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Home >> Hyundai >> 2021 >> Veloster 2.0, Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis - 2.0L (2 Of 3) >> DTC P0300-00: Random/Multiple Cylinder Misfire Detected >> Component Inspection >> System Inspection >> Visual Inspection

Visual Inspection

  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 below.
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