Nissan Sentra B18 (2020-2025) Service Manual: P0454 Evap System Pressure Sensor

Nissan Sentra B18 (2020-2025) Service Manual / Engine / Work Procedure (After Replacing Electric Throttle Control Actuator) / Dtc/circuit Diagnosis / P0454 Evap System Pressure Sensor

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC		CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P0454	00	EVAP SYS PRES SEN (EVAP system pressure sensor/switch "A" circuit intermittent)	Diagnosis condition	—
			Signal (terminal)	EVAP control system pressure sensor signal
			Threshold	ECM detects a sloshing signal from the EVAP control system pressure sensor
			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

DTC CONFIRMATION PROCEDURE

Note:

Never remove fuel filler cap during DTC confirmation procedure.

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.

Do you have CONSULT?
With CONSULT>>
GO TO 2.
Without CONSULT>>
GO TO 5.
PERFORM DTC CONFIRMATION PROCEDURE-1

With CONSULT
1. Start the engine and let it idle for least 40 seconds.
  Note:
  Do not depress accelerator pedal even slightly.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >>
Refer to DTC Diagnosis Procedure.
NO >>
GO TO 3.
PERFORM DTC CONFIRMATION PROCEDURE-2

With CONSULT
1. Select “EVAP DIAG READY” in “DATA MONITOR” mode of “ENGINE” using CONSULT.
2. Let it idle until “OFF” of “EVAP DIAG READY” changes to “ON”.
  Note:
  It will take at most 2 hours until “OFF” of “EVAP DIAG READY” changes to “ON”.
3. Turn ignition switch OFF and wait at least 90 minutes.
  Note:
  Never turn ignition switch ON during 90 minutes.
4. Turn ignition switch ON.
5. Select “EVAP LEAK DIAG” in “DATA MONITOR” mode of “ENGINE” using CONSULT.
6. Check that “EVAP LEAK DIAG” indication.
Which is displayed on CONSULT?
“CMPLT”>>
GO TO 4.
“YET”>>
1. Perform DTC CONFIRMATION PROCEDURE again.
2. GO TO 1.
PERFORM DTC CONFIRMATION PROCEDURE-3

With CONSULT

Check 1st trip DTC.

Is 1st trip DTC detected?
YES >>
Refer to DTC Diagnosis Procedure.
NO-1 >>
To check malfunction symptom before repair: Refer to Intermittent Incident.
NO-2 >>
Confirmation after repair: INSPECTION END
PERFORM DTC CONFIRMATION PROCEDURE-4

With GST
1. Start the engine and let it idle for least 40 seconds.
  Note:
  Do not depress accelerator pedal even slightly.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >>
Refer to DTC Diagnosis Procedure.
NO >>
GO TO 6.
PERFORM DTC CONFIRMATION PROCEDURE-5

With GST
1. Let it idle for at least 2 hours.
2. Turn ignition switch OFF and wait at least 90 minutes.
  Note:
  Never turn ignition switch ON during 90 minutes.
3. Turn ignition switch ON.
4. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >>
Refer 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 EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER

Turn ignition switch OFF.
Disconnect EVAP control system pressure sensor harness connector.

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.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY

Turn ignition switch ON.

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

+	−	Voltage (Approx.)
B65	3	Ground	5 V

−

Voltage

(Approx.)

EVAP control system pressure sensor

Connector

Terminal

B65

Ground

5 V

Is the inspection result normal?

YES >>

GO TO 4.

NO >>

GO TO 3.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT

Turn ignition switch OFF.
Disconnect ECM harness connector.

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	Continuity
B65	3	E16	135	Existed

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.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT

Turn ignition switch OFF.
Disconnect ECM harness connector.

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	Continuity
B65	1	E16	158	Existed

Also check harness for short to power.

Is the inspection result normal?

YES >>

GO TO 5.

NO >>

Repair or replace malfunctioning part.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR SIGNAL CIRCUIT

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	Continuity
B65	2	E16	131	Existed

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.

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.

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