On the output of the transmission.
If the VSS is defective replace the instrument cluster. Only on 2001 and later Elantra's have speed sensor on transaxle
The VSS sensor is located on the transaxle
The VSS:Vehicle Speed Sensor is located on the transaxle
The vehicle speed sensor which is an integral part of the speedometer
The Idle Speed Control actuator is located right behind the air intake plenum
my book reads p1519 (manufacturer specific) idle air control system performance p0715 input/turbine speed sensor A circuit malfunction
Vehicle speed sensor
I believe it is a input speed sensor. Hyundai calls them pulse generators on the 99 elantra.
The speed sensor is a timy magnetic reed switch located inside the speedometer cluster in the dash. The reed switch is magnetically triggered by a magnet that spins in the speedometer cable.
If the VSS is defective replace the instrument cluster.
there are two a turbine speed sensor and an output speed sensor both are located above the valve body.
If the VSS is defective replace the instrument cluster.