Quote:
Originally Posted by Sensible_
Whilst running diagnostics with ISTA-D, was your vehicle connected to a power supply? (Not battery charger). If so was the supply in BMW's recommended list?
If the answer is no then unfortunately the user has to take responsibility.
If the answer is yes then I'll agree with you.
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I was on battery only during the diagnostic session. But remember, I didn't do coding or flashing. If I do flashing/coding I always have a 45A power supply (not charger) connected.
As well as during normal operation, ECUs should be robust against undervoltage conditions during diagnostic sessions. There's nothing magical about it. Just some more diagnostic messages on the bus.
I work for an automotive supplier and we run our ECUs through crank profiles during validation while constantly reading DTCs. Those profiles drop down to 9V for short periods of time.