Pug205 cj for a Citroen Ax Gt

I was wondering if anyone can help me, i have just started to change the engine of
a pug 205 cj 1991 for the engine out of a citroen ax gt 1991, Everything is
fitting well, but ive just got one issus with the project, is that there is
a wire coming from the carb of the ax, and heading into the wiring loom. Anyway the
carb thats in the pug 205 has no such wire cominng from it. I am thinking the wire coming from the carb is something to do with choke,

if anyone can tell me if theres a way of getting this part of the carb to work or a clearer picture on how this works. Cheers