0411 swap now to 12586243 for flex fuel

[chevy052500hd]

I originally converted my 2000 s10 to 0411 pcm, I noticed of off holdencrazy a s10 tune 2003 had e85 tables. It looks like the 12586243 pcm has the same wiring as the 0411 pcm. Just the obvious differences 1mb flash etc. I am going to swap this on into my truck and also pick up a flex fuel sensor see if I can turn my truck in a automatic flex fuel truck. This may also work on vortec v8's too. I will keep you guys posted. By the way does anyone know where I can pick a sensor up cheap, other than the deal. I am going to call salvage yards tomorrow to see if I can locate em. Oh and how does the fuel sensor hook up, on the return line? I noticed that it looks like it has a 5/16" and 3/8" hook up

[GMPX]

There was actually a 2002 OS (12216125) for flex fuel that will run on the 0411 PCM. Here's the problem, the sensor from GM is around $400
It just goes in the supply fuel line, if you search the internet for 'GM Flex Fuel Sensor' there is lots of sites, mainly people asking where to buy one for less than $400, because they seem to fail a bit, so maybe a used one isn't a good idea.

Cheers,
Ross

P.S - I considered the conversion myself, but the sensor cost scared me off.

[chevy052500hd]

I looked at that cal, but wasn't sure if it would work with the 96 - 00 vortec style engines. It was set up for multiple coil packs not a distribitor or it doesn't matter? I know the whole 400 bucks is annoying.

thanks,

kurt

[GMPX]

0411 PCM still needs the 24x sensor.

[chevy052500hd]

did the old vortec boxes use a 24x sensor too? When I did my swap to the 0411 I didn't change anything as far as sensors. I also looked at the wiring diagrams, on a v6 cal the c2 26pin is ic timing control on the v8 cal it is just for ic 1 control. I thought of the 12586243 box, because it has exactly the same wiring and the system cal should work with my engine. I don't believe they changed the sensor on newer 4.3l engines. Only thing I can find in SI is the v6 puts out 3 digital pulses and a v puts out 4 digital pulses. The 12586243 box looks like it is just for the 4.3L engines and doesn't have any etc cals either, which I don't need them in my truck still have a cable.

thanks
Kurt

[chevy052500hd]

I just received my 12586243 pcm. I swapped my red caps for green caps, install the pcm, loaded a stock cal for a s-10 2004 4x4 and did the vats relearn and it works!!!! Gauges and all! So it can be done, for some reason I couldn't get the os you were talking about to work with my s10. Even after the vats relearn it wouldn't start with changing the appropriate cals for the v6. With this pcm it works, so now I have all my e85 tables I need, now just awaiting a pcm license to alter the stock tune. I am suprised everything works, since my truck is a 2000 that came with the vortec box. Real close to making it a flex fuel truck.

[Aloicious]

I just received my 12586243 pcm. I swapped my red caps for green caps, install the pcm, loaded a stock cal for a s-10 2004 4x4 and did the vats relearn and it works!!!! Gauges and all! So it can be done, for some reason I couldn't get the os you were talking about to work with my s10. Even after the vats relearn it wouldn't start with changing the appropriate cals for the v6. With this pcm it works, so now I have all my e85 tables I need, now just awaiting a pcm license to alter the stock tune. I am suprised everything works, since my truck is a 2000 that came with the vortec box. Real close to making it a flex fuel truck.

whoa, this is interesting, I wonder what other benefits the 12586243 pcm holds? I may have to look into that. hmmmm. interesting. you said the wiring was the same as the 411? do you have a wiring diagram or schematic or something for it? what motor are you running in your '00 S10?

BTW, the L31 vortec's use a 4x crank signal, not a 24x (although there may be a way to upgrade in the near future). so a non-24x signal still works, just need the correct calculations in the 411 tables to make it work, because the 411 does use a 24x signal system (this is what GM did with the '02 x-van using an L-31 vortec with a 411 pcm).

