self-diagnose

verb2

1. •
   To attempt to identify a medical condition in oneself without consulting a medical practitioner.

   • Ignorant about vomiting before the incident, I was now terrified of it. I self-diagnosed myself with emetophobia – fear of vomiting. — 2011
2. •
   Of a system, to identify problems within itself.

   • 70% of all software failures can be self diagnosed and repaired automatically when connected to the company's diagnostic web-site. — 2012