Theory and operation
Clearing DTCs is not verification; the repair must survive wake, READY, propulsion, shutdown, sleep and charging transitions.
EV Foundations / Diagnostic guide
EV POST-REPAIR VERIFICATION.
Prove READY operation, charging, thermal control and network integrity before returning the vehicle.
EV GUIDE04/24
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
Record isolation status, contactor feedback, DC-to-DC voltage, charge power, thermal requests, remaining DTCs and readiness limitations.
Safe diagnostic path
Repeat the original failure conditions safely, run the OEM post-repair routines, rescan every module and document changed learned values.
Boundary and common error
Stop if isolation, thermal distress, unexpected contactor state or a safety-system DTC returns.
Specifications, connector access, disable sequences, wait times and allowable tests vary by model and voltage architecture.