Theory and operation
Charge inlet → onboard charger → traction battery → inverter → motor describes AC charging and propulsion; DC fast charging normally bypasses the onboard charger.
EV Foundations / Diagnostic guide
EV ARCHITECTURE & POWER FLOW.
Trace energy from the charging source through storage, conversion, propulsion and low-voltage support.
EV GUIDE01/24
Use this guide to organize evidence. Vehicle-specific high-voltage access, measurements and component isolation require OEM procedures, appropriate qualifications, rated PPE and approved test equipment.
GUIDE PURPOSE
Diagnose the system—not one isolated value.
Confirm vehicle state, operating conditions and the full DTC record before clearing evidence or opening the high-voltage system.
Diagnostic evidence
Map pack contactors, service disconnect, DC link, DC-to-DC converter and each thermal loop before interpreting a DTC.
Safe diagnostic path
Use the OEM block diagram and topology scan to identify which controller owns each permission, measurement and contactor command.
Boundary and common error
Do not assume orange-cable routing, disconnect location or capacitor-discharge method from a generic diagram.
Specifications, connector access, disable sequences, wait times and allowable tests vary by model and voltage architecture.