Prom problem?

[Bruce Plecan]

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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