Vehicle cannot go more than 80km/h and p0715 code comes on what is the relation between the two?

Use a scan tool to retrieve the trouble codes from the computer.The code will help lead you to the trouble.

I hope this helps and is what your looking for... good luck

http://www.fordobdcode.com/p0715-ford

Ford P0715 OBD-II Trouble Code Definition:
P0715 Input Shaft Speed Sensor Circuit Malfunction
P0715 Ford OBD-II Trouble CodeDescription:
OBD Trouble Code P0715 Input/Turbine Speed Sensor "A" Circuit What does the code mean? OBD-ii Code P0715 definition:
The input speed sensor detects the primary pulley revolution speed and sends a signal to the Transmission Control Module (TCM) and Engine Control Module (ECM). Symptoms Sumptoms of OBD code P0715
- Engine Light ON (or Service Engine Soon Warning Light) - Possible shifting problems Causes Causes of the OBD-II code P0715
- Transmission speed sensor circuit is open or shorted. - Poor transmission speed sensor circuit connection - Faulty transmission speed sensor The Error code is generally activated on detection of the following conditions: Diagnostic Trouble Code (DTC) P0715 is detected when TCM or ECM does not receive the proper signal from the sensor. Solutions

Here's the cause for P0700 code.Here's the cause for code P0715,

1. p0715 code (Input/Turbine speed sensor A Circuit malfunction).

They are three separate issues.
Code 431 involves the O2 sensors and the catalytic converter, code 446 is for the evap vent control for the gas tank, and code 715 is for the input shaft speed sensor in the transaxle.
The engine temp and other factors would need to be checked for code 431, and the sensors would need to be tested for the other two codes.

I suspect that your transmission is slipping, you may not feel it yet but the sensors are picking it up in the relative speed signals from the input and output sensor.

The P0715 tells you TCM detected a loss of TSS signal during operation. Insufficient input from the turbine shaft speed sensor.

P0715 Input/Turbine Speed Sensor Circuit (transmission related)
P0115 Engine Coolant Temperature Circuit (fuel/air mixture related)
P1191 is a manufacturer-specific code related to fuel/air mixtures, as is P1193 - those will have to come from Hyundai.

Yes they are related once the input sensor fails its activates the signal TCI ML in the computer codes apper .........

p0715 > A/T input speed sensor circuit 1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage. 2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. P1729>This DTC code is related to the EMC and is set If EMS harness has an open battery source 1. Ignition OFF 2. M54 Electric Magnet Valve Clutch connector : Disconnect. 3. Measure resistance between 1 & 2. A. Specification : Approx. 1.8 ~ 2.2 Ω The above value is only for reference. The data from vehicle may differ from it according as various vehicle condition. This inspection is for checking open or short of EMC coil.