EVM https://validator.w3.org/feed/docs/rss2.html Home x OBC Systems In the diagnostic workflow, what should you do before concluding the OBC itself has failed internally? What is a key factor that favors OBC replacement over repair? What is a likely cause of charging starting and then stopping intermittently? A vehicle can DC fast charge normally but cannot AC charge at all. What does this suggest? Why is electrical isolation important in the OBC’s DC-DC conversion stage? What is the role of the PFC (Power Factor Correction) stage in an OBC? Why does DC fast charging bypass the OBC? What does the OBC actually do? What the OBC Does EV Basics 101 OBC Components & Circuit Overview Common OBC Failure Symptoms Diagnosing OBC Faults with Scan Tools OBC Repair vs. Replacement – Decision Criteria Case Study – OBC Failure Diagnosis Walkthrough Battery Systems Before touching any high-voltage component during pack service, what must you always do first? What should you do if you suspect thermal runaway is occurring in a vehicle? What is the difference between passive and active cell balancing? What is the recommended first step in the battery diagnostic workflow? What does an isolation/insulation fault indicate? A customer says their range dropped in cold weather but their battery is otherwise healthy. This is most likely related to: What does State of Health (SoH) represent? What communication protocol does the BMS typically use to report data to the vehicle? What is the primary role of the BMS? In a “96s2p” configuration, what does “s” refer to? What is the smallest individual unit in a battery pack’s structure? Which battery chemistry is known for higher thermal stability but lower energy density? EV Fundamentals Hands-On – Pack Disassembly Walkthrough Battery Safety – Thermal Runaway & Disconnection Procedures Cell Balancing & Module-Level Repair Battery Diagnostics – Tools & Procedures Common Battery Faults & Failure Modes State of Charge (SoC) vs State of Health (SoH) Battery Management System (BMS) – Role & Communication Battery Pack Structure – Cells, Modules, Pack Battery Chemistry Basics Role of contactors? HV cable color on schematics? Voltage architecture for E-GMP ~18 min fast charge? BYD Blade Battery chemistry? Nissan Leaf DC fast-charge connector? Can an HEV be plugged in? What distinguishes PHEV from BEV? Most common modern EV motor type? What does the BMS monitor/control?