What do you mean by reset the ECU if you don't mean clearing codes?
Generally you'll need something more specialised than an ELM interface for things like that, I had an issue on my VTS that required the PSA specific 'lexia' interface to reset it and get the car going - clearing faults with the ELM OBD interface didn't cut it.
I had a prog on my Laptop I used on my Legacy that would actually reset the ECU. If there has been a problem for a bit on the car then the ECU would be trying to compensate for said problem. Once the problem is repaired the ECU is reset to allow it to learn how to run the car with everything tip top
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