Hi,
Can anyone tell me details of which GM OBDII PCM/ECMs were based on 68HC11 microprocessors? I am looking for a test mule for my new read/program software for LT1. Where I am, LT1 PCMs are scarce and I am having trouble finding one at a reasonable $. Hope is that a '96 C1500 or Cavalier or other more common car will have both FLASH and 68HC11.
Thanks,
Tom
You are looking at something between 96-97 with 4 connectors and not a black casing. I will have to go through some files archive to see what can be found. I think some early diesels uses that cpu. Gm tis2web site can be your friend to figure by vin some files p/ns.
I had a look at the TIS2WEB but without a serial number they don't help you.
LT1s had four connectors... would a 4cyl Cavalier use the same case? I think the truck motors all have the black case, do they use the '332?
Diesel would be fine IF I can find one, again they are not too popular around here.
Wrecker here has about an acre of GM only However most are more modern. He doesn't think I will find an LT1 in the bunch. To find out I will need to walk through the field. He estimates an hour or so to see everything. Search continues.
BTW Software reading of the PCM now works a treat. Added a ton of failure messages (60 or so) in most places. Probably wrap this soon if I can find a test mule.
-Tom
https://www.ebay.com/itm/155712778141
https://www.ebay.com/itm/225919175669
Just found that 1996 l4 pcm is what you need. Some link for reference,
It is used on gramd am , cavalier and so on.
Beware that similar case pcm is used from 93-95 and it is obd1.
would you like a spare 1996-1997 f body ecm?
i have one here somewhere however i never plan to do anything with it anymore, no time
i believe it is not bricked but am not 100% sure, although im sure it would be a good candidate to sacrifice for socketing, which i would highly recommend
if you are in canada like your signature suggests simply send me your address in a pm and i will have it couriered to you
guys i sent tom 2x obd2 lt1 ecms today so i think he's good to go. i think one was originally from kur4o and the other one i forget but it might have one side bricked
should definitely be enough hardware to abuse for testing
Thank you, Can't wait to start the testing!Originally Posted by steveo
-Tom
Hi Tom,
Another potential source for 68HC11 OBDII ecm's is here:
https://www.ebay.com/b/Engine-Comput...596/bn_1362181
Daewoo used 1.8L, 2.0L, and 2.2L GM engines and electronics for a number of years. Some Isuzu vehicles also used GM engines and electronics. Here is a related thread with pictures.
http://www.gearhead-efi.com/Fuel-Inj...out-these-ECUs
This video has a bunch of really great shots of a Daewoo circuit board.
https://www.youtube.com/watch?v=Z4fxmOmV464
I have a Daewoo ecm that I'd love to be able to use in an upcoming project. I'd be happy to obtain a used one for testing if you want to work on one.
For reference, 1995 and newer J cars (Cavalier and Sunfire) use an external ecm as pictured above. 1993-1994 J cars used an interior mounted ecm. V6 J cars from 93 and 94 actually used a 1227730.
Thanks to everyone for the information + help.
I will soon have all the resources I need to do the testing. Fun part will be testing out this idea of Brick Free Technology using the EEPROM. Two loaders to be written. First (TSide) loads from the DLC using standard J1850ish commands. Second (ESide) needs to load from the SPI. Second is a bit tricky unless I can avoid working with the standard TSide support for comms with ESide.
Again, I appreciate the depth of knowledge here.
Thanks -Tom
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