It could be a broken wire that you can't see because the rubber sheild is ok but inside the wire, it is broke. Most of the time, that happen around connectors. Try checking the resistance of each wire around connectors. Start with the 12v and ground around the PCM big connector.
12v=Red with white strips gauge 18
look at this, could interest you, I did not have time to read it
http://www.neons.org/neontsb/TSB/recall/rc614.htm