CAN 통신 완전 정복: 120옴의 역설과 마법의 '모듈 분리 진단법',

CAN communication failures are the most frequent yet perplexing issues in the field! Are you wasting time dismantling the wiring? In this video, we provide an in-depth analysis ranging from the principles of 'impedance matching (60 ohms),' the core of the CAN communication physical layer, to the fault tracing techniques that baffle mechanics. In particular, we demonstrate the paradoxical phenomenon where communication between controllers is maintained even in a 120-ohm state with a single missing termination resistor, using a real-vehicle demonstration where we unplug the ECU connector from a perfectly functioning car. Furthermore, we generously share the know-how of the **'Split-Half Method'**, which leverages this phenomenon to revive the entire network by forcibly removing only the suspected module in a situation where communication is completely paralyzed. If you are a practitioner looking to maximize maintenance efficiency and elevate your diagnostic capabilities to the next level, please watch until the end! ⏱️ Timeline 00:00 Opening: The Biggest Challenge in Vehicle Diagnostics, CAN Communication Failure 01:30 Chapter 1: The Secret of 60 Ohms - Why Are Two Termination Resistors Necessary? (Visualization of Signal Reflection Suppression and RC High-Speed ​​Discharge Principles) , , 05:00 Chapter 2: Breaking Conventional Wisdom (Actual Vehicle Demonstration) - Let's Boldly Pull Out the ECU Connector on a Running Car! Proving the '120-Ohm Single-Ended Communication Paradox' , , 08:45 Chapter 3: Miracle Fault Tracking - Application Scenario of the Magical 'Module Separation Method' to Restore Communication When the Entire CAN Bus Shuts Down , 12:20 Advanced Diagnostic Tip: It's 60 Ohms Cold, but Communication Cuts Off While Driving? 'Thermal Strain Breakdown' Missed by Multimeters and Oscilloscope Waveform Analysis 14:00 Summary and Wrap-up: The True Physical Significance and Warnings of 60-Ohm and 120-Ohm