Does anyone have a wiring diagram for a fiat punto 1.8 hgt? I need to locate the earth wire for the ecu (won't start)

Invest in a Haynes manual, seriously, well worth it!

Well worth it because it dosen't cover Hgt's?

If you do get a copy of the workshop manual, be sure to double check any electrical information contained in it, I know the ecu pinouts are listed wrong for a start.

Disconnect the big multi blocks and take the ECU off the inlet manifold. You will find a short black wire with a 6mm ring on the end either hanging loose or holding the ECU onto the car. It bolts to an impossible to find screw somewhere at the back of the manifold to the left (cam belt) side of the ECU.

Mine now has a larger ring washer crimped on and its under one of the engine mounting bolts.