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Diagnosis Procedure
1.CHECK DTC PRIORITY
If DTC P0404 is displayed with DTC P044A or P044E, first perform trouble diagnosis for DTC P044A or P044E.
Is applicable DTC detected?
Perform diagnosis of applicable.
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2.CHECK EGR VOLUME CONTROL VALVE
Check the EGR volume control valve. Refer to Component InspectionComponent Inspection (EGR Volume Control Valve).
Is the inspection result normal?
Check intermittent incident. Refer to Intermittent IncidentIntermittent Incident.
Replace EGR volume control valve. Refer to Removal and Installation.