Applicable to various user roles including OEM R&D engineers, after-sales experts, repair technicians, online customer service, and vehicle owners, supporting topic analysis and data maintenance through system process tools. Diagnostic experience from experts is accumulated and stored via the knowledge mid-platform to assist repair technicians in rapid learning and growth. The diagnostic process is guided by system-led operations. After early vehicle warning, online service agents proactively contact vehicle owners to provide services, and vehicle owners can also consult electronic manuals for self-troubleshooting.