Hyundai Repair Questions? Ask a Mechanic for Answers ASAP
Nowadays, a scan tool that can read and display sensor data and a scope to confirm the signals are essential tools needed to accurately and efficiently diagnose these computerized systems.
In this particular case, code P0717 tells us that an output pulse signal was not detected from the input speed sensor when the vehicle was going faster than 30 KPH, which prompted the onboard computer (PCM) to put the system in FAIL-SAFE mode.
99% of the times, this type of fault is caused not by bad sensors, but instead by bad connections or wiring preventing the signals from getting to the PCM. I can upload the diagnostic procedures for the three circuits involved, Ground, Power and Signal; would that help you?