WinQCad vs. EagleCAD

[krw]

Yup. That's how it should be done. Anything else opens the big barn door
to fraud, deception and cheating by "We'll make any car pass" sort of shops.




They do connect to the jack under the dash.

Checking for fault codes, I would assume. If the ECU has detected
misfiring or occasional over-rich operation, I imagine that the car
won't pass the inspection, and that a repair and re-test will be
ordered.

I don't think that they *trust* the ECU to report any and all possible
problems... which, as you say, it how it should be.[/QUOTE]

Actually, they (they == several states) do. They query the ECU to see
that all devices are working properly, which presumes the ECU hasn't
been tampered with. Since '96 (could be '97) model years the ECU
interface and reporting has been standardized. All pollution devices
must report through the under-dash plug.