Nissan Pathfinder (2012 year). Manual — part 272
P0448 EVAP CANISTER VENT CONTROL VALVE
EC-257
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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P0448 EVAP CANISTER VENT CONTROL VALVE
Component Description
INFOID:0000000007358170
The EVAP canister vent control valve (3) is located on the EVAP
canister (4) and is used to seal the canister vent.
This solenoid valve responds to signals from the ECM. When the
ECM sends an ON signal, the coil in the solenoid valve is energized.
A plunger will then move to seal the canister vent. The ability to seal
the vent is necessary for the on board diagnosis of other evaporative
emission control system components.
This solenoid valve is used only for diagnosis, and usually remains
opened.
When the vent is closed, under normal purge conditions, the evapo-
rative emission control system is depressurized and allows EVAP
Control System diagnosis.
• Fuel filler pipe (top of frame view) (1)
• EVAP control system pressure sensor (2)
• Drain filter (5)
•
: Vehicle front
On Board Diagnosis Logic
INFOID:0000000007358171
DTC Confirmation Procedure
INFOID:0000000007358172
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step.
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
1. Turn ignition switch ON and wait at least 5 seconds.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT.
4. Start engine and let it idle for at least 1 minute.
5. Repeat next procedures 3 times.
PBIB3642E
AWBIA0134ZZ
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0448
0448
EVAP canister vent con-
trol valve close
EVAP canister vent control valve remains
closed under specified driving conditions.
• EVAP canister vent control valve
• EVAP control system pressure sensor
and the circuit
• Blocked rubber tube to EVAP canister
vent control valve
• Drain filter
• EVAP canister is saturated with water
August 2012
2012 Pathfinder
EC-258
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P0448 EVAP CANISTER VENT CONTROL VALVE
a. Increase the engine speed between 3,000 and 3,500 rpm and maintain that speed for 2 minutes and 50
seconds to 3 minutes.
Never exceed 3 minutes.
b. Fully released accelerator pedal and keep engine idle for about 5 seconds.
6. Check 1st trip DTC.
7. If 1st trip DTC is detected, go to
If 1st trip DTC is not detected, go to the next step.
8. Repeat next procedure 20 times.
a. Quickly increase the engine speed between 4,000 and 4,500 rpm or more and maintain that speed for 25
to 30 seconds.
b. Fully released accelerator pedal and keep engine idle for at least 35 seconds.
9. Check 1st trip DTC.
10. If 1st trip DTC is detected, go to
WITH GST
Follow the procedure “WITH CONSULT” above.
Diagnosis Procedure
INFOID:0000000007358173
1.
CHECK RUBBER TUBE
1. Turn ignition switch OFF.
2. Disconnect rubber tube connected to EVAP canister vent control
valve (3).
-
Fuel filler pipe (top of frame view) (1)
-
EVAP control system pressure sensor (2)
-
EVAP canister (4)
-
Drain filter (5)
-
: Vehicle front
3. Check the rubber tube for clogging.
OK or NG
OK
>> GO TO 2.
NG
>> Clean rubber tube using an air blower.
2.
CHECK DRAIN FILTER
EC-255, "Component Inspection"
OK or NG
OK
>> GO TO 3.
NG
>> Replace drain filter. Refer to
.
3.
CHECK EVAP CANISTER VENT CONTROL VALVE
EC-259, "Component Inspection"
OK or NG
OK
>> GO TO 4.
NG
>> Replace EVAP canister vent control valve. Refer to
FL-16, "Removal and Installation"
.
4.
CHECK IF EVAP CANISTER SATURATED IS WITH WATER
JMBIA1516GB
AWBIA0134ZZ
August 2012
2012 Pathfinder
P0448 EVAP CANISTER VENT CONTROL VALVE
EC-259
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached. Refer to
FL-16, "Removal and Installation"
.
2. Check if water will drain from the EVAP canister.
Yes or No
Yes
>> GO TO 5.
No
>> GO TO 7.
5.
CHECK EVAP CANISTER
Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor
attached.
The weight should be less than 2.0 kg (4.4 lb).
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 6.
6.
DETECT MALFUNCTIONING PART
Check the following.
• EVAP canister for damage
• EVAP hose between EVAP canister and drain filter for clogging or poor connection
>> Repair hose or replace EVAP canister. Refer to
FL-16, "Removal and Installation"
7.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR
1. Disconnect EVAP control system pressure sensor harness connector.
2. Check connectors for water.
OK or NG
OK
>> GO TO 8.
NG
>> Replace EVAP control system pressure sensor. Refer to
FL-16, "Removal and Installation"
.
8.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-269, "Component Inspection"
OK or NG
OK
>> GO TO 9.
NG
>> Replace EVAP control system pressure sensor. Refer to
FL-16, "Removal and Installation"
.
