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Home >> Hyundai >> 2015 >> Sonata Eco >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 125 (Engine Control System Diagnosis (1 Of 2) (HEV)) >> DTC P0301: Cylinder 1-Misfire Detected >> General Information >> DTC Detecting Condition

General Information: DTC Detecting Condition

WARNING: This page is about a different variant/trim than selected.
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 temperature <- 7°C(19°F)
  • No relevant failure
  • Fuel cut-off not active
  • 11V< Battery voltage <16V
Threshold Value Case 1
  • Misfire ratio: 9.1 % - 50 % within 200 rev.
Case 2
  • Misfire ratio: 2.3% within 1, 000 rev.
Diagnosis Time Case 1
  • 200 rev. or 3*200 rev.
Case 2
  • 1000 rev. or 4*1000 rev.
MIL On Condition Case 1
  • Immediate
Case 2
  • 2 Driving Cycles