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Nissan Sentra B18 (2020-2025) Service Manual: 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

  1. 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.

  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.

  3. PERFORM DTC CONFIRMATION PROCEDURE

    1. 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

    2. Drive the Nissan Sentra vehicle at 50 km/h (32 MPH) or more for at least 5 seconds.

    3. 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

  1. 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.

  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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