Quote:
Originally Posted by Kodename47
If I'm honest, the only thing I have found to cause issues mid flash is plugging something into the power sockets/cigarette lighter.
I can confirm, on the push button models, that so long as the key is present to allow you to cycle the modes you can do what you want with the key once the ignition is on. I have walked away with it in my pocket while the laptop is in the car without a problem. The ECU does not require it's presence when on, just as it can run without the key in the car.
Opening and closing doors also doesn't seem to be an issue, but is definitely worth avoiding.
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I added some more words at the bottom.
you are correct in that in most cases you will get away with many of the things i have listed. It when the holes in the cheese line up as they say and you get say a battery that a bit ordinary/low coupled with opening doors (remember the window jumpup/down which is a reasonable transient load) and you may trigger suffient voltage transient to cause an issue.
Yep the key fob dont need to be in the car once ignition is on, but many flashing systems require ignition to be cycled as part of overall process. If they keys are not their this will be a problem and likely induce mild panic as they think they have bricked ecu, often resulting in bad decisions like battery removal and cable removal attempted reflashing ect trying to fix a problem , but actually creates one. Hence the leave the keys near the start button recomendation.
And dont put your running laptop on top of keys if you leave them on seat generally car wont start, no signal.
most flash system will refuse to write if volts start to low, but if your right on the edge and then open door it might fail mid flash.
however just this week 2 guys in Oz have bricked ECU using Ecutek due intermittent obd connector on one was cause, the second one cause is unknown but we suspect low battery volts as it was turbo build and likely took a few days. Both had a couple of attempts to resurect the problem and burned 3 more liciences (they will get them back i suspect) but both are sending ECU to Ecutek for bench reflash or resurection.