I have these PCM's and I have no idea what year they are

PCM # 1......

http://img78.photobucket.com/albums/...ist/PCM_1b.jpg


PCM # 2.....

http://img78.photobucket.com/albums/...ist/PCM_2b.jpg


Very high res versions

PCM # 1......

http://img78.photobucket.com/albums/...ist/PCM_1a.jpg


PCM # 2.....

http://img78.photobucket.com/albums/...ist/PCM_2a.jpg


BTW were there any differences in the Corvette, F-body or Impala/Caprice PCM's?

 

Those pictures aren't very good for identifying the PCMs, but from what I can tell, PCM#1 is an OBD2 and PCM#2 is an OBD1. (judging by the cable that connects the two halves)

To be 100% sure, the PCM that has AN28F512 written on both Intel chips is the OBD1. The one that has AN28F512 just on one of the chips is the OBD2. (I could see the writing just on one of the chips in both pictures)

In 96, the only difference between Corvette, Impala, Caprice, Roadmaster, Fleetwood and Camaro/Firebird PCMs were the knock modules. They are completely interchangeable provided they are reflashed for the right vehicle.

In 94/95, some Corvette PCMs were slightly different, however they could still be reflashed to work in the other vehicles. Everything else was the same (except for knock modules) and you could use it in any of the above vehicles if you flashed them accordingly.

 

Need to bring this one TO THE TOP.

So you guys are telling me that there is a physical difference between OBDI & OBDII PCM's????

Judging by what is said above, can I just pop them open and check them out???

Can you just do a reprogram via TunerCat and change a OBDI into an OBDII???

Thanks guys.

 

Click for HI-RES. Is this an OBD1 or OBD2 PCM??

 

Thinking about that, you would need the matched OBD version of Tunercat to communicate with the PCM. If you were able to communicate with it, you would then need the other OBD version software to reflash it to a different type OBD. The other version software that you want to convert it to is not going to communicate with the current version. So, how could you ever convert it?

 

Hmmmm... didn't even think about that.

So you're saying that the version of TC that I'm using now on my '95 motor ONLY works with '94 & '95 (AKA OBD1)???? I guess I never realized that. I thought it had the option of all the years, body styles, tranny's, etc...???

 

PS - I'm not near my laptop with TC so I can't just fire it up...

 

That's correct, TC, Datamaster, LT1Edit are only good for OBD1. Basically everything I gave you on the CD is for OBD1 only.

I figured out what you're asking, and I really don't think there is a logical way of converting a PCM from OBD1 to OBD2 unless you really got into it and hacked the programming in the chips or soldered connections on the board.

OBD2 has crank position sensor, 2 more oxygen sensors, a extra knock sensor.. and probably something else that I'm missing than an OBD1 ecm, so right there you're out some connections..

 

Which brings me full-circle back to my original question.

How can I identify this above PCM as an OBD1 or OBD2? Is there an extra resistor? A MISSING resistor????

 

Look at the FLASH chips. If each side has a AN28F512 chip, then its OBD1. If only one side has AN28F512 and the other FLASH chip is different, it's OBD2.

You can convert a OBD1 vehicle to OBD2 and the reverse, you just have to make a few modifications to do so. I've never personally done either, but I'm certain Madwolf or another person on here can tell you the steps if that's what you are trying to do.

 

Could you, by chance, click on the pics above and "point out" these flash chips?? Sorry I'm micro-illiterate...

 

He typed FLASH in caps to tell you that's the manufacturer. Both the chips are Flash AN28F512s. Look on the board for the chips that have FLASH printed on them, then look @ the part number in the middle.

In reference to your pics post, pics #1 & 2=the Flash chip is in the upper left hand corner, #3=top middle, #4=right middle.

 

Gotcha. So this is definitely an OBD1 PCM.

Thanks guys.