This is probably not a great deal of help, but a start.
There are two senors on the back of the head, one of them is used to sense when the cold start injector should come on (should be easy to work out which one it is). One sensor is green one is brown, one measures the water temp and the other is for cold start.
On my 4AGTE I have an 86kw throttle body and the wax pallet is hooked up to the coolant lines (this works perfectly on cold start ups on mine running a microtech, starts first go down to minus 7 degrees), but the ZE throttle body is a little different I think, it's not quite so simple??
I don't use the extra injector on mine either.
Others who are more knoweldgable will probably reply soon and offer more help.