[Gmecm] Need ecu file for 1227303 ecm & checksum question

[Programmer]

Upload the bin file (or send to me) so I can see where the checksum is 
stored.

Lyndon

----- Original Message ----- 
From: "James Ortiz" <james7 at rocketmail.com>
To: <gmecm at diy-efi.org>
Sent: Wednesday, December 28, 2005 11:17 PM
Subject: [Gmecm] Need ecu file for 1227303 ecm & checksum question


> Hi,
> I have a 1988 Pontiac Le Mans 1.6L 4 Cly 5 spd man transmission with a
> 1227303 ecm. I wanted to change a few things so i pulled the memcal
> (ANAB 1727) hooked it to my programmer and read the chip. Ran the gmcks
> program on it and it says the checksum does NOT match calculated sum.
> Put the memcal back in the programmer and checked all the connections
> with a meter to verify good contact. Read it again and compared it to
> the first read and they were the same. Did a partial disassembly and
> checked the code at the start vector and it looks like valid code. I
> have not had the time to do a full disassembly.
>
> Concerned that i might have somehow damaged the memcal i put it back in
> the car to check it out. The car seems to be running fine. No check
> engine light. Jumped the aldl connector and all i get is code 12.
> Location 0008 in the bin is $53 NOT $AA so i don't think the checksum
> is being bypassed.
>
> Is it possible that there is a different checksum routine used with
> this ecm or do i just have a bad read?
>
> I have not been able to find a bin or ecu file from a 1227303 to
> compare.
>
> Anyone have any ideas?
>
> James
>
>
>
>
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