68HC11 based PCMs

[Tom H]

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

[kur4o]

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.

[1project2many]

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.

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.

[Tom H]

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

[digimaster]

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

what kind of reader are you using, do you read on bench (upa xhorse...etc) or you use an interface direct to the ALDL?

[Tom H]

what kind of reader are you using, do you read on bench (upa xhorse...etc) or you use an interface direct to the ALDL?

I have been using hardware and software of my own design for PCM access both through ALDL and OBDII. So far all this is done using a bench setup.
-Tom

[titanium]

I have been using hardware and software of my own design for PCM access both through ALDL and OBDII. So far all this is done using a bench setup.
-Tom

can you steer me on the right direction? I just need a hint to how read and write the eeprom