checksum error part two

[Kelly Parker]

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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