Nissan Sentra. Manual - part 403

EC-308

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

P0448 EVAP CANISTER VENT CONTROL VALVE

3. Check air passage continuity and operation delay time.

Make sure new O-ring is installed properly.

Operation takes less than 1 second.

Without CONSULT

1. Clean the air passage [portion  to  ] of EVAP canister vent

control valve using an air blower.

2. Check air passage continuity and operation delay time under the following conditions.

Make sure new O-ring is installed properly.

Operation takes less than 1 second.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace EVAP canister vent control valve. Refer to 

FL-15, "Removal and Installation"

.

Condition

(VENT CONT/V)

Air passage continuity between 

 and 

ON

Not existed

OFF

Existed

Condition

Air passage continuity between 

 and 

12 V direct current supply between
 terminals 1 and 2

Not existed

OFF

Existed

JMBIA0169ZZ

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-309

< DTC/CIRCUIT DIAGNOSIS >

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P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

DTC Logic

INFOID:0000000009758548

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

NOTE:

Never remove fuel filler cap during DTC confirmation procedure.

1.

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.

With CONSULT>>GO TO 2.
Without CONSULT>>GO TO 5.

2.

PERFORM DTC CONFIRMATION PROCEDURE-1

With CONSULT

1. Start 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

>> Proceed to 

EC-310, "Diagnosis Procedure"

.

NO

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE-2

With CONSULT

1. Select “EVAP DIAG READY” in “DATA MONITOR” mode of “ENGINE”.

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”.

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.

4.

PERFORM DTC CONFIRMATION PROCEDURE-3

With CONSULT

Check 1st trip DTC.
Is 1st trip DTC detected?

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0451

EVAP SYS PRES SEN
(Evaporative emission system 
pressure sensor/switch range/
performance)

ECM detects a sloshing signal from the 
EVAP control system pressure sensor

• Harness or connectors

(EVAP control system pressure sensor 
circuit is shorted.)

• EVAP control system pressure sensor

EC-310

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

YES

>> Proceed to 

EC-310, "Diagnosis Procedure"

.

NO

>> INSPECTION END

5.

PERFORM DTC CONFIRMATION PROCEDURE-4

With GST

1. Start 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

>> Proceed to 

EC-310, "Diagnosis Procedure"

.

NO

>> GO TO 6.

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

>> Proceed to 

EC-310, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009758549

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.

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.

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 har-

ness connector.

Water should not exist.

+

−

Voltage

(Approx.)

EVAP control system pressure sen-

sor

Connector

Terminal

B47

3

Ground

5 V

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-311

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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 error-detected parts

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 har-

ness connector.

4. Also check harness for short to power.
Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace error-detected parts.

5.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR SIGNAL CIRCUIT

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

ness connector.

2. Also check harness for short to ground and to power.
Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace error-detected parts.

6.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Check the EVAP control system pressure sensor. Refer to 

EC-311, "Component Inspection"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-39, "Intermittent Incident"

.

NO

>> Replace EVAP control system pressure sensor. Refer to 

FL-15, "Removal and Installation"

.

Component Inspection

INFOID:0000000009758550

1.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

1. Turn ignition switch OFF.

2. Remove EVAP control system pressure sensor with its harness connector connected from EVAP canister.

Always replace O-ring with a new one.

+

−

Continuity

EVAP control system pres-

sure sensor

ECM

Connector

Terminal

Connector

Terminal

B47

3

E16

113

Existed

+

−

Continuity

EVAP control system pres-

sure sensor

ECM

Connector

Terminal

Connector

Terminal

B47

1

E16

124

Existed

+

−

Continuity

EVAP control system pres-

sure sensor

ECM

Connector

Terminal

Connector

Terminal

B47

2

E16

114

Existed