Reversing the '8625

[ShannenDurphey]

Well, the calibration letters/numbers match up to what I have.  But with
BBNT on the ECM sticker, there is no doubt in my mind that the chip/pcm
are a factory original combo.  It's very possible that the dealer's
parts listing shows the same replacement pcm for both numbers.  The way
they change #'s is incredible.  

I have a pcm from a 93? pickup, 350/4l80e.  I'll have to check the BCC
in that against my references.  BTW, how did you read the eprom?

Shannen

Mike Pitts wrote:
> 
> Okay, pulled the PCM again <phew>.  These trucks are
> somewhat rare, compared to the Blazers, so it's possible
> they use a different PCM.  This truck is also all-wheel-drive,
> and has the towing package option, so that may have a
> been a factor in PCM choice as well.
> 
> The sticker on the EPROM reads:
> 
> DELCO
> 4892
> 2303
> 
> I thought it had BBNT on the EPROM sticker but it didn't.  It
> *does* have BBNT printed on the outside of the blue mempak
> cover however, in the following format:
> 
>        DELCO
> BBNT     9734
> 
> FWIW: The ESC filter board in the mempak has 1192307.
> 
> The labels on the outside of the PCM read:
> ----------------------------------------------
> SERV. NO. 16168625     BBNT
> {BARCODE}
> *86BBNTK223160167*
> ----------------------------------------------
> 16179571               BBNT
> {BARCODE}
> *86BBNTK223160167*
> ----------------------------------------------
> 
> The PCM is the usual size with one red and one blue
> connector on the end.  Both connectors have 2 rows of
> 16 pins each.
> 
> I *highly* doubt the PCM has been replaced at any time.
> I have all the service records (even the oil change receipts).
> And there is no sign that it was ever removed before I
> got my grubby little hands on it.  :)
> 
> Looking in through the access cover, the main board has
> "177A183  P5" etched on it.  Maybe this is a P5 PCM? <jk>
> 
> Regardless of whether it's wierd, it's the one it uses and
> therefore, the one I will be using.  With y'all's help, I've been
> making a fair amount of progress!
> 
> Thanks!
> -Mike
> ==========================================
> Mike Pitts
> Delray Beach, FL
> mpitts at emi.net
> http://www.emi.net/~mpitts/mike.htm
> ==========================================