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Nissan Sentra B18 (2020-2025) Service Manual: P0441 Evap Control System

Dtc Description

DTC Description

In this evaporative emission (EVAP) control system, purge flow occurs during non-closed throttle conditions. Purge volume is related to air intake volume. Under normal purge conditions (non-closed throttle), the EVAP canister purge volume control solenoid valve is open to admit purge flow. Purge flow exposes the EVAP control system pressure sensor to intake manifold vacuum.

Under normal conditions (non-closed throttle), sensor output voltage indicates if pressure drop and purge flow are adequate. If not, a malfunction is determined.

DTC DETECTION LOGIC

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

P0441

EVAP PURG FLOW/MON

(Evaporative emission system incorrect purge flow)

Diagnosis condition

—

Signal (terminal)

—

Threshold

EVAP control system does not operate properly, EVAP control system has a leak between intake manifold and EVAP control system pressure sensor

Diagnosis delay time

—

POSSIBLE CAUSE

  • EVAP canister purge volume control solenoid valve stuck closed

  • EVAP control system pressure sensor and the circuit

  • Loose, disconnected or improper connection of rubber tube

  • Blocked rubber tube

  • Cracked EVAP canister

  • EVAP canister purge volume control solenoid valve circuit

  • Accelerator pedal position sensor

  • Blocked purge port

  • EVAP canister vent control valve

FAIL-SAFE

Not applicable

Confirmation Procedure

Confirmation Procedure

  1. 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.

    Will CONSULT be used?

    YES >>

    GO TO 2.

    NO >>

    GO TO 5.

  2. PERFORM DTC CONFIRMATION PROCEDURE-1

    With CONSULT

    TESTING CONDITION:

    Always perform test at a temperature of 5°C (41°F) or more.

    1. Start the engine and warm it up to normal operating temperature.

    2. Turn ignition switch OFF and wait at least 10 seconds.

    3. Turn ignition switch ON.

    4. Turn ignition switch OFF and wait at least 10 seconds.

    5. Start engine and let it idle for at least 70 seconds.

    6. Select “PURG FLOW P0441” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” mode of “ENGINE” using CONSULT.

    7. Touch “START”.

    Is “COMPLETED” displayed on CONSULT screen?

    YES >>

    GO TO 4.

    NO >>

    GO TO 3.

  3. PERFORM DTC CONFIRMATION PROCEDURE-2

    When the following conditions are met, “TESTING” will be displayed on the CONSULT screen. Maintain the conditions continuously until “TESTING” changes to “COMPLETED”. (It will take at least 35 seconds.)

    Selector lever

    Suitable position

    VHCL SPEED SE

    32 – 120 km/h (20 – 75 MPH)

    ENG SPEED

    500 – 3,300 rpm

    B/FUEL SCHDL

    1.0 – 6.5 msec

    COOLANT TEMP/S

    More than 0°C (32°F)

    CAUTION:

    Always drive Nissan Sentra vehicle at a safe speed.

    Note:

    If “TESTING” does not change for a long time, retry from step 2.

    Is “COMPLETED” displayed on CONSULT screen?

    YES >>

    GO TO 4.

    NO >>

    Perform DTC CONFIRMATION PROCEDURE again. GO TO 2.

  4. PERFORM DTC CONFIRMATION PROCEDURE-3

    Touch “SELF-DIAG RESULTS”.

    Is “OK” displayed on CONSULT screen?

    YES-1 >>

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

    YES-2 >>

    Confirmation after repair: INSPECTION END

    NO >>

    Proceed to DTC Diagnosis Procedure.

  5. PERFORM COMPONENT FUNCTION CHECK

    Note:

    Use component function check to check the overall monitoring function of the EVAP control system purge flow monitoring. During this check, a 1st trip DTC might not be confirmed.

    With GST

    1. Lift up drive wheels.

    2. Start engine (VDC switch OFF) and warm it up to normal operating temperature.

    3. Turn ignition switch OFF and wait at least 10 seconds.

    4. Start engine and wait at least 70 seconds.

    5. Set voltmeter probes to ECM harness connector terminals as per the following.

      ECM

      Connector

      +

      −

      Terminal

      E16

      131

      158

    6. Check EVAP control system pressure sensor value at idle speed and note it.

    7. Establish and maintain the following conditions for at least 1 minute.

      Air conditioner switch

      ON

      Headlamp switch

      ON

      Rear window defogger switch

      ON

      Engine speed

      Approx. 3,000 rpm

      Selector lever position

      Any position other than P, N or R

    8. Verify that EVAP control system pressure sensor value stays 0.1 V less than the value at idle speed (measured at step 6) for at least 1 second.

    Is the inspection result normal?

