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with my Innova 3140 OBD 1 & 2. I can retrieve codes using a jumper, but the scanner won't communicate. Any ideas what would cause that? 1987 Blazer 350 TBI
I'm not familar with Inova? But if it is also a cable to laptop like WinALDL it could be the cable installation USB/Com port issue. If not look at Pin E on ALDL port is connected, I've seen them pushed out...