The ecm injector output is a "sinking" output which means it grounds the injectors to fire them. That makes it a fairly rebust driver but can still be damaged.
The noid light will tell you is you have an ecm problem or not. Each bank of three has it's own fuse so if one bank still fires and the other does not it most likely means a bad ecm. Just be sure you have continuity all the way from the ecm to the injectors before you declare the ecm bad.
welcome to the forum.
[This message has been edited by Dodgerunner (edited 10-14-2013).]