Nissan Sentra B18 (2020-2025) Service Manual: P0404 Egr Volume Control Valve

Nissan Sentra B18 (2020-2025) Service Manual / Engine / Work Procedure (After Replacing Electric Throttle Control Actuator) / Dtc/circuit Diagnosis / P0404 Egr Volume Control Valve

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P0404	EGR A CONTROL (EGR “A” Control Circuit Range/Performance)	A	Diagnosis condition	—
			Signal (terminal)	EGR volume control valve
			Threshold	ECM detects that the current sent to the EGR volume control valve motor is equal to or more than the threshold value under the condition that the target angle of EGR volume control valve is constant.
			Diagnosis delay time	—
		B	Diagnosis condition	—
			Signal (terminal)	EGR volume control valve
			Threshold	ECM detects that the difference between the target angle of EGR volume control valve and actual valve angle is equal to or more than the threshold value.
			Diagnosis delay time	—

POSSIBLE CAUSE

EGR volume control valve
Foreign matter caught in theEGR volume control valve

FAIL-SAFE

Engine Control System

Engine operating condition in fail-safe mode
Fail safe mode		Nissan Sentra Vehicle behavior
Traveling control mode	Accelerator angle variation control	ECM controls the accelerator pedal depression speed to make it slower than actual speed. This causes a drop in accelerating performance and encourages the driver to repair malfunction. Note: ECM does not control the accelerator pedal releasing speed.
	Engine output control 1	ECM reduces the engine output, according to the rise in engine speed. This reduces the Nissan Sentra vehicle speed to encourage the driver to repair malfunction. Driving at 70 km/h (44 MPH) or more is possible. Note: This value is a reference value converted from engine power to Nissan Sentra vehicle speed. Actual power limitation value differs due to the malfunctioning part and driving condition.
	Engine output control 2	ECM reduces the engine output, according to the rise in engine speed. This reduces the Nissan Sentra vehicle speed to encourage the driver to repair malfunction. Driving at 40 km/h (25 MPH) or more is possible. Note: This value is a reference value converted from engine power to Nissan Sentra vehicle speed. Actual power limitation value differs due to the malfunctioning part and driving condition.
Device fix mode		This mode fixes the electric IVT motor and the EVT control solenoid valve in the reference position. The intake manifold runner control valve motor is turned OFF (intake manifold runner control valve opens).
Combustion control mode	Stratified charge combustion control at starting	No stratified charge combustion at starting (cold start).
	Idle speed control	Stops feedback control of idle speed and controls with specified speed.
	Recovery speed control at decelerating	Stops recovery speed control by the fuel cut at decelerating and controls with specified speed.
	Idle neutral control	Stops idle neutral control.

Idle Start/Stop System

Not applicable

Confirmation Procedure

Confirmation Procedure

CHECK DTC PRIORITY

If DTC P0404 is displayed with DTC P044A or P044E, first perform the confirmation procedure (trouble diagnosis) for DTC P044A or P044E.

Is applicable DTC detected?
YES >>
Perform diagnosis of applicable.
- DTC P044A: Refer to DTC Description.
- DTC P044E: Refer to DTC Description.
NO >>
GO TO 2.
PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

>>
GO TO 3.

PERFORM DTC CONFIRMATION PROCEDURE

Start the engine when the following conditions are met.

Intake air temperature	0°C (32°F) or more
Engine coolant temperature	75°C (167°F) or more

Drive the Nissan Sentra vehicle at 50 km/h (32 MPH) or more for at least 5 seconds.
Check 1st trip DTC.

Is 1st trip DTC detected?

YES >>

Refer to DTC Diagnosis Procedure.

NO-1 >>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2 >>

Confirmation after repair: INSPECTION END

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

CHECK DTC PRIORITY

If DTC P0404 is displayed with DTC P044A or P044E, first perform the confirmation procedure (trouble diagnosis) for DTC P044A or P044E.

Is applicable DTC detected?
YES >>
Perform diagnosis of applicable.
- DTC P044A: Refer to DTC Description.
- DTC P044E: Refer to DTC Description.
NO >>
GO TO 2.
CHECK EGR VOLUME CONTROL VALVE

Check EGR volume control valve. Refer to Component Inspection.

Is the inspection result normal?
YES >>
INSPECTION END
NO >>
Repair or replace malfunctioning part.

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