GM Code Location

[Jennifer Rose]

At 08:16 PM 1/25/98 +0100, you wrote:
>martin at mgass.demon.co.uk schrieb:
>
>> Carl wrote about checksums :
>>
>> ...Looks to me like most data areas and even the code is protected by 
>>
>> checksums ?
>>
>> ..Sounds right to me....some time ago I worked on a mil project with 
>>
>> an ex. Delco guy and he wanted to checksum code, data,.. everything !
>
>As far as I know most ECU´s don´t calculate the checksum of the whole binary 
>file. I guess they calculate the checksum pagewise. So if you modify a map the 
>correction of the checksum should be done somewhere near your modifications.
>
>Regards
>
>Alex Wenning
>wenning.motorsport at t-online.de
>
>Hi All

        The checksum for gm 165 ecm. The code calulates checksum of 0009
thur 3FFF. If ya modify anything must recal total at 0006,7. Gm 730 ecm code
is similar

Vance
>