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Fault Code Clear Switch - how long should it be active to clear codes


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How long should the Fault Code Clear Switch be active for it to clear the check engine light?

I have tried up to 500 ms and it does not always work, but it would be nice to have a definitive answer on this. I'm using a CAN DI as the input.


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I get quite variable results also.  I had a range between 0.1 and 0.8s with a quick test I done.   I suspect it is only being run in a slow loop so it wont be "seen" until the next loop comes around and assesses the switch state.  I will get @Vaughan to confirm when he's back from holiday.  

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