What model ECM is this ?

[Chipsbyal at aol.com]

John, I've had trouble communicating with Vette ECM's in a stand alone 
harness. Using a TECH1 is of no help either. The only way I've been able to 
get data is to "tell" the Diacom or other scan tool that the vehicle is a 
Camaro or Firebird. If there is going to be any talking this always worked. 
There still is the possibility that the ZR1 has a different data stream and 
may still need the CCM or BCM.
Good luck, AL