Diagnostic Strategy and DTC Logic

🧠 Part of the TuningBot ECU Knowledge Base — in-depth documentation on ECU logic, maps, emissions systems and safe calibration methods.

Modern ECUs implement sophisticated diagnostic strategies to identify faults and meet OBD requirements.

Diagnostic Flow

Fault Detection → Debounce → Maturation → DTC Storage → MIL

Debounce Logic

  • Time-based — fault must persist X seconds
  • Counter-based — must occur X times
  • Drive-cycle — must appear in multiple drives

DTC Status

  • Confirmed — mature fault, MIL on
  • Pending — detected but not confirmed
  • History — previously active

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