Chrysler Repair: 96 Voyager starter and fuel pump problem, plymouth grand voyager, double failure

Question
Hello again Roland,
You helped me with a problem last May 14th that I thought might be fixed, but it has returned. My 1996 Plymouth Grand Voyager with 3.3 V6 has an intermittent problem where the starter motor and fuel pump will not work, always at the same time. It can be that I will try to start the van and it won’t crank, or the engine will stop for no apparent reason and then it won’t crank and I do not hear the fuel pump energize. But whenever it happens, the problem “self corrects” in less than 15 minutes, and then might reoccur minutes or months later. This has been going on for almost three years. You advised me to check some fuses and grounds. I checked the fuses and found nothing wrong and asked a mechanic to check the grounds. The problem didn’t happen again until two weeks ago. I am convinced the PCM is not grounding the coils on the motor starter and fuel pump relays.  I think that means one of five things:
1.   The PCM is not getting power
2.   The PCM can’t “find” ground
3.   The PCM has some internal malfunction
4.   Something signals the PCM to not ground the coils.
5.   Something else altogether.
When it warms up a little in Pennsylvania, I’ll start checking fuses and grounds again, but thought you might have some more suggestions about how I can figure out the exact cause. What do you make about the fact that the problem never last for long? One more thing, I’ve had the van to two shops for this problem and they never find any trouble codes stored. And of course, the problem won’t happen there.
Thanks again,
Vance  

Answer
Hi Vance,
I re-read the earlier q & a but didn't notice a mention of the double failure of the starter and the fuel pump.  
I don't have a '96 manual (rather the '95 and '98 and I have recent reason to believe that your '96, although its PDC box looks like the '98, the fuse assignments may differ) but my suggestion would be check and see when this condition exists whether you have 12v on starter motor relay pin socket 30 and on fuel pump relay pin socket 86 when you have the key in the start position and in the run position. Both those pins have a common feed from a 40 amp fuse in the power distribution box under the hood (but I can't be certain which fuse # it is but it is the A1 circuit; in the '98 it is fuse #23 but that may be wrong for you, check all 40 amp fuses or try substituting every 40 with a new one, one at a time, to see which one corrects the problem). If whatever fuse has a subtle crack in it that would be a probable explanation for the on again-off again behavior. If you have the voltage at the pin sockets above,  then check pins 85 of both sockets when you try the start position to see if those sockets are being grounded (show 0 ohms to ground) or not. If not, then there is a ground issue with the pcm. There is an outside chance of the ignitions switch being the issue, except that those relays are energized by separate sections of the switch, so that makes it much less likely. If you can't id the pins sockets #'s by looking at them, the relays, or the lid, let me know and I'll tell you which is which.
Please let me know what you find.
Roland