I did some additional checking and yep, OBD-II does monitor to the IAC. From the 1998 shop manual:

Diagnostic trouble code P0506, defined as "Idle control system RPM lower than expected". And one of the causes of this code to be set is high resistance from the IAC to the ECM. Which is what you will get if you disconnect the electrical connector.

But it does give the nominal resistance of the IAC assembly. Between pins 1 and 2 should be 14-18 ohms. Between pins 2 and 3 should also be 14-18 ohms.

So...is there a way around this with OBD-II? There might be. If you can take the IAC apart it might be possible to separate the IAC motor from the pintle. It seems that this can be done with the older IAC but I don't know about the newer one. If you separate the pintle from the motor then the pintle will remain fixed, as will happen when you pull the electrical connector. But...with this method the pintle doesn't physically move but the ECM gets data from the IAC saying that it DID move. The perfect fake out. <img src="/forums/images/graemlins/lol.gif" alt="" />

1998 Sportage - Gone.
2004 Honda Civic Coupe.
2007 Suzuki Grand Vitara - She got it.