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Home >> Hyundai >> 2021 >> Ioniq Plug-In Hybrid SEL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (PHEV) (2 Of 3) >> DTC P0300: Random/Multiple Cylinder Misfire Detected >> DTC Information >> DTC Detecting Condition

DTC Information: DTC Detecting Condition

Item Detecting Condition Possible Cause
DTC Strategy
  • Engine roughness through crankshaft speed fluctuation
  1. Poor connection
  2. Ignition system
  3. Fuel system
  4. Intake/exhaust air system
  5. Ignition timing
  6. Injector
Enable Conditions
  • Engine speed is higher than 510 rpm and lower than 6500 rpm
  • Engine load is higher than Zero torque line
  • Coolant temperature is higher than 18.5°F (-7.5°C).
  • Fuel Level is greater than 15%
Threshold Value Case1
  • Misfire rate is greater than 5.58% pre 1000 revolutions
Case2
  • Rate of misfire per 200 revolutions is greater than 6.42 ~ 47.4% in driving condition
Diagnostic Time
  • Threshold Value reference
Mil On Condition
  • 2 driving cycle