[Gmecm] Re: Gmecm Digest, Vol 14, Issue 5

[William Lucke]

I'd like to hear more about the structure of the later computers. In 
what applications was the 32 bit architecture used?

May I assume that when you mention 18x and 3x signals that you're 
referring to a 6 cylinder configuration?

Are the PCM's reconfigurable for different cylinder counts?


Will



> From: "Steve Ravet" <Steve.Ravet at arm.com>
> Subject: RE: [Gmecm] P6 ECM information?
> 
> 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