Basic ODB Q's Newbie stuff

[Len Sabatine]

     Yes , we can certainly confuse a Newbie into oblivion with GMs on the 
fly multiple
     feature running change  "standards" as you go approach.  Or the Lack 
of same.
     Yes , there's a 95 S/T Platform that's partly OBD1 and OBD2 and 
Another that's All OBD2.
     There's variations within the GM VPW going forward. OEMs never learned 
the K.I.S.S. RULE.
     It gets more complicated each MY , the locks are harder to pick !
     Oh , How about a 95 "B" Cop Car with a 16 Pin DLC , I plugged into 1 
,  go figure.
     Len

>As always, there are exceptions to every rule.

>The ODBII PCM  is SAE J1850 VPW [ GM]  Starting in 1996 MY and Have Flash
>EEPROM[s] nonremovable. Have 16 Pin SAE J1962 Diagnostic Connector
>
>94-5 MY  ECM's are ODBI with Flash EEproms , also nonremovable
>Flash equipped PCMs require RW operations via serial link and
>equire _ "various"   interface HW and SW _"variations".

>  Darn GM and their tomfoolery!
>
>And hopefully my muddying of the waters will show there's no hard line drawn
>with the "standards" that GM used. ;^)
>
>-Andrew

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