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 >
[MRA8DE]
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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
.
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
.
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
.
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
.
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
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
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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
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