Cinquecento/Seicento 1.4 engine into a cinq (useful info and links)

With the Cinq ECU removed you can decide where to put your ECU
I found the easeies option was to fit where the cinq one was and route wires under tray and round back of engine, allowing the coil wires etc to come out where you need them.

For the wiring you need to connect:

cinq orange to punto orange
cinq pink/yellow not used
cinq black/white not used
cinq orange blue not used
cinq white/red to punto blue/black
cinq green/white is for temp gauge on dash
cinq black/purple to punto black/purple or black
cinq orange/green to punto brown/white
cinq green/yellow to punto green/yellow
cinq green/grey to punto green/grey
cinq red to punto blue
There is then a red/black that goes to the spare plug hidden underneath the battery tray that is for the ignition.





Then the ground with a ring terminal going to ECU casing
Punto engine loom ground i put onto gearbox ground connection that is shared with the body to gearbox ground. Works for me. Sanded and sealed for good connection.
I extended the crank sensor all the way around the back of the engine bay so it was out of the way from manifold etc, but you can run it wherever you feel fit.

Unplug the injector wiring from the stilo engine if you have it and plug in the punto wiring, this can now be connected to the punto loom.

Plug the 2 clips into the throttle body.
Connect up the lambda, the coolant sensor, the oil sensor, the MAP sensor and then the d4. The D4 may need to be extended if it you can not get it out of the way.

The reverse sensor can be plugged in along with the fan wiring and radiator switch.

A lower temp switch and even a lower temp thermostat can be made using this guide:

https://www.fiatforum.com/cinquecen...nq-sei-stat-cooler-running-gt-switch-mod.html

The stilo starter motor has strange connections on it so make sure you pay attention to how it comes off. There is a large ring that needs to clip into the plastic waterproof bracket, then a smaller one that goes over the bolt.