I appologize in advance, I have been hunting for the testing procedures for the CPS. I cannot find the test procedures but there is a lot of discussion of this infernal beast.
Can someone post this or provide a link, I have an 89 Cherokee, 4.5 RE lift, 4.0L, it started fine yesterday, now it won't. Cranks fine. It did this a few months ago and I had the CPS replaced cost 140.00 bucks. I figured if it was the same I would save 100.00 and replace myself.
on an 89, you should read approx 200 ohms across the terminals.
open and dead short both indicate problems!
I'm guessing, that you'll see a dead short, and that the place that replaced it didn't tie the wire out of the way and it burned off on the exhaust manifold. (the insulation around it can last a few months before it burns through enough to cause problems)
pull the wire up from the connector a little and inspect for signs of heat damage. I have seen this WAY too often.
if the intake manifold heat shield is gone, that doesn't help either (grab one from a junkyard and put it on)