[Aloicious]

I found this info as well:

For 2003, the Gen III PCM for trucks was upgraded with an even faster version of the Motorola 68000 chip. The same upgrade was rolled out on the car side in 2004 Vette and GTO. The flash memory was now doubled from 512 kilobytes to 1024 kilobytes, to help facilitate further expansion of control coding.
Externally, the new PCM was identifiable by its 'green' connector (replacing the 'blue' connector found on '99-'02 PCMs). This PCM would remain basically unchanged through its remaining usage up to 2007. However, several service codes existed due to internal manufacturing or sourcing changes, such as Intel-brand flash memory or AMD-brand flash memory.
This brand-swapping was fairly transparent to the user, but caused tuning and diagnostic tools to be re-designed to ensure compatibility. The service codes for '03-'07 include 12576106, 12586243, 12586242, 12583560, 12583561, and 12589463. These PCMs are interchangeable, with a complete re-flash of the appropriate operating system. Thanks to its fast processor and large memory, this PCM is considered the optimal choice for LS1 transplants
----------------------------

Consider even using a slow scanner that is doing a request/reply for each PID being monitored how much more clock and bus is being taken up.
Or like a Corvette that has lots of other electronic modules that are also taking up OBD 2 time, heck even the seat or side mirrors on a vette talk and anytime more clock can be gotten the better then PCM is to make more decisions as to the adaptive strategy.
Add the expanded memory space from 512K to 1 meg helps as GM made use of that space for good reason to tables.

I have been using a 2003 PCM in my 1999 C5 and could even see some improvement over the 99-02 PCM and GM did not jump to a 40 Mhz CPU for the E40 PCM for no reason.

No different then people buying a new P/C because the CPU was slow on what they had and did a lot of number crunching suh I as do in spreadsheets for tuning.

In any case I am testing this week using a 04 PCM with 03 and 04 flashes in it to see what differences there is by removing the stock flash chip and installing a IC socket so flash chips can be plugged in to test different flash configurations.
Cannot hurt also having a higher clock speed to better the data and address lines.

Just think that 99-02 CPU is only 16.7 Mhz clock/CPU if and a 40 Mhz CPU was used with 2 meg flash in a 08 PCM

taken from:http://www.gmhightechperformance.com...ms/page_2.html

[chevy052500hd]

whoa, this is interesting, I wonder what other benefits the 12586243 pcm holds? I may have to look into that. hmmmm. interesting. you said the wiring was the same as the 411? do you have a wiring diagram or schematic or something for it? what motor are you running in your '00 S10?

I am running the stock 4.3L v6 engine in it. Originally had the vortec box, then swapped to a 0411 , then now swapped to the 6243. I have diagrams for just about all gm up to 2004 an some 20005, buddy of mine score a DVD copy of SI for free. I am thinking this may be a option for vortec v8's, because guys that did 0411 swaps had to use a cal from a s10 to get their 4x4 to work properly. I sent a copy of the stock that I am using now, to holdencrazy's email. It was outta a 4x4 s10 2004 with a 6243. All modules work with the swap, only thing I have noticed is the tach is off, which would prolly be corrected by getting a new cluster, but am not to concerned about that right now.

BTW, the L31 vortec's use a 4x crank signal, not a 24x (although there may be a way to upgrade in the near future). so a non-24x signal still works, just need the correct calculations in the 411 tables to make it work, because the 411 does use a 24x signal system (this is what GM did with the '02 x-van using an L-31 vortec with a 411 pcm).

If that is the case then the v6 uses a 3x crank signal. I remeber reading that in SI. I haven't changed anything and it works with this computer. Hmmm. What tables control this? Maybe this is why my tach is off.

Later
Kurt

[Aloicious]

I am running the stock 4.3L v6 engine in it. Originally had the vortec box, then swapped to a 0411 , then now swapped to the 6243. I have diagrams for just about all gm up to 2004 an some 20005, buddy of mine score a DVD copy of SI for free. I am thinking this may be a option for vortec v8's, because guys that did 0411 swaps had to use a cal from a s10 to get their 4x4 to work properly. I sent a copy of the stock that I am using now, to holdencrazy's email. It was outta a 4x4 s10 2004 with a 6243. All modules work with the swap, only thing I have noticed is the tach is off, which would prolly be corrected by getting a new cluster, but am not to concerned about that right now.




If that is the case then the v6 uses a 3x crank signal. I remeber reading that in SI. I haven't changed anything and it works with this computer. Hmmm. What tables control this? Maybe this is why my tach is off.

Later
Kurt

there are alot of tables that refer to the 24x signal so I'm not sure which one would relate to the tach being off, I'll check around and see if I can find anything tonight at work, I'm running the 411 in my '96 right now with a tune based off of the '02 express van on holden crazy (mines not 4wd, so I didnt need to switch to the s10 calibration)

I may have to try the swap as well, I've got an extra license I'm probably not going to use so why not 'eh?

where did you end up getting the green connector sleeves at?

let us know if you find any other issues or benefits from the swap.