to do. thanks

A. morgan