problems with Diacom and LT1

[Shannen Durphey]

L and M are serial data.
Shannen

NickG wrote:
> 
> 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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