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

Nissan Sentra B18 (2020-2025) Service Manual / Engine / Work Procedure (After Replacing Electric Throttle Control Actuator) / Dtc/circuit Diagnosis / 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

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.
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 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

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.
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.
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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