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Nissan Sentra B18 (2020-2025) Service Manual: P0451 Evap Control System Pressure Sensor

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

P0451

Barometric pressure sensor A/B

(EVAP System Pressure Sensor/Switch "A" Circuit Range/Performance

Diagnosis condition

Ignition switch ON

Signal (terminal)

EVAP control system pressure sensor signal

Threshold

ECM detects a state that the pressure difference remains  the threshold value or more for continuously for 5 seconds or more under the condition that the pressure of the EVAP control system pressure sensor and that of the Barometric pressure sensor are equal.

Diagnosis delay time

3 seconds or more

POSSIBLE CAUSE

  • EVAP control system pressure sensor

  • Barometric pressure sensor (builtinto ECM)

  • Clogging, crushing, or damage in hose or piping.

FAIL-SAFE

Not applicable

Confirmation Procedure

Confirmation Procedure

  1. CHECK DTC PRIORITY

    If DTC P0451 is displayed with DTC P0452 or P0453, first perform the trouble diagnosis for DTC P0452 or P0453.

    Is DTC P0452, or P0453 detected?

    YES >>

    Perform diagnosis of applicable.

    • DTC P0452: Refer to DTC Description.

    • DTC P0453: Refer to DTC Description.

    NO >>

    GO TO 2.

  2. PRECONDITIONING

    If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

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

    2. Turn ignition switch ON.

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

    >>

    GO TO 3.

  3. PERFORM DTC CONFIRMATION PROCEDURE

    1. Turn ignition switch ON.

    2. Check 1st trip DTC.

    Is 1st trip DTC detected?

    YES >>

    Proceed 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 HOSE AND PIPING

    1. Turn ignition switch OFF.

    2. Check the following.

      • Blockage, crush, or damage in the hose and the piping of EVAP purge line between fuel tank and intake manifold.

      • Blockage, crush, or damage in the hose and the piping of intake air passage between inlet air duct and intake manifold.

    Is the inspection result normal?

    YES >>

    GO TO 2.

    NO >>

    Repair or replace error-detected parts.

  2. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

    Check EVAP control system pressure sensor.

    Is the inspection result normal?

    YES >>

    GO TO 3.

    NO >>

    Replace EVAP control system pressure sensor.

  3. CHECK BAROMETRIC PRESSURE SENSOR

    Check barometric pressure sensor. Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    Check intermittent incident. Refer to Intermittent Incident.

    NO >>

    Repair or replase malfunctioning part. Refer to Removal & Installation.

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