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Nissan Sentra B18 (2020-2025) Service Manual: P0452 Evap Control System Pressure Sensor

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

P0452

EVAP SYS PRES SEN

(Evaporative emission system pressure sensor/switch low)

Diagnosis condition

—

Signal (terminal)

EVAP control system pressure sensor signal

Threshold

An excessively low voltage from the sensor is sent to ECM

Diagnosis delay time

—

POSSIBLE CAUSE

  • Harness or connectors (EVAP control system pressure sensor circuit is shorted.)

  • EVAP control system pressure sensor

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.

    TESTING CONDITION:

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

    >>

    GO TO 2.

  2. PERFORM DTC CONFIRMATION PROCEDURE

    With CONSULT

    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. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.

    5. Make sure that “FUEL T/TMP SE” indication is more than 0°C (32°F).

    6. Start the engine and wait at least 20 seconds.

    7. Check 1st trip DTC.

    With GST

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

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

      ECM

      Voltage

      Connector

      +

      −

      Terminal

      E16

      138

      158

      Less than 4.2 V

    3. Make sure that the voltage is less than 4.2 V.

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

    5. Start engine and wait at least 20 seconds.

    6. 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 EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER

    1. Turn ignition switch OFF.

    2. Disconnect EVAP control system pressure sensor harness connector.

    3. Check sensor harness connector for water.

      Water should not exist.

    Is the inspection result normal?

    YES >>

    GO TO 2.

    NO >>

    Repair or replace harness connector.

  2. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY

    1. Turn ignition switch ON.

    2. Check the voltage between EVAP control system pressure sensor harness connector and ground.

      +

      −

      Voltage

      (Approx.)

      EVAP control system pressure sensor

      Connector

      Terminal

      B65

      3

      Ground

      5 V

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    GO TO 3.

  3. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

    3. Check the continuity between EVAP control system pressure sensor harness connector and ECM harness connector.

      EVAP control system pressure sensor

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      B65

      3

      E16

      135

      Existed

    4. Also check harness for short to ground and to power.

    Is the inspection result normal?

    YES >>

    Perform the trouble diagnosis for power supply circuit.

    NO >>

    Repair or replace malfunctioning part.

  4. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

    3. Check the continuity between EVAP control system pressure sensor harness connector and ECM harness connector.

      EVAP control system pressure sensor

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      B65

      1

      E16

      158

      Existed

    4. Also check harness for short to power.

    Is the inspection result normal?

    YES >>

    GO TO 5.

    NO >>

    Repair or replace malfunctioning part.

  5. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR SIGNAL CIRCUIT

    1. Check the continuity between EVAP control system pressure sensor harness connector and ECM harness connector.

      EVAP control system pressure sensor

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      B65

      2

      E16

      131

      Existed

    2. Also check harness for short to ground and to power.

    Is the inspection result normal?

    YES >>

    GO TO 6.

    NO >>

    Repair or replace malfunctioning part.

  6. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

    Check the EVAP control system pressure sensor. Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

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

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