Description
In this video, we dive deep into a 2021 Hyundai Elantra with a dead tachometer and a Christmas tree of warning lights (ABS, Forward Collision, Traction Control, Stuck in park). While most would pull the trigger on random parts, we use an Oscilloscope to prove the problem is in the wiring.
We identify the "Shark Fin" waveform—a textbook signature of high resistance—and trace it back along with a OEM meter and wiring schematics