PCM operating logic

[FS560]

Does there exist, anywhere, a narrative or outline of the operating logic for the 99 and up PCMs.

I would like to read how the computer uses various inputs and flat file (map) lookup values and what changes what.

For example. If the knock sensor detects detonation, does it immediately go to the bad gas map or does it start rolling back on advance until the detonation ceases?

If the PCM goes to the bad gas map, are other operating parameters affected, like fuel delivery or even torque management and shift points?

Thanks,
Jim

[RedHeartbeat]

Personally, I would go to LS1Tech.com and search there for the answers. They have an entire topic area dedicated to PCM programming. There is a lot of really good info there plus many users/programmers online.

[Gordy M]

Originally posted by FS560@Aug 17 2005, 01:35 PM
Does there exist, anywhere, a narrative or outline of the operating logic for the 99 and up PCMs.

I would like to read how the computer uses various inputs and flat file (map) lookup values and what changes what.

For example. If the knock sensor detects detonation, does it immediately go to the bad gas map or does it start rolling back on advance until the detonation ceases?

If the PCM goes to the bad gas map, are other operating parameters affected, like fuel delivery or even torque management and shift points?

Thanks,
Jim

Does there exist, anywhere, a narrative or outline of the operating logic for the 99 and up PCMs.


try this link, it is on the GM Australian LS1 but pretty complete

http://carprogrammer.com/Z28/PCM/LS1/Holden_LS1.pdf

Because of EPA requirements, mfrs are required to keep the code secret and locked in the PCM on OBD2, you have about 80K of 512 that can be programmed. The remainder is firmware.

[RedHeartbeat]

Won't let me in!!!!

[FS560]

Site not found for me either.