Quote:
Originally Posted by Ecky
I have the diagrams, and there are several very promising candidates but they have arcane names like HTRS, FANC, RLYCTRL, ENGRDY, AC ON and SG2. I did some testing a few years back and found that if I unplugged the wires from the climate control module, I didn't get auto-stop anymore. This suggests to me that there's a signal it sends to the ECU that says basically "ready for auto-stop", and if I cut that one I won't get any more auto-stop under any circumstances. My bet is on it being "ENGRDY".
I get lean burn when it's subzero outside. 
The only factor that absolutely stops it seems to be that the engine is warmed up. |
My guess would be whatever wire gets a different signal when you push the "AUTO" button vs "ECON" would be the fastest way to test this.