Renault Scenic injection fault car wont start

I may be biased,with good reason,but it's a Renault so that usually shouts at me that it's a fault in the wiring harness.
Not a lot of help I know,but I found faults in nearly every point in Renault wiring so best advice is an autospark.

I had the same problem. It turned out to be one of the glow plugs was faulty. Replaced the plugs then had to take the car a long drive after putting a 'Redex' type solution in the diesel tank to help with getting rid of the unburnet diesel at the CAT ... so far sorted and that was a couple of months ago. I had this fault for about a year and both the AA and RAC couldnt diagnose as it was intermitant and it didnt show up on their diagnostic computer