9.
CHECK INTERMITTENT INCIDENT
GI-37, "Intermittent Incident"
.
>>
INSPECTION END
Component Inspection
INFOID:0000000007358174
EVAP CANISTER VENT CONTROL VALVE
With CONSULT
1. Remove EVAP canister vent control valve from EVAP canister. Refer to
FL-16, "Removal and Installation"
.
BBIA0558E
Water should not exist.
August 2012
2012 Pathfinder
EC-260
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P0448 EVAP CANISTER VENT CONTROL VALVE
2. Check portionof
B
EVAP canister vent control valve for being
rusted.
If NG, replace EVAP canister vent control valve.
If OK, go to next step.
3. Reconnect harness connectors disconnected.
4. Turn ignition switch ON.
5. Perform “VENT CONTROL/V” in “ACTIVE TEST” mode.
6. Check air passage continuity and operation delay time.
Check that new O-ring is installed properly.
Operation takes less than 1 second.
If NG, go to next step.
7. Clean the air passage (portion
A
to
B
) of EVAP canister vent control valve using an air blower.
8. Perform step 6 again.
9. If NG, replace EVAP canister vent control valve. Refer to
FL-16, "Removal and Installation"
Without CONSULT
1. Remove EVAP canister vent control valve from EVAP canister. Refer to
FL-16, "Removal and Installation"
.
2. Check portion
B
of EVAP canister vent control valve for being
rusted.
3. Check air passage continuity and operation delay time under the
following conditions.
Check that new O-ring is installed properly.
Operation takes less than 1 second.
If NG, go to next step.
4. Clean the air passage (portion
A
to
B
) of EVAP canister vent control valve using an air blower.
5. Perform step 3 again.
6. If NG, replace EVAP canister vent control valve. Refer to
FL-16, "Removal and Installation"
PBIB1033E
Condition VENT CONTROL/V
Air passage continuity
between (A) and (B)
ON
No
OFF
Yes
PBIB1033E
Condition
Air passage continuity
between (A) and (B)
12V direct current supply between
terminals 1 and 2
No
OFF
Yes
PBIB1034E
August 2012
2012 Pathfinder
P0448 EVAP CANISTER VENT CONTROL VALVE
EC-261
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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DRAIN FILTER
1. Check visually for insect nests in the drain filter air inlet.
2. Check visually for cracks or flaws in the appearance.
3. Check visually for cracks or flaws in the hose.
4. Blow air into port A and check that it flows freely out of port B.
5. Block port B.
6. Blow air into port A and check that there is no leakage.
7. If NG, replace drain filter. Refer to
.
PBIB3641E
August 2012
2012 Pathfinder
EC-262
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
Component Description
INFOID:0000000007358175
The EVAP control system pressure sensor (2) detects pressure in
the purge line. The sensor output voltage to the ECM increases as
pressure increases.
• Fuel filler pipe (top of frame view) (1)
• EVAP canister vent control valve (3)
• EVAP canister (4)
• Drain filter (5)
•
: Vehicle front
On Board Diagnosis Logic
INFOID:0000000007358176
If DTC P0451 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
.
DTC Confirmation Procedure
INFOID:0000000007358177
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.
AWBIA0134ZZ
PBIB3370E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0451
0451
EVAP control system
pressure sensor perfor-
mance
ECM detects a sloshing signal from the EVAP
control system pressure sensor
• Harness or connectors
• EVAP control system pressure sensor
August 2012
2012 Pathfinder
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-263
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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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?
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:0000000007358178
1.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
August 2012
2012 Pathfinder
EC-264
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
2. Loosen and retighten three ground screws on the body. Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK EVPA CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER
1. Disconnect EVAP control system pressure sensor (2) harness
connector.
-
Fuel filler pipe (top of frame view) (1)
-
EVAP canister vent control valve (3)
-
EVAP canister (4)
-
Drain filter (5)
-
: Vehicle front
2. Check sensor harness connector for water.
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace harness connector.
3.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-264, "Component Inspection"
OK or NG
OK
>> GO TO 4.
NG
>> Replace EVAP control system pressure sensor. Refer to
FL-16, "Removal and Installation"
.
4.
CHECK INTERMITTENT INCIDENT
GI-37, "Intermittent Incident"
>>
INSPECTION END
Component Inspection
INFOID:0000000007358179
EVAP CONTROL SYSTEM PRESSURE SENSOR
1. Remove EVAP control system pressure sensor with its harness connector connected from EVAP canister.
FL-16, "Removal and Installation"
Do not reuse the O-ring, replace it with a new one.
2. Install a vacuum pump to EVAP control system pressure sensor.
BBIA0539E
Water should not exist.
AWBIA0134ZZ
August 2012
2012 Pathfinder
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