Basic ODB Q's Newbie stuff

[Len Sabatine]

>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 require
     various interface HW and SW variations.

   94 MY has 12 Pin Diagnostic Connector - 95 MY has 16 Pin Connector [ OBD1 ].
>  Earlier OBD1 ECMs have UV eracable Eprom - calpack unit which is socketed.

>ECM = Electronic Control Module
>PCM = Powertrain Control Module  True
>CCM = Central Control Module  True in Y Platform.[ Corvette ].
>BCM = Body Control Module
>Hope this clears the picture for you.
>
>
>_________________________________________________________________

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