WARNING: This page is about a different car, the 2014 Hyundai Elantra GT and 2013 Hyundai Elantra GT. However, it is still accessible from the selected car via links, so may be relevant.
Connect the GDS on the Data Link Connector (DLC).
Start the engine and measure the output voltage of TPS 1 and 2 at C.T. and W.O.T.