[Richard L]

Originally Posted by funatnight

The Cobalt is a direct injection engine.

Here is the ECM diagram: http://www.reachingoutministries.com/temp/LNF.html

This is great help.

The HFS-4 has a dedicated input for Di injectors. Just wire the red and green wire of the green harness to anyone of the DI injectors. If the ECU is easily accessible, you can wire them there.

Do you have a back view of the ECU?