Hyundai Elantra MD/UD: Input Speed 
Sensor. Troubleshooting - Automatic Transaxle Control System - Automatic Transaxle System - Hyundai Elantra MD 2010-2015 Service manualHyundai Elantra MD/UD: Input Speed Sensor. Troubleshooting

Signal Waveform

Fig 1) Input/Output speed sensor at low speed
Fig 2) Input/Output speed sensor at high speed