Diagnosing a Car with No Fault Codes: Define What the Scan Actually Proves
Original STEP worksheet

- Vehicle, configuration and case reference:
- Customer-described symptom:
- Technician-observed symptom:
- Scan date and tool/software identification:
- Systems queried and systems that communicated:
- Exact reported code status and saved report:
- Relevant readiness or other status information:
- Missing coverage or communication:
- Applicable symptom procedure:
- Next diagnostic question and planned test:
- Result, evidence reference and remaining uncertainty: