Renualt trafic dci115 wiring diagram 2008

Hi I have a 2008 traffic dci115. It has a fault that effects the revs of the engine making them go up and down and the dash speedo also goes up and down. We have changed the abs sensor and this didn't work. It doesn't have a sensor on top of the gear box My mechanic thinks it could possibly be a wiring fault. Would anyone have an idea were I could get a wiring diagram from?
The only fault code is for the alternator. Could this be having anything to do with it?

many thanks in advance

Renualt trafic dci115 wiring diagram 2008