Ok' I tried ISO9141 and ISO14230 and tried with an address from 0x01 to 0x7F without success.
It seems my car (Elantra 2007) is CAN only
CAN is also used for the electric power steering, etc.
And there is no VSS on my car anyway so I can not use the MPGuino!
There is only a WSS, a right front wheel speed sensor.
I may let the ISO OBDuino in the hand of someone else and start again with a AT90CAN or an ELM327