No CEL or scanner communication

[Programmer]

Sounds like your scanner is completing a circuit to allow a running
condition--really check over the main wiring in your car, including
especially the grounds !! Remember--those smaller wires from the main
battery connections are important...

LW

-----Original Message-----
From: Cameano at aol.com <Cameano at aol.com>
To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
Date: October 13, 1999 2:58 PM
Subject: No CEL or scanner communication


>Hi, all,  my name is Darren Pferdehirt, I'm new to the list, although I was
>subscribed about a year ago for a couple of months.  I've come back seeking
>some help with a friend's car.  It's an 89 Pontiac Firebird, 2.8l PFI,
manual
>trans, a/c car.  The car was running fine until this last Sunday.  It was
>shut off, and a couple of hours later, when he went to restart it, it
>wouldn't start.  I took a look at it, and determined that it wasn't getting
>any fuel.  So I went to hook up my Snap-On MT2500 scanner, but when I hook
>up, and turn on the key, it won't communicate with the ecm.  Also, there is
>no Check Engine Light, but I've pulled the dash and verified that the light
>is in fact good.
>
>Not having a good reference manual on this car, I went to Alldatadiy.com
and
>subscribed for this car.  From the info I've gotten off the site, the only
>problem I can find is the ckt 340 (fuel pump oil pressure switch) is open.
>Tracing the circuit, I see that it leads back around to the fuel pump
signal
>terminal on the ecm.  Is this a good indication that the ecm all of a
sudden
>just took a dump?  One note, when I had the scanner hooked up the first
>couple of times, the car would start, but it was in "limp home mode", very
>rich, poor running.  As soon as I would unhook the scanner from the aldl,
it
>would die, due to the fuel pump shutting down.  Now, it won't even to this.
>
>I do have another ecm from an 85 Firebird, with the 2.8 PFI, but auto
trans.
>I've tried swapping ecms with the same results, also swapping PROMs between
>ecms and trying both, with the same results.
>
>Anyone have any suggestions?  I'm at a loss here.
>
>Thanks in advance,
>
>Darren Pferdehirt
>Waipahu, HI
>