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.
DTC P044A: Refer to
DTC Description
.
DTC P044E: Refer to
DTC Description
.
.
2.
CHECK EGR VOLUME CONTROL VALVE
Check the EGR volume control valve. Refer to Component Inspection
Component Inspection (EGR Volume Control Valve)
.
Is the inspection result normal?
Check intermittent incident. Refer to Intermittent Incident
Intermittent Incident
.
Replace EGR volume control valve. Refer to
Removal and Installation
.
![[Previous]](../../../buttons/fprev.png)
![[Next]](../../../buttons/fnext.png)
Perform diagnosis of applicable. 
..
..Check intermittent incident. Refer to Intermittent IncidentIntermittent Incident.Replace EGR volume control valve. Refer to Removal and Installation.