problems with Diacom and LT1

[NickG]

Thanks for all the tips everybody. We've been trying to connect to it as a
Vette. The ECM is running BAFN code (at least, that's what the label on the
ECM says, but the prom has been reprogrammed by somebody already). I'll try
connecting to it as an F-body and see if it helps. And yes, we have tried
using the 12volt lighter plug also (which didn't help). Incidentally, I
remember trying to connect to a '92 Vette once with Diacom and it also
wouldn't work. Hmmm.

Does anybody know which pins on the diag connector and ECM harness are
required to communicate. That way, I can verify the diag port is wired up
properly.

Thanks,
Nick

> So I'd agree that a good test is to try and connect with another scantool.
And
> not another laptop running the same software, but something commercial and
> trusted by its owner.  If that test fails, begin with the factory service
manual
> chart for "no aldl data."  You'll end up checking to make sure the serial
data
> wire is connected, isn't shorted to ground or power, that the ecm will go
into
> diagnostics & etc.


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