I'm not sure what you're asking.  

Are you asking how to read the codes?  There's a connector under the left
side of the dash which should fit your scanner connector precisely.

Are you asking what a particular code means?  If so, I'll need to know the
code.

Are you asking the definition of all the codes?  Your scanner should have
come with some information (either printed or stored in memory in the
scanner) which says what the codes mean.  If you have a code for which you
can't figure its meaning, by all means ask here.  I'll do my best to
explain it.

give me sometime and I well find you all the codes on your 2000 Elantra it
may be a long list
but I well get it for you.

Hi I just find a web site that is call www.automotivehelper.com for your
obdll codes at
the top of the page it say please visit obdll codes hope this helps you
please let me know if
I can help some more.
thanks
loyalspirit