Relationship between DTC and Driving Pattern in EOBD System

Courtesy of HYUNDAI MOTOR AMERICA

1. When the same malfunction is detected and maintained during two sequential driving cycles, the MIL will automatically illuminate.
2. The MIL will go out automatically if no fault is detected after 3 sequential driving cycles.
3. A Diagnostic Trouble Code (DTC) is recorded in ECM memory when a malfunction is detected after two sequential driving cycles. The MIL will illuminate when the malfunction is detected on the second driving cycle. If a misfire is detected, a DTC will be recorded, and the MIL will illuminate, immediately after a fault is first detected.
4. A Diagnostic Trouble Code (DTC) will be automatically erased from ECM memory if the same malfunction is not detected for 40 driving cycles.
   NOTE:

   • A "warm-up cycle" means sufficient vehicle operation such that the coolant temperature rises by at least 4°C (40°F) from engine starting and reaches a minimum temperature of 71°C (160°F).
   • A "driving cycle" consists of engine startup, and vehicle operation beyond the beginning of closed loop operation.