Prom problem?

[Scott Pearson]

Pardon my ignorance here, but do you have to do something other than remove
all power to clear the memory?

Scott

----- Original Message -----
From: "Bruce Plecan" <nacelp at bright.net>
To: <gmecm at diy-efi.org>
Sent: Tuesday, March 06, 2001 10:48 PM
Subject: Re: Prom problem?


>
> I run both an ecm power interupt, and clear memory switch for in cab
memory
> clearing and anti theft.    I always feel better after a memory clearing,
> dunno about the ecm thou, but Doc says in mind meld mode, he says the ecms
> like to have a complete power down from time to time
> Bruce
>
>
> > Evening gents,
> >
> > This seems like an elementary thing but for someone that is new to
> > electronics this might not be so intuitive.  especially when, as yall
have
> > pointed out, the CPU gets power from several places.    this is one of
> those
> > things that gets forgotten when helping a new person start doing the
> editing
> > boogie.
> >
> > I have been looking into emulators, & one of the things that the tech
> tools
> > emulator provides is a RESET or ~RESET line that you connect to the
> target.
> > the emulator pulls the reset line before it downloads the image & then
> when
> > it is done with the down load (& the check if turned on) it lets go of
the
> > line.  this forces the CPU (& anything that has a RESET) to come up &
> start
> > as if it were first turned on.  for this reason, I have been checking
this
> > out on my 7730 CPU & it would be rather simple to wire this up to a
> > momentary (although I would hate for the switch to short to ground as I
am
> > doing a buck-20), for this purpose.  I have to find it anyway for the
> > emulator, so.......... just a thought.
> >
> > thoughts?
> > BW
> >
> > -----Original Message-----
> > From: owner-gmecm at diy-efi.org [mailto:owner-gmecm at diy-efi.org]On Behalf
> > Of Bob Valentine
> > Sent: Tuesday, March 06, 2001 10:51 AM
> > To: gmecm at diy-efi.org
> > Subject: Re: Prom problem?
> >
> >
> > You're supposed to unplug the ECM every time?   (*grin*)
> >
> > I have a NC pushbutton switch that I've been meaning to put inline with
> > power to the ECM for easy resets.
> >
> > -> Bob Valentine
> > -> bob at tecmark.com
> >
> > At 12:52 AM 3/6/2001 -0700, you wrote:
> > >Is he perhaps leaving the PCM plugged into the harness when doing the
> chip
> > >change ?
> > >
> > >Lyndon.
> > >-----Original Message-----
> > >From: Bob Valentine <bob at tecmark.com>
> > >To: gmecm at diy-efi.org <gmecm at diy-efi.org>
> > >Date: March 5, 2001 9:51 PM
> > >Subject: Re: Prom problem?
> > >
> > >
> > >>I've had this occasionally with my '730 (running 730 code *^),
> Reseating
> > >>the eprom usually fixes it.   Sometimes the idle goes wierd after a
new
> > >>chip, quick cycle of the power to the ECM fixes it every time.
> > >>
> > >>I've learned is to watch the CEL after putting in a new chip.  If it
> > >>doesn't do one quick blink after power up, something's wrong.
> > >>
> > >>-> Bob Valentine
> > >>-> bob at tecmark.com
> > >>
> > >>
> > >>At 08:07 PM 3/5/2001 -0600, you wrote:
> > >>>Well I'm having a slight problem with the 749 code in the 730.  Seems
> > when
> > >I
> > >>>swap chips the ECM wants to get a check engine light and run like
total
> > >>>crap.  I pull the power and EPROM and swap everything back and forth
> and
> > >>>after a couple times and then it works.  Anyone know a way around
this?
> > >>>Like something that works almost all the time.
> > >>>
> > >>>Dan
> > >>>
> >
>
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