Nissan Titan. Instruction — part 259
P0456 EVAP CONTROL SYSTEM
EC-337
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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4. Using EVAP leak detector, locate the EVAP leak. For the leak
detector, refer to the instruction instruction for more details.
.
OK or NG
OK
>> GO TO 8.
NG
>> Repair or replace.
7.
CHECK FOR EVAP LEAK
Without CONSULT
1. Turn ignition switch OFF.
2. Apply 12 volts DC to EVAP canister vent control valve (4). The
valve will close. (Continue to apply 12 volts until the end of test.)
3. Pressurize the EVAP line using pressure pump with 1.3 to 2.7 kPa (10 to 20 mmHg, 0.39 to 0.79 inHg),
then remove pump and EVAP service port adapter.
CAUTION:
• Do not use compressed air or a high pressure pump.
• Do not exceed 4.12 kPa (0.042 kg/cm
2
, 0.6 psi) of pressure in the system.
4. Using EVAP leak detector, locate the EVAP leak. For the leak
detector, refer to the instruction instruction for more details. Refer
.
OK or NG
OK
>> GO TO 8.
NG
>> Repair or replace.
8.
CHECK DRAIN FILTER
EC-340, "Component Inspection"
OK or NG
OK
>> GO TO 9.
NG
>> Replace drain filter.
9.
CHECK EVAP CANISTER VENT CONTROL VALVE
Check the following.
• EVAP canister vent control valve is installed properly.
FL-16, "Removal and Installation"
• EVAP canister vent control valve.
EC-306, "Component Inspection"
.
OK or NG
OK
>> GO TO 10.
SEF200U
1
: Drain filter
2
: EVAP control system pressure sensor
3
: EVAP canister
ALBIA0401ZZ
SEF200U
EC-338
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P0456 EVAP CONTROL SYSTEM
NG
>> Repair or replace EVAP canister vent control valve and O-ring.
10.
CHECK IF EVAP CANISTER 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 11.
No (With CONSULT)>>GO TO 13.
No (Without CONSULT)>>GO TO 14.
11.
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 2.5 kg (5.5 lb).
OK or NG
OK (With CONSULT)>>GO TO 13.
OK (Without CONSULT)>>GO TO 14.
NG
>> GO TO 12.
12.
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.
13.
CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION
With CONSULT
1. Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port.
2. Start engine.
3. Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode.
4. Touch “Qu” on CONSULT screen to increase “PURG VOL CONT/V” opening to 100%.
5. Check vacuum hose for vacuum when revving engine up to 2,000 rpm.
OK or NG
OK
>> GO TO 16.
NG
>> GO TO 15.
14.
CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION
Without CONSULT
1. Start engine and warm it up to normal operating temperature.
2. Stop engine.
3. Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port.
4. Start engine and let it idle for at least 80 seconds.
5. Check vacuum hose for vacuum when revving engine up to 2,000 rpm.
OK or NG
OK
>> GO TO 17.
NG
>> GO TO 15.
BBIA0351E
Vacuum should exist.
Vacuum should exist.
P0456 EVAP CONTROL SYSTEM
EC-339
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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15.
CHECK VACUUM HOSE
Check vacuum hoses for clogging or disconnection. Refer to
.
OK or NG
OK
>> GO TO 16.
NG
>> Repair or reconnect the hose.
16.
CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
EC-303, "Component Inspection"
OK or NG
OK
>> GO TO 17.
NG
>> Replace EVAP canister purge volume control solenoid valve.
17.
CHECK FUEL TANK TEMPERATURE SENSOR
EC-253, "Component Inspection"
OK or NG
OK
>> GO TO 18.
NG
>> Replace fuel level sensor unit.
18.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-315, "Component Inspection"
OK or NG
OK
>> GO TO 19.
NG
>> Replace EVAP control system pressure sensor.
19.
CHECK EVAP PURGE LINE
Check EVAP purge line (pipe, rubber tube, fuel tank and EVAP canister) for cracks or improper connection.
.
OK or NG
OK
>> GO TO 20.
NG
>> Repair or reconnect the hose.
20.
CLEAN EVAP PURGE LINE
Clean EVAP purge line (pipe and rubber tube) using air blower.
>> GO TO 21.
21.
CHECK EVAP/ORVR LINE
Check EVAP/ORVR line between EVAP canister and fuel tank for clogging, kink, looseness and improper con-
nection. For location, refer to
OK or NG
OK
>> GO TO 22.
NG
>> Repair or replace hoses and tubes.
22.
CHECK RECIRCULATION LINE
Check recirculation line between filler neck tube and fuel tank for clogging, kink, cracks, looseness and
improper connection.
OK or NG
OK
>> GO TO 23.
NG
>> Repair or replace hose, tube or filler neck tube.
23.
CHECK REFUELING EVAP VAPOR CUT VALVE
EC-477, "Component Inspection"
OK or NG
OK
>> GO TO 24.
NG
>> Replace refueling EVAP vapor cut valve with fuel tank.
EC-340
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P0456 EVAP CONTROL SYSTEM
24.
CHECK FUEL LEVEL SENSOR
MWI-38, "Component Inspection"
.
OK or NG
OK
>> GO TO 25.
NG
>> Replace fuel level sensor unit.
25.
CHECK INTERMITTENT INCIDENT
GI-39, "How to Check Terminal"
and
GI-42, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000009886745
FUEL TANK VACUUM RELIEF VALVE (BUILT INTO FUEL FILLER CAP)
1. Wipe clean valve housing.
2. Check valve opening pressure and vacuum.
3. If out of specification, replace fuel filler cap as an assembly.
CAUTION:
Use only a genuine fuel filler cap as a replacement. If an incor-
rect fuel filler cap is used, the MIL may come on.
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.
SEF445Y
Pressure: 15.3 - 20.0 kPa (0.156 - 0.204 kg/cm
2
, 2.22 -
2.90 psi)
Vacuum:
−6.0 to −3.3 kPa (−0.061 to −0.034 kg/cm
2
,
−0.87 to −0.48 psi)
SEF943S
PBIB3641E
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