checksum error last byte

[Kelly Parker]

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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