: Re: LS1 - Flash - Reprogramming

[Len Sabatine]

   Export software is cool for Hot Rods , especially since it doesn't  do 
Module ID Match as does Domestic Production Software.
   Reverting to OBD1 style  emission hardware should really be the ticket 
for retrofit work.   Module Match began in 99 MY.
   There are numerous Non North American cals , although not so useful 
without Xport Vin Ids. Good work , since LS1 "Family"
   Engines are used across  Pass / Truck platforms now. Previous PCM/VCMs 
in trucks were same , just software changed to
   match specific 4.3 , 5.7 or 7.4 L. In light of GMs consolidation efforts 
of late , I wouldn't be surprised if the 8.1 would be included,
  as you suspect. Have Tech2 will travel , if you have Vin Id ! Unfortunate 
, not all folks can use Xport SW for inspection reasons.
  Yes ,OBD2 Flash can be dumped with the appropriate programmer and chip 
algos , lots of work to sweat SMT's off the Motherboards.
  While we're at it, 2001 MY does WOT CL Fuel Control ! Not sure if Xport 
SW does this.
   Len

>Andrew, Bob, and others:
>
>After many hours of investigation I am able to reflash the LS1 PCM's with 
>an export VIN for my streetrod engines. This allows me to set the engines 
>up w/o EGR, cats, A.I.R., or post-cat O2 sensors, which is what most of my 
>customers prefer, but it would sure be nice to do much more with the 
>calibration!!   I have access to a few of the chips; Intel flash 28fn400 
>??......I don't have one in front of me, that is probably not the exact 
>number.  What programmer are you using to read these?  It looks like a 44 
>pin chip; do they sell an adapter for it, or is it DIY?  Also if someone 
>is going to dig deeply into this, I would suggest starting with the 99 and 
>newer box.  The 97-98 LS1 PCM was obsolete after 98, while the 99 and up 
>covers the Gen 3 truck engines as well as the LS1's. Although I don't know 
>for sure I am guessing the new L18 big block (8.1L ,496 C.I.) probably 
>uses this same box since it is 24X, SFI, and coil per cylinder like the 
>above engines.
>
>                 John
>
> >Bob wrote:
> >>
> >> I have recently gained an interest in having the ability to custom program
> >> the LS1 ecm. People are obviously doing it but there doesn't seem to 
> be any
> >> "end user tools" yet. Reviewing the list for the last couple of months 
> I saw
> >> that Andrew K. Mattei was getting into the flash memory of an LS1. Andrew
> >> can you tell me where you are with this?
> >
> >
> >I got the chip off the board, put it in the programmer, and read "FF"'s.
> >Need to do some troubleshooting on my piggyback board. Those chips are
> >VERY fragile, so I hope that I didn't break anything. I don't think I
> >did, but still need to do some looking.
> >
> >> As I understand it the obd2 specification requires encryption of the data
> >> going to / coming from the ecm. Has anybody broken this encryption?
> >
> >
> >None of us, AFAIK. Steve Cole, yes. Hypertech, yes. Us (anyone on this
> >list, AFAIK), no.
> >
> >> If the encryption has not been broken that means the flash memory must be
> >> accessed directly. From what info I have been able to gather (having not
> >> opened an ecm (yet)) the flash memory is surface mount technology. 
> Does that
> >> mean that the current "turners" are unsoldering, reprogramming, 
> resoldering
> >> the surface mount flash memory chip (doesn't sound like fun to me!). Maybe
> >> there is some other way, I hope.
> >
> >
> >No, they are not desoldering. I do not see how you could successfully
> >remove, program, resolder one of these chips without coming close to
> >frequently breaking them. It's that fragile.
> >
> >> I also see that Steve Cole has this power loader there appears to plug in
> >> somewhere. Does anybody know how this works.
> >
> >
> >I've talked to him about it. You tell him what you need for your LS1, he
> >ships you a custom program built in to a Powerloader. You plug it in to
> >the car, hit a button, and bam, that's it. No options, no reversal. If
> >you need something changed, you send him the powerloader, he changes
> >stuff, he sends it back, you hit the button, bam. It's programmed. It's
> >basically a one-shot device, unless you need a reprogram. It beats
> >having the PCM lost in UPS land for days, though.
> >
> >
> >- -Andrew
> >- 
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>
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