my battery reads 12.7 volts, as well as my cables. but, my car wont start. trouble code says crank angle sensor how to adjust? :confused:

Hey all. Friend of mine has a 1992 Mitsubishi Eclipse with a 1.8. It started missing a few weeks ago and the local garage diagnosed it as a bad injector. Long story, but somehow he wound up buying a remaned injector of the 'net for $60. I went to replace it last night, but before I did, hooked a 'noid up to the offending injectors harness and there was no signal from the ECM to that injector. Since I'm just messing around with this thing, pulled off the rest of the injector plugs one at a time and the noid lights up like it should. I even swapped a plug with current onto the non-firing injector to see what happens and the non-working injector starts working again. So, couldn't find a short or anything else that could be not causing a signal to this injector. I imagine I'm looking at having to replace the ECM? There could be a short somewhere along the line under the dash, but I suppose going to the wrecking yard and pulling a ECM for $20 and seeing if that makes the difference, is a lot easier than crawling underneath the dash for the day, looking for a break in the wiring. Could there be something I'm missing for this car, anybody with Mitsu experience that can point me to checking out something else that could be at fault? I hate just swapping parts and guessing.