    YES-1 >>

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

    YES-2 >>

    Confirmation after repair: INSPECTION END

    NO >>

    Proceed to DTC Diagnosis Procedure.

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

  1. CHECK EVAP CANISTER

    1. Turn ignition switch OFF.

    2. Check EVAP canister for cracks.

    Is the inspection result normal?

    YES-1 >>

    With CONSULT: GO TO 2.

    YES-2 >>

    Without CONSULT: GO TO 3.

    NO >>

    Replace EVAP canister. Refer to Removal and Installation.

  2. CHECK PURGE FLOW

    With CONSULT

    1. Disconnect vacuum hose connected to EVAP canister purge volume control solenoid valve at EVAP service port. Refer to Exploded View.

    2. Start the engine and let it idle.

    3. Select “PURG VOL CONT/V” in “ACTIVE TEST” mode of “ENGINE” using CONSULT.

    4. Touch “Qd” and “Qu” on CONSULT screen to adjust “PURG VOL CONT/V” opening and check vacuum existence.

      PURG VOL CONT/V

      Vacuum

      100%

      Existed

      0%

      Not existed

    Is the inspection result normal?

    YES >>

    GO TO 7.

    NO >>

    GO TO 4.

  3. CHECK PURGE FLOW

    Without CONSULT

    1. Start the engine and warm it up to normal operating temperature.

    2. Stop the engine.

    3. Disconnect vacuum hose connected to EVAP canister purge volume control solenoid valve at EVAP service port and install vacuum gauge. Refer to Exploded View.

    4. Start engine and let it idle.

      Never depress accelerator pedal even slightly.

    5. Check vacuum gauge indication before 60 seconds pass after starting engine.

      Vacuum should not exist.

    6. Rev engine up to 2,000 rpm after 100 seconds pass after starting engine.

      Vacuum should exist.

    Is the inspection result normal?

    YES >>

    GO TO 7.

    NO >>

    GO TO 4.

  4. CHECK EVAP PURGE LINE

    1. Turn ignition switch OFF.

    2. Check EVAP purge line for improper connection or disconnection. Refer to System Description.

    Is the inspection result normal?

    YES >>

    GO TO 5.

    NO >>

    Repair EVAP purge line.

  5. CHECK EVAP PURGE HOSE AND PURGE PORT

    1. Disconnect purge hoses connected to EVAP service port and EVAP canister purge volume control solenoid valve .

    2. Blow air into each hose and EVAP purge port .

    3. Check that air flows freely.

    Is the inspection result normal?

    YES-1 >>

    With CONSULT: GO TO 6.

    YES-2 >>

    Without CONSULT: GO TO 7.

    NO >>

    Repair or clean hoses and/or purge port.

  6. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

    With CONSULT

    1. Start the engine.

    2. Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode of “ENGINE” using CONSULT. Check that engine speed varies according to the valve opening.

    Does engine speed vary according to the valve opening?

    YES >>

    GO TO 8.

    NO >>

    GO TO 7.

  7. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

    Check the EVAP canister purge volume control solenoid valve. Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    GO TO 8.

    NO >>

    Replace EVAP canister purge volume control solenoid valve. Refer to Exploded View.

  8. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR

    1. Disconnect EVAP control system pressure sensor harness connector.

    2. Check that water is not inside connectors.

    Is the inspection result normal?

    YES >>

    GO TO 9.

    NO >>

    Replace EVAP control system pressure sensor. Refer to Exploded View.

  9. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR FUNCTION

    Refer to DTC Description for DTC P0452, refer to DTC Description for DTC P0453.

    Is the inspection result normal?

    YES >>

    GO TO 10.

    NO >>

    Replace EVAP control system pressure sensor. Refer to Exploded View.

  10. CHECK RUBBER TUBE FOR CLOGGING

    1. Disconnect rubber tube connected to EVAP canister vent control valve.

    2. Check the rubber tube for clogging.

    Is the inspection result normal?

    YES >>

    GO TO 11.

    NO >>

    Clean the rubber tube using an air blower.

  11. CHECK EVAP CANISTER VENT CONTROL VALVE

    Check the EVAP canister vent control valve. Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    GO TO 12.

    NO >>

    Replace EVAP canister vent control valve. Refer to Exploded View.

  12. CHECK EVAP PURGE LINE

    Inspect EVAP purge line (pipe and rubber tube). Check for evidence of leaks.

    Is the inspection result normal?

    YES >>

    GO TO 13.

    NO >>

    Repair or replace malfunctioning part.

  13. CLEAN EVAP PURGE LINE

    Clean EVAP purge line (pipe and rubber tube) using air blower.

    >>

    INSPECTION END

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