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HOMESERVICE MANUALSKIA2015FORTE EXREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM DIAGNOSIS (1 OF 2) - 2.0LDTC P0304: CYLINDER 4-MISFIRE DETECTEDDTC INFORMATIONDTC DETECTING CONDITION
2015 Kia Forte EX

DTC Information: DTC Detecting Condition

2015 Kia Forte EXSECTION DTC Detecting Condition
Item Detecting Condition Possible Cause
DTC Strategy
  • CKPS signal check in Engine roughness through condition
  1. Poor connection
  2. Ignition system
  3. Fuel system
  4. Intake/exhaust air system
  5. Ignition timing
  6. Injector
Enable Conditions Case 1
  • 510 RPM < Engine speed < 6500 RPM
  • Engine load > Zero torque line
  • Time after engine start > 0 sec.
  • ECT at start > -10°C
  • No rough road detection
Case 2
  • 510 RPM < Engine speed < 6500 RPM
  • Engine load > Zero torque line
  • Time after engine start > 0 sec.
  • ECT at start > -10°C
Threshold Value Case 1
  • Misfire rate for E/M threshold > 3.0%
Case 2
  • Misfire rate for catalyst damage > 6 ~ 20%
Diagnosis Time
  • -
MIL ON Condition Case 1
  • 2 trips
Case 2
  • 1 trip (Blink)
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

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.