[deus402]

winaldl doesn't show any data at all, so i disconnected it. with nothing jumpered/plugged in to the ALDL (i.e. just how you would normally drive it) if i unplug the MAF sensor, the SES light does not come on, and after shutting off the car and jumpering the ALDL it still only displays code 12, when it should be throwing code 34 as well... ( MASS AIR FLOW (MAF) CIRCUIT (LOW / NO SIGNAL) )

i almost wish it wasn't throwing code 12 so i would know for sure that it was the ecm or at least the aldl wiring harness...

but like i said, when i unplug the MAF the idle changes...

also, if i enter the "Field Service Mode" (see attached pic) it _will_ start flashing once per second, which allegedly confirms closed loop operation...