DTC P0304 Cylinder 4-Misfire Detected: DTC Detecting Condition

DTC DETECTION CONDITION REFERENCE CHART

Item		Detecting Condition	Possible Cause
DTC Strategy		Calculation of engine roughness	Faulty spark plugs, high-tension lead, or Ignition coil Incorrect valve timing Uneven compression Air leakage Improper Fuel pressure or dirty fuel Blocked/Leaking injectors Leakage between cooling system and cylinder Enable Conditions
Enable Condition		170 < Mass air flow above zero load curve (mg/rev.) < 460 512 < Engine speed(RPM) < 6500 40 < Mass air flow gradient(mg/rev.) < 400 140 < TPS gradient(°) < 200 Engine Coolant temperature > 20°C (68°F) if Start temp. < -7°C (19.4°F) No failure on CAMS and CKPS No rough road Fuel cut off not active Battery voltage > 11V
Case 1)	Threshold Value	Misfire = 12~50% within 200 rev.
	Diagnosis Time	200 rev. or 3*200 rev.
	Mil On Condition	Immediate
Case 2)	Threshold Value	Misfire > 2% within 1000 revolutions for SULEV Misfire > 1.3% within 1000 revolutions for ULEV
	Diagnosis Time	1000 rev. or 4*1000 rev.
	Mil On Condition	2 Driving Cycles