V6 Vortec to V8 Vortec Conversion

[Len Sabatine]

     SAE J1850  [ GM VPW ].  No BLM or INT. Now, Long - Short Term Fuel Trim.
     LT Fuel , ST Fuel.     There's  Engine Data List [s] 1 and 2.
     HO2s are arranged as Bank 1 - 2 , Sensor 1 and Sensor 2 on each Bank. 
V6- 8.
     [ Pre and Post Cat Monitoring . Sensor #2 is monitoring Cat Oxygen content
     Ratio].   You see a minimum of 4 HO2s. on the Data Screen.

     OBD2 is very different than OBD1. If you don't understand OBD1 , OBD2
     will be more difficult . The Data Stream , Dual 10.4 - 41.6 Kbs baud 
rates ,
     and Communication interface to PC  have no likeness to 8192 Uart in 
OBD1 GMs.

     Scan Tools use the 10.4 Kbs Mode.     Programming is 41.6 Kbs  Block 
mode,
     Security and PCM Unlock is  Totally Different than OBD1  Commands and 
Requests.
     The Chip on Most Scan Tools is not capable of the Programming Mode. 
Nor is code present
     to accomplish the task. If 1 PCM family is opened , The Keys to the 
castle may still Not
     be in hand. Sort of like throwing a baseball at a train car that's 
moving @ 100 Mph,
     expecting it to hit the target inside an open window , if it's even open.

     There is NO SAE Documentation about Down - Up Load of firmware , since 
it's termed
     as Manufacturer Specific Code. Shelling out $100 for SAE HS3000 
Manual  provides
     No information to help would be programmers. Great Manual to help 
build scan tools tho.
     Hopefully ,  this information may save some folks from chasing their 
tails , while working
     with OBD2 PCMs.
     Len

>I downloaded the demo but really don't know what I'm looking at...has anyone
>tried this? What do you think?  I didn't notice anything showing BLM's or 
>INT...
>
>Gary
>gary.heuston at afwa.af.mil
>
>
>"Gregory A. Parmer" wrote:
>
> > > They are making a MINT off this stuff too...$550 for LT1 Edit for OBDII.
> > > Makes you want to develop a freeware OBDII editor just to knock em out of
> > > business...
> >
> > Didn't you guys leave out http://www.obd-2.com ?  I like Alex's scanner.
> > IIRC, Circuit Cellar Mag also did a piece on building your own similar
> > system. If I understand what I've read about OBDII correctly,
> > re-programming is accomplished in *much* the same manner as reading data.
> >
> > $0.02,
> > -greg
> >
> > 
> ----------------------------------------------------------------------------
> > To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> > in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>
>----------------------------------------------------------------------------
>To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
>in the body of a message (not the subject) to majordomo at lists.diy-efi.org

----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org