[Gmecm] P6 ECM information?

Fri Apr 7 02:38:36 UTC 2006

I've never used modula so can't comment, but anything is better than
writing assembly.  I say that as a person who does some of that for a
living.  It still comes down to assembler in the end, it's just that if
it was originally written in a higher level language and compiled it
will be more difficult to figure out what is actually going on.
Especially since compilers tend to optimize things away, and reorder
code to speed things up.

Another thing to keep in mind is that the 32 bit computers have 2 asics
in them that handle a lot of the fuel and ignition related I/O.  Neither
the ignition outputs nor the fuel outputs are driven by the CPU.  Both
come from the asics, called CIC (configurable ignition controller) and
TIO (timer I/O).  CIC interfaces to the 18x and 3x position sensors,
sends the data to TIO.  TIO acts like a distributor for DIS apps, and
also schedules fuel delivery.  The CPU communicates with these on a
higher level by programming advance, injector pulsewidth, etc.  The
asics figure out the details.  TPU is used for things like evap purge,
IAC, linear EGR, etc.

I think these boxes are a great starting point for home grown code, but
there's a lot that needs figuring out, particularly the TIO and CIC.  I
think it'd be fantastic to get the efi332 code bases compiled and
running on a GM box.  Maybe it can be done by ignoring the CIC and TIO
and just using the TPU.  Or maybe you can be the guy who figures out the
CIC and TIO!

730 won't do sequential because it doesn't have enough drivers.

regards,
--steve 

> -----Original Message-----
> From: gmecm-bounces at diy-efi.org 
> [mailto:gmecm-bounces at diy-efi.org] On Behalf Of Ryan Hess
> Sent: Thursday, April 06, 2006 5:39 PM
> To: gmecm at diy-efi.org
> Subject: RE: [Gmecm] P6 ECM information?
> 
> I'm working with the 7730 right now, and would like some 
> extra code  space and processing power.  I'd like to be able 
> to experiment a  bit...  For instance, I'd like to be able to 
> toggle between batch  fire and sequential to see the 
> differences in fuel economy and idle  quality.  Is it worth 
> it to an average user?  I don't  know...  I think it would be 
> neat to find out.  The 7730  isn't fast enough to do 
> sequential... at least I don't think so.   It appears to be 
> pretty bloated as-is.  I'd also like some more  I/O available 
> to add some extra features.
>   
>   Modula doesn't sound very nice.  Aside from getting the 
> source code, is there any way around the compiled code?
>   
>   Ryan
> 
> Steve Ravet <Steve.Ravet at arm.com> wrote:  Ryan, are you 
> writing your own code that you've run out of memory and CPU 
> cycles?  The 32 bit computers should have plenty of both, and 
> there are tuners available for them.  tunercat has a package 
> for the 96 and 97 pickups, and probably others as well.  I'm 
> currently working on a USB<-> VPW cable that can be used for 
> scan tool and reflashing functions on these computers.
> 
> These computers are programmed in a version of modula, so 
> there won't be any commented disassemblies.  I do have some 
> information on the internals of these PCMs, I need to get it 
> posted one of these days.
> 
> --steve 
> 
> > -----Original Message-----
> > From: gmecm-bounces at diy-efi.org
> > [mailto:gmecm-bounces at diy-efi.org] On Behalf Of Ryan Hess
> > Sent: Tuesday, April 04, 2006 9:28 PM
> > To: gmecm at diy-efi.org
> > Subject: [Gmecm] P6 ECM information?
> > 
> > Hi everone,
> >   
> >   I'm investigating possible upgrades for my P4 computer.  At the  
> > moment it doesn't have enough processor power or free 
> space.  I  found 
> > some information about the P6 family with dual processors 
> and a  27512 
> > eprom and/or flash memory.
> >   
> >   Now as far as I know, these are the ECMs you'd find on the OBDII 
> > LT1's  and other cars.  Or maybe I'm all mixed up and what 
> I'm really  
> > talking about is a P66?
> >   
> >   At any rate, if the dual processor ECM is the LT1 ECM, I 
> know these  
> > have been hacked, or at least enough to create the programs 
> out there  
> > such as LT1edit (?).  Are there any commented  
> disassemblies???  Maybe 
> > more importantly, are there any schematics  of these ECMs?  
> Or ANY ECM 
> > a few steps above the P4?
> >   
> >   Thanks,
> >   Ryan
> > 
> >    
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