I remember finding a post or a web site a while back that walked through the different types of variables that are controlled by the ECM. My memory may not serve me well, but I think it said there were four types of variables:

a) flags (on/off), e.g. turn EGR on or off
b) single variables, e.g. speed limiter
c) two dimensional tables
d) three dimensional tables

It was a good "intro" type discussion, which is what I really need now that I'm trying to understand how to burn a chip for my swap from an L03 305 to a 350 H.O. crate motor. Does anyone know where this information can be found? I have searched old posts here and I've also checked out www.diy-efi.org but just can't seem to find it.

 

https://www.thirdgen.org/newdesign/tech/promintro.shtml

 

Flags, Values, Arrays (as seen in Winbin). These are the info the ECM uses to operate the engine and trans. The 3D maps are just a representation of information in some of the tables (eg Spark, EGR). The tables themselves are contained in the Values and Arrays catagories. MAF tables, spark tables, etc.

Don't remember seeing a web page that describes these but it may have been a thread on this board.

 

Just found it...it's contained in the PROM programming tech article...thanks Traxion