That's interesting, I don't think I've ever heard of a pcm and ecm on the same vehicle? I looked through two different databases, I didn't see it.
Sometimes the data bases use ecm and pcm interchangeably, I do it too. Usually, they use the term pcm when the computer controls both the engine and transmission. They use ecm when the computer only controls the engine. I couldn't find any info that showed your manual tranny is computer controlled.
As far as the fuel pressure, there will be an initial prime, where the relay is energized for a few seconds. If you have a hot fuel module, it may prime longer than normal. After that, if there is no rpm signal, the pump relay won't energize. Now, if there is an o/p switch in the fuel pump circuit, forget the relay, once you crank it enough to build oil pressure and that switch closes, the pump will run, there will be fuel pressure with or without an rpm signal. I don't believe the injectors will pulse without that signal. Some systems have the o/p switch, some don't.
The second database I looked at, showed the injectors get B+ from a different fuse than the pump.
I'm not sure it is safe to turn the key on, till you find the problem circuit. It's interesting.
Thursday, January 22nd, 2009 AT 12:45 PM