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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 P0304: Cylinder 4-Misfire Detected >> System Inspection >> Visual Inspection

Visual Inspection

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  1. Visually/physically inspect for the following conditions.
    • Vacuum hoses in engine room for splits, kinks and improper installation.
    • Positive crankcase ventilation valve for improper installation, damaged o-rings and malfunctioning.
    • Verify that the PCM ground connections are clean and properly tightened.
  2. Check MAFS and ECTS for the following conditions:
    • Contamination, deterioration, poor connection or damaged harness.
    • The MAF signal displayed on the GDS should increase as engine speed increases.
    • The engine coolant temperature displayed on the GDS should close to the actual coolant temperature.
  3. Was a problem found in any of the above areas?

    YES 

    NO 

    • Go to next step as below.