trifecta engine failsafe, no idea why

[sandbagger]

no wheel speed sensor codes
no mixture codes and all looks good live, so I doubt its a vacuum leak either
Mass Air data looks good live, and for amusment, disconecting the MAF instantly puts it into trans failsafe and sets the code for MAF

when I first cleaned the ICV before reinstalling it I plugged it in and it did energize and looked to open the valve aprox 50%
Also when I do a cold start(its 35F outside now) it brings the idle up to about 1100 for a bit, then brings it down to 800 so it is working.
once the codes all hit, it wont idle after that

I see some posts about that 55C4 code and people replacing yaw sensors, I checked the data on it in park, wasnt zero, but about 0.3-0.4 and 0.1 and would move when I shook the vehicle

Originally Posted by 80stech

Anything like the throttle valve, gas peddle position, vacuum leak (would probably set a mixture code) or even(less likely) MAF sensor not working correctly could in theory fool the DME into thinking the ICV is sticking.
Is there a wheel sensor code ?? You could easily have a bad wheel sensor that you can't see a problem with in the live data.
I would check the wiring and voltages at the ICV.