Nissan Xterra. Instruction — part 296
EC-310
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P0447 EVAP CANISTER VENT CONTROL VALVE
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.
Make sure 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.
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.
PBIB1033E
Condition
Air passage continuity
between (A) and (B)
12V direct current supply between
terminals 1 and 2
No
OFF
Yes
PBIB1034E
PBIB3641E
P0448 EVAP CANISTER VENT CONTROL VALVE
EC-311
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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P0448 EVAP CANISTER VENT CONTROL VALVE
Component Description
INFOID:0000000009484015
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 (1)
• EVAP control system pressure sensor (2)
• Drain filter (5)
•
: Vehicle front
On Board Diagnosis Logic
INFOID:0000000009484016
DTC Confirmation Procedure
INFOID:0000000009484017
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
AWBIA0223ZZ
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
EC-312
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
P0448 EVAP CANISTER VENT CONTROL VALVE
a. Increase the engine speed up to between 3,000 and 3,500 rpm and maintain that speed for 2 minutes and
50 seconds to 3 minutes.
Do not 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 up to 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:0000000009484018
1.
CHECK RUBBER TUBE
1. Turn ignition switch OFF.
2. Disconnect rubber tube connected to EVAP canister vent control
valve (3).
-
Fuel filler pipe (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-309, "Component Inspection"
OK or NG
OK
>> GO TO 3.
NG
>> Replace drain filter.
3.
CHECK EVAP CANISTER VENT CONTROL VALVE
EC-313, "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
AWBIA0223ZZ
P0448 EVAP CANISTER VENT CONTROL VALVE
EC-313
< DTC/CIRCUIT DIAGNOSIS >
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1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.
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-323, "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-40, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000009484019
EVAP CANISTER VENT CONTROL VALVE
With CONSULT
1. Remove EVAP canister vent control valve from EVAP canister.
BBIA0558E
Water should not exist.
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