It uses an external switchbox to physically turn off the injectors. When you say he can't do the cutout test, I don't understand. Based on this, your truck should have an IDM-120, but again it doesn't matter which one is installed. The earlier IDM's were marked IDM-100, a little later was IDM-110, and the ones that came on 99& up were marked IDM-120 (this isn't hard and fast, as I've seen one or two exceptions). Like I said, it doesn't matter which model your IDM is, as long as it came from a 94 thru 03 7.3L truck or van. Re: Bad IDM Injector Driver Module New Information
