Infiniti FX35, FX50 (S51). Manual — part 697
P0455 EVAP CONTROL SYSTEM
EC-329
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
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8.
CHECK FOR EVAP LEAK
.
Is there any leak in EVAP line?
YES
>> Repair or replace malfunctioning part.
NO-1
>> With CONSULT-III: GO TO 9.
NO-2
>> Without CONSULT-III: GO TO 10.
9.
CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION
With CONSULT-III
1.
Disconnect vacuum hose connected to EVAP canister purge volume control solenoid valve at EVAP ser-
vice port.
2.
Start engine and let it idle.
3.
Select “PURG VOL CONT/V” in “ACTIVE TEST” mode.
4.
Touch “Qu” on CONSULT-III screen to increase “PURG VOL CONT/V” opening to 100%.
5.
Check vacuum hose for vacuum.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> GO TO 11.
10.
CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION
Without CONSULT-III
1.
Start engine and warm it up to normal operating temperature.
2.
Stop engine.
3.
Disconnect vacuum hose connected to EVAP canister purge volume control solenoid valve at EVAP ser-
vice 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.
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> GO TO 11.
11.
CHECK VACUUM HOSE
Check vacuum hoses for clogging or disconnection. Refer to
Is the inspection result normal?
YES-1 >> With CONSULT-III: GO TO 12.
YES-2 >> Without CONSULT-III: GO TO 13.
NO
>> Repair or reconnect the hose.
12.
CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
With CONSULT-III
1.
Start engine.
2.
Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT-III. Check that engine speed var-
ies according to the valve opening.
Does engine speed vary according to the valve opening?
YES
>> GO TO 14.
NO
>> GO TO 13.
13.
CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
EC-299, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 14.
NO
>> Replace EVAP canister purge volume control solenoid valve.
Vacuum should exist.
Vacuum should exist.
EC-330
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
P0455 EVAP CONTROL SYSTEM
14.
CHECK FUEL TANK TEMPERATURE SENSOR
EC-245, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 15.
NO
>> Replace “fuel level sensor unit and fuel pump”.
15.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-313, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 16.
NO
>> Replace EVAP control system pressure sensor.
16.
CHECK EVAP/ORVR LINE
Check EVAP/ORVR line between EVAP canister and fuel tank for clogging, kinks, looseness and improper
connection. For location, refer to
.
Is the inspection result normal?
YES
>> GO TO 17.
NO
>> Repair or replace hoses and tubes.
17.
CHECK RECIRCULATION LINE
Check recirculation line between filler neck tube and fuel tank for clogging, kinks, cracks, looseness and
improper connection.
Is the inspection result normal?
YES
>> GO TO 18.
NO
>> Repair or replace hose, tube or filler neck tube.
18.
CHECK REFUELING EVAP VAPOR CUT VALVE
EC-490, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 19.
NO
>> Replace refueling EVAP vapor cut valve with fuel tank.
19.
CHECK INTERMITTENT INCIDENT
GI-36, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000005236912
1.
CHECK FUEL FILLER CAP
1.
Turn ignition switch OFF.
2.
Remove fuel filler cap.
3.
Wipe clean valve housing.
SEF445Y
P0455 EVAP CONTROL SYSTEM
EC-331
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
C
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4.
Install fuel filler cap adapter (commercial service tool) to fuel
filler cap.
5.
Check valve opening pressure and vacuum.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
REPLACE FUEL FILLER CAP
Replace fuel filler cap.
CAUTION:
Use only a genuine fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the MIL may
illuminate.
>> INSPECTION END
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
EC-332
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
P0456 EVAP CONTROL SYSTEM
P0456 EVAP CONTROL SYSTEM
DTC Logic
INFOID:0000000005236913
DTC DETECTION LOGIC
NOTE:
If DTC P0456 is displayed with DTC P0442, first perform the trouble diagnosis for DTC P0456.
This diagnosis detects very small leaks in the EVAP line between fuel tank and EVAP canister purge volume
control solenoid valve, using the intake manifold vacuum in the same way as conventional EVAP small leak
diagnosis.
If ECM judges a leak which corresponds to a very small leak, the very small leak P0456 will be detected.
If ECM judges a leak equivalent to a small leak, EVAP small leak P0442 will be detected.
If ECM judges that there are no leaks, the diagnosis will be OK.
CAUTION:
• Use only a genuine NISSAN fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the
MIL may illuminate.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0456
Evaporative emission
control system very
small leak (negative
pressure check)
• EVAP system has a very small leak.
• EVAP system does not operate prop-
erly.
• Incorrect fuel tank vacuum relief valve
• Incorrect fuel filler cap used
• Fuel filler cap remains open or does not close.
• Foreign matter caught in fuel filler cap.
• Leak is in line between intake manifold and EVAP
canister purge volume control solenoid valve.
• Foreign matter caught in EVAP canister vent con-
trol valve.
• EVAP canister or fuel tank leaks
• EVAP purge line (pipe and rubber tube) leaks
• EVAP purge line rubber tube bent
• Loose or disconnected rubber tube
• EVAP canister vent control valve and the circuit
• EVAP canister purge volume control solenoid
valve and the circuit
• Fuel tank temperature sensor
• O-ring of EVAP canister vent control valve is miss-
ing or damaged
• EVAP canister is saturated with water
• EVAP control system pressure sensor
• Refueling EVAP vapor cut valve
• ORVR system leaks
• Fuel level sensor and the circuit
• Foreign matter caught in EVAP canister purge vol-
ume control solenoid valve
PBIB1026E
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