Nissan Frontier. Manual — part 431
P0448 EVAP CANISTER VENT CONTROL VALVE
EC-295
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
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If 1st trip DTC is not detected, go to the next step.
7. Repeat next procedure 20 times.
a. Quickly increase the engine speed between 4,000 and 4,500 rpm and maintain that speed for 25 to 30
seconds.
b. Fully released accelerator pedal and keep engine idle for at least 35 seconds.
8. Check 1st trip DTC.
9. If 1st trip DTC is detected, go to
WITH GST
Follow the procedure “WITH CONSULT” above.
Diagnosis Procedure
INFOID:0000000009480957
1.
CHECK RUBBER TUBE
1. Turn ignition switch OFF.
2. Disconnect rubber tube connected to EVAP canister vent control
valve (1).
- EVAP control system pressure sensor (2)
- Drain filter (3)
- EVAP canister (4)
-
: 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 EVAP CANISTER VENT CONTROL VALVE
EC-296, "Component Inspection"
OK or NG
OK
>> GO TO 3.
NG
>> Replace EVAP canister vent control valve. Refer to
FL-14, "Removal and Installation"
.
3.
CHECK IF EVAP CANISTER IS SATURATED WITH WATER
1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.
2. Does water drain from the EVAP canister?
Yes or No
Yes
>> GO TO 4.
No
>> GO TO 6.
JMBIA1516GB
ALBIA0514ZZ
BBIA0558E
EC-296
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
P0448 EVAP CANISTER VENT CONTROL VALVE
4.
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 6.
NG
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
• EVAP canister for damage
• EVAP hose between EVAP canister and vehicle frame for clogging or poor connection
>> Repair hose or replace EVAP canister.
6.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR
1. Disconnect EVAP control system pressure sensor (2) harness
connector.
- EVAP canister vent control valve (1)
- Drain filter (3)
- EVAP canister (4)
-
: Vehicle front
2. Check that water is not inside connectors.
OK or NG
OK
>> GO TO 7.
NG
>> Replace EVAP control system pressure sensor. Refer to
FL-14, "Removal and Installation"
7.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-309, "Component Inspection"
OK or NG
OK
>> GO TO 8.
NG
>> Replace EVAP control system pressure sensor. Refer to
FL-14, "Removal and Installation"
.
8.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000009480958
EVAP CANISTER VENT CONTROL VALVE
With CONSULT
1. Remove EVAP canister vent control valve from EVAP canister.
2. Check portion B of 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.
ALBIA0514ZZ
PBIB1033E
P0448 EVAP CANISTER VENT CONTROL VALVE
EC-297
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
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5. Perform “VENT CONTROL/V” in “ACTIVE TEST” mode.
6. Check air passage continuity and operation delay time.
Operation takes less than 1 second.
Make sure new O-ring is installed properly.
If NG, replace EVAP canister vent control valve.
If OK, 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.
Without CONSULT
1. Remove EVAP canister vent control valve from EVAP canister.
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.
Operation takes less than 1 second.
Make sure new O-ring is installed properly.
If NG, replace EVAP canister vent control valve.
If OK, 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.
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
EC-298
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
Component Description
INFOID:0000000009480959
The EVAP control system pressure sensor (2) detects pressure in
the purge line. The sensor output voltage to the ECM increases as
pressure increases.
• EVAP canister vent control valve (1)
• Drain filter (3)
• EVAP canister (4)
•
: Vehicle front
On Board Diagnosis Logic
INFOID:0000000009480960
NOTE:
If DTC P0451 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
.
DTC Confirmation Procedure
INFOID:0000000009480961
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?
ALBIA0514ZZ
PBIB3370E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0451
0451
EVAP control system pressure
sensor performance
ECM detects a sloshing signal from the
EVAP control system pressure sensor
• Harness or connectors
• EVAP control system pressure sensor
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