checksum error part two

[Kelly Parker]

Thanks, it seems the car has "healed" itself. Sure wish I knew what caused 
it in the first place.

I work as a WAN tech. for IBM. I just live on a farm, the only thing I grow 
is jalapenos and tomatoes.
Kelly


>From: Shannen Durphey <shannen at grolen.com>
>Reply-To: gmecm at diy-efi.org
>To: gmecm at diy-efi.org
>Subject: Re: checksum error part two
>Date: Wed, 07 Jun 2000 21:31:46 -0400
>
>Sometimes scan tools can cause strange problems.  Especially when
>there are several devices communicating over the same data line.  I've
>seen SIR, ABS lights illuminate, false trouble codes, generally poor
>vehicle operation all caused by fooling around with key on/off scan
>tool connected/disconnected.  Best one seemed to be the Tech 1, worst
>one seems to be Snap-on.
>
>Shannen
>You know technology's moving along 'cause even the farmers have scan
>tools.
>
>
>Kelly Parker wrote:
> >
> > OK I get it. the oil pressure switch is feeding the fuel pump. Just like
> > it's supposed to. It took 10 seconds of reading the schematic to figure 
>that
> > out......Duh.
> >
> > So what caused the checksum error. Maybe some interferance in the scan
> > cable?
> >
> > KP
> >
> > >From: "Kelly Parker" <bigblockfw at hotmail.com>
> > >Reply-To: gmecm at diy-efi.org
> > >To: gmecm at diy-efi.org
> > >Subject: checksum error last byte
> > >Date: Wed, 07 Jun 2000 14:41:37 PDT
> > >
> > >I've run across a rather strange problem. I took my car for its second
> > >drive
> > >around the farm and upon acceleration it coughed badly. That's not the
> > >strange part. I scanned for error codes and the fuel pump would not 
>shut
> > >off
> > >with the key on run, engine off. I unplugged the scan cable, fuel pump 
>did
> > >exactly what it's supposed to do(ran for 2 seconds and stopped)I 
>removed
> > >the
> > >fuel pump relay, no more running pump, I run pcmcomm and get checksum 
>error
> > >last byte.
> > >
> > >The last time I scanned the car a lot of codes flew past the screen but 
>no
> > >checksum errors. I thought I would start the car (and run it till it 
>was
> > >out
> > >of gas which I thought would take about 2 seconds) when I started the 
>car I
> > >could hear the fuel pump start running. It ran until I turned it off.
> > >
> > >I have not reprogrammed the car since the last time I scanned it.
> > >
> > >With that said here is the question. Is it possible that the fuel pump 
>is
> > >somehow shorted with something else? Duh, It's obviously getting power 
>from
> > >somewhere coz' it's running. I thought I had it wired correctly but the
> > >checksum error and the fuel pump thing happened at the same time. prior 
>to
> > >"cleaning up the wire routing" they both appeared to work right. 
>Anybody
> > >have any idea what happened here?
> > >I do not believe it has anything to do with the checksum. I think that 
>is
> > >some strange side effect of my fuel pump wiring.
> > >
> > >I'm gonna go check the wiring again.
> > >
> > >over fueled, under scanned,
> > >Kelly
> > >
> > 
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