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HOMESERVICE MANUALSKIA2015OPTIMA SX TURBOREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 107 (ENGINE CONTROL SYSTEM DIAGNOSIS (2 OF 3) - 2.4L (EXCEPT HEV))DTC P0300: RANDOM/MULTIPLE CYLINDER MISFIRE DETECTEDDTC INFORMATIONDTC DETECTING CONDITION
2015 Kia Optima SX Turbo

DTC Information: DTC Detecting Condition

2015 Kia Optima SX TurboSECTION DTC Detecting Condition
WARNING: This page is about a different variant/trim than selected.
DTC DETECTING CONDITION

Item Detecting Condition Possible Cause
DTC Strategy
  • Calculation of engine roughness
  1. Faulty spark plugs or Ignition coil
  2. Incorrect valve timing
  3. Uneven compression
  4. Air leakage
  5. Improper Fuel pressure or dirty fuel.
  6. Blocked/Leaking injectors
  7. Leakage between cooling system and cylinder
Enable Conditions
  • Engine load ratio :14~64%
  • 500< Engine speed (RPM) <6700
  • Mass air flow gradient/sec. :12~60%
  • Throttle gradient/sec. : 0.5~10.5%
  • Coolant temperature >20°C (68°F) if start temp. <-7°C (19°F)
  • No relevant failure
  • Fuel cut-off not active
  • 11V< Battery voltage <16V
Threshold Value
  • Misfire detected on 2 or more cylinders
Diagnostic Time
  • Continuous
Mil On Condition
  • Immediate (Misfire enough to damage the catalyst)
  • 2 Driving Cycles (Misfire breaking the emission regulation)
RENDER: 1.0x

NO RELATED

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.