Nissan Murano: Dtc/circuit Diagnosis / P0451 Pressure Sensor

Nissan Murano (Z52) 2015-2024 Service Manual / Engine / Engine Control System :: Vq35de / Dtc/circuit Diagnosis / P0451 Pressure Sensor

DTC Description

DTC DETECTION LOGIC

An excessively low voltage from the sensor is sent to ECM.

DTC

CONSULT screen terms

(Trouble diagnosis content) 		DTC detection condition
P0451

EVAP SYS PRES SEN

(EVAP control system pressure sensor performance) 		Diagnosis condition Ignition switch ON
Signal (terminal)

  • EVAP control system pressure sensor signal

  • ECM

    (Built in barometric pressure sensor)
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

  • ECM

    (Built in barometric pressure sensor)

  • Clogging, cruching, or damage in hose or piping

FAIL-SAFE

Not applicable

DTC CONFIRMATION PROCEDURE

NOTE:

Never refuel before and during the following procedure.

CHECK DTC PRIORITY

If DTC P0451 is displayed with 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.

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.

PERFORM DTC CONFIRMATION PROCEDURE

  1. Turn ignition switch ON.

  2. Check 1st trip DTC.

Is 1st trip DTC detected?

YES>>

Proceed to Diagnosis Procedure.

NO>>

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

NO>>

Confirmation after repair: INSPECTION END

Diagnosis Procedure

CHECK HOSE AND PIPING

  1. Turn ignition switch OFF.

  2. Check the following.

  • Blockage, crush, or damage in the hose and 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.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

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

Is the inspection result normal?

YES>>

Check intermittent incident. Refer to Intermittent Incident.

NO>>

Replace EVAP control system pressure sensor. Refer to Removal and Installation.

Component Inspection

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

  1. Turn ignition switch OFF.

  2. Remove EVAP control system pressure sensor with its harness connector. Refer to Removal and Installation.

    Always replace O-ring with a new one.

  3. Install a vacuum pump to EVAP control system pressure sensor.

  4. Turn ignition switch ON and check output voltage between ECM terminals under the following conditions.

    ECM

    Applied vacuum kPa

    (bar, kg/cm2, psi)     		Voltage
    Connector + –
    Terminal Terminal
    E32 121 148 Not applied 1.8 - 4.8 V
    -26.7 (-0.267, -0.272, -3.87) 2.1 to 2.5 V lower than above value

    CAUTION:

    • Always calibrate the vacuum pump gauge when using it.

    • Never apply below −93.3 kPa (−0.933 bar, −0.952 kg/cm2, −13.53 psi) or pressure over 101.3 kPa (1.013 bar, 1.033 kg/cm2, 14.69 psi).

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace EVAP control system pressure sensor. Refer to Removal and Installation.

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