Playing with the ECM

[Land Shark]

At 22:25 12/14/95 -0500, you wrote:

>GM will be designing their new vcm (vehicle control module) with anti-tampering
>software.  There are three levels of information available on the new vcm:
>        1) general engine diagnostics (freely available to scan tools)
>        2) dealership functions (like clearing the trouble codes)
>        3) emissions functions ( fuel maps, shift maps, ignition timing)

 This is already in effect in any brain that is OBD-II compliant to some degree

 (flash eeprom, security codes to reprogram, etc)

 Even the OBD-I (or is it just OBD) had SOME anti-tamper functions, like multiple
 checksums, and max revs stored elsewhere in the vehicle (instrument cluster!)

>As you can guess, level two will be only available to authorized service
>personnel.  Level three will be protected from modifications from everyone
>except GM.  

 Yeah, and then someone with a little savvy will pull the EEPROMS from a fully functional
 brain, dump the code, disassemble it and figure out all the little minefields ... as they
 have with every OEM trick so far .. 

 Currently, I'm working on doing this for the Bosch M5.2 and Siemens MS41.1 controllers
 in the new BMWs (my bag is Bosch Motronic)

 All of their new stuff is EEPROM/Anti-Tamper per OBD-II (yuk!!)

 Jim Conforti