Quote:
Originally Posted by renault_megane_dci
From what I red here and there, you want to kill the engine with the ECU still working and that means it is not the same as turning the key (or hitting the OFF switch).
As it is not hat common a car for ecomodding, you are in un-charted territory :/
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From my (possibly limited) understanding, we are saying the same thing.
Using a kill switch, the car is in the same condition as driving, other than the engine being on. To expand, my Mustang simply in the ON position won't react the same way as it would if I started the engine, and then it died by kill switch.
What reasoning do I have for thinking this? If I turn the key to start, my cruise control is reset to off. On my route, I use CC after getting to speed. (*)I EOC, and come to a stop, bump starting before the complete stop, so my engine is running. I continue on when the light turns, and use CC again by the set button, no activation sequence is needed.
So, say at the (*) point, I EOC, and come to a stop
with the engine off. My key never leaves the ON position, but I turn it over to start it. NOW, when I go to use CC, it needs the activation process, it won't just go. This works the same for traction control, and stability control. Engine off (by kill switch) and a bump start keeps me in the same condition. If that key moves ONE BIT(as in from ON to START), I have to start over. Does that make sense?
In defense of the Mustang, this isn't some grand NASA launch system for CC. There are four buttons, two left, two right. There is ON and OFF on the left, and SOMETHING and SET SPEED on the right. So if I used the key, I would have to hit ON again for it to let me SET it, while a bump start after the kill switch simply let's me hit SET to set the CC.
I don't think the point of the car matters much in regards to how the ECU understands things, or reacts. Be it my Mustang or one of the Insights, going from ON to START only rationally applies to the car stopped to getting ready to drive, while the ECU being in ready to drive mode (engine was cranked and started since last key movement) thinks it is in a driving situation.
The only way I understand to test this is for someone have two cars, one with engine started, then turned off, and then one started and the engine killed by kill switch. Then an F150 drives into each, same speed, and angle. If I had to bet which one would still have safety features, I'd bet the one that still thinks it is driving.