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Home >> Hyundai >> 2004 >> XG350 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (2 Of 2) >> Trouble Shooting For DTC >> DTC P0401: Exhaust Gas RECIRCULATION Flow Insufficient Detected >> Inspection/Repair >> Component Inspection

Component Inspection

  1. Check EGR S/V.
    1. Ignition "OFF".
    2. Detach EGR valve.
    3. Check EGR valve for sticking or carbon deposit.
    4. Apply a vacuum to EGR S/V and check that vacuum is kept hold.
    5. Blow air on one side of EGR valve and check that air is not passed through (when a vacuum is not applied).
    6. Blow air on one side of EGR valve and check that air is passed through (when the vacuum which operate EGR applied).
    7. Attach EGR valve with using a new gasket.
    8. Perform EGR actuation Test with Scantool.
      Fig 1: Display EGR Actuation Test
      G07374588
    9. Is the EGR valve working properly?

      YES

      • Substitute with a known - good PCM and check for proper operation.

        If the problem is corrected, replace PCM and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

      NO

      • Substitute with a known - good EGR Valve and check for proper operation.

        If the problem is corrected, replace EGR Valve and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

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