95 vs 96 pcm

[Ken Kelly]

Mike,

	The 96 PCM is a very different beast. There are actually
two different processor complexes in the PCM. The E side is
very similar from 95 to 96, but the T side made significant
changes to support OBD-II the T side processor went from a
512K Flash chip to a 1024K Flash chip, and changed the
memory mapping to accomplish this. You have to use an 8051
to run the 94-95 Flash. I can flash the 94-95 PCM's. I can
put the 95 Impalla SS or 95 Cop Car Flash into any 8051 for
you. Unless you are keeping all the accessories, you will
want to do some flash changes like turn off VATS, adjust for
rear end ratio & tire size differences, etc. I don't think
you will get far with a Dealer, unless you have a contact at
the dealership. Very few GM dealers really want to play with
the PCM. You give them a VIN, and at best they make your PCM
match that VIN.

	You can eliminate the egr etc, and put a resistor in place
of the solenoids to fool the PCM, or you can have these
"features" turned off in the PCM.

		Ken

Mike wrote:
> 
> Ken,
> 
>         Is the 96 a different pcm? Can it be flashed by the dealer with a 95 vin
> and become a 95 pcm or not? Im doing the same as you but with a 72 chevy
> p/u. I'm ready to drop the engine and tranny, so i have the harness at home
> rearanging it. Im going to put the pcm in the cab of the truck. Alos i'm
> eliminating everything i can, So far ive removed the abs stuff. What about
> the egr system and the canster purge system can the be removed with little
> effects on the pcm?
> 
> thanks
> 
> Mike
> Itsmike at lvcm.com
> 
> > -----Original Message-----
> > From: owner-gmecm at esl.eng.ohio-state.edu
> > [mailto:owner-gmecm at esl.eng.ohio-state.edu]On Behalf Of Ken Kelly
> > Sent: Tuesday, December 14, 1999 8:13 AM
> > To: gmecm at efi332.eng.ohio-state.edu
> > Subject: Re: 95 vs 96 pcm
> >
> >
> > Mike,
> >       I put a 95 PCM on a 96 camaro drivetrain. I am putting the
> > whole drivetrain in a 48 Ford. The 95 PCM will plug into
> > your 96 Harness. The only change you need to make is to the
> > knock sensor. The Knock sensor in the Block, and the ESC
> > module in the PCM must match. GM changed them both between
> > the 95 and 96 model year for the F-Body, I think they also
> > made changes in the B-Body. I put a 95 Knock sensor in my
> > engine, and all is well. The aftercat O2 sensors and Crank
> > position sensor are just not functional with the 95 PCM.
> >
> >       Using the 95 PCM eliminates OBD-II and makes tuning much
> > easier.
> >
> >               Ken
> >
> > Mike wrote:
> > >
> > > >
> > > >
> > > > I have a 96 lt1 out f a caprice with harness and pcm and was
> > > > wondering whats the advantages/disadvantages of the 96 pcm to the
> > > > 95 pcm? Im installing the engine in a older vehicle where i wont
> > > > have any cats and i know the 96 has 2 sets of o2 sensors vs only
> > > > one set in the 95. If i get a 95 pcm will i have to do any thing
> > > > to the harness to use it? what about a fbody pcm? what will the
> > > > pcm do if i dont install the 2nd set of o2 sensors? Will the car
> > > > be drivable just not preform to its highest or what?
> > > >
> > > > thanks alot
> > > >
> > > > Mike
> >