2009 INFINITI QX56 Factory Service Manual

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Page 1577 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-250
< COMPONENT DIAGNOSIS >[VK56DE]
P0455 EVAP CONTROL SYSTEM
P0455 EVAP CONTROL SYSTEM
On Board Diagn
osis LogicINFOID:0000000003771520
This diagnosis detects a very large leak (fuel filler c ap

Page 1578 of 4171

INFINITI QX56 2009 Factory Service Manual
P0455 EVAP CONTROL SYSTEMEC-251
< COMPONENT DIAGNOSIS > [VK56DE]
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Make sure that EVAP hoses are connected to EVAP canister purge volume control solenoid valve
proper

P0455 EVAP CONTROL SYSTEMEC-251
< COMPONENT DIAGNOSIS > [VK56DE]
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Make sure that EVAP hoses are connected to EVAP canister purge volume control solenoid valve
properly.
If DTC Confirmation Procedure has been previously c onducted, always perform the following before con-
ducting the next step.
1. Turn ignition swich OFF and wait at least 10 seconds.
2. Turn ignition swich ON.
3. Turn ignition swich OFF and wait at least 10 seconds.
TESTING CONDITION:
Perform “DTC WORK SUPPORT” when the fuel level is between 1/4 and 3/4 full, and vehicle is placed
on flat level surface.
Open engine hood before conducting the following procedures.
WITH CONSULT-III
1. Tighten fuel filler cap securely until ratcheting sound is heard.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-III.
5. Make sure that the following conditions are met.
COOLAN TEMP/S: 0 - 70 °C (32 - 158 °F)
INT/A TEMP SE: 0 - 60 °C (32 - 140 °F)
6. Select “EVP SML LEAK P0442/P1442” of “EVAPO RATIVE SYSTEM” in “DTC WORK SUPPORT” mode
with CONSULT-III.
Follow the instruction displayed.
NOTE:
If the engine speed cannot be maintained within the range displayed on the CONSULT-III screen, go to
EC-13, "Basic Inspection"
.
7. Make sure that “OK” is displayed. If “NG” is displayed, select “SELF-DIAG R ESULTS” mode and make sure that “EVAP GROSS LEAK
[P0455]” is displayed. If it is displayed, refer to EC-251, "Diagnosis Procedure"
.
If P0442 is displayed, perform Diagnostic Procedure for DTC P0442, EC-216, "Diagnosis Procedure"
.
WITH GST
NOTE:
Be sure to read the explanation of EC-456, "DTC Index"
before driving vehicle.
1. Start engine.
2. Drive vehicle according to EC-456, "DTC Index"
.
3. Stop vehicle.
4. Turn ignition switch OFF, wait at least 10 seconds and then turn ON.
5. Select Service $07 with GST. If P0441 is displayed on the screen, go to EC-211, "Diagnosis Procedure"
.
If P0442 is displayed on the screen, go to EC-216, "Diagnosis Procedure"
.
If P0455 is displayed on the screen, go to EC-251, "Diagnosis Procedure"
.
Diagnosis ProcedureINFOID:0000000003771522
1.CHECK FUEL FILLER CAP DESIGN
1. Turn ignition switch OFF.
Revision: December 20092009 QX56

Page 1579 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-252
< COMPONENT DIAGNOSIS >[VK56DE]
P0455 EVAP CONTROL SYSTEM
2. Check for genuine NISSAN fuel filler cap design.
OK or NG
OK >> GO TO 2.
NG >> Replace with genuine NISSAN fuel filler cap.
2.CHECK

Page 1580 of 4171

INFINITI QX56 2009 Factory Service Manual
P0455 EVAP CONTROL SYSTEMEC-253
< COMPONENT DIAGNOSIS > [VK56DE]
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To locate the EVAP leak, install EVAP service port adapter and pres-
sure pump to EVAP service port se

Page 1581 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-254
< COMPONENT DIAGNOSIS >[VK56DE]
P0455 EVAP CONTROL SYSTEM
2. Apply 12 volts DC to EVAP canister vent control va
lve. The valve will close. (Continue to apply 12 volts
until the end of test.)
3

Page 1582 of 4171

INFINITI QX56 2009 Factory Service Manual
P0455 EVAP CONTROL SYSTEMEC-255
< COMPONENT DIAGNOSIS > [VK56DE]
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OK (With CONSULT-III)>>GO TO 14.
OK (Without CONSULT-III)>>GO TO 15.
NG >> Repair or reconnect the hos

Page 1583 of 4171

INFINITI QX56 2009 Factory Service Manual
EC-256
< COMPONENT DIAGNOSIS >[VK56DE]
P0455 EVAP CONTROL SYSTEM
Component Inspection
INFOID:0000000003771523
FUEL TANK VACUUM RELIEF VALVE (BUILT INTO FUEL FILLER CAP)
1. Wipe clean valve housing.
2

Page 1584 of 4171

INFINITI QX56 2009 Factory Service Manual
P0456 EVAP CONTROL SYSTEMEC-257
< COMPONENT DIAGNOSIS > [VK56DE]
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P0456 EVAP CONTROL SYSTEM
On Board Diagnosis LogicINFOID:0000000003771524
This diagnosis detects very

P0456 EVAP CONTROL SYSTEMEC-257
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P0456 EVAP CONTROL SYSTEM
On Board Diagnosis LogicINFOID:0000000003771524
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 vac uum 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 there are no leaks, the diagnosis will be OK.
CAUTION:
Use only a genuine NISSAN fuel filler cap as a replacemen t. If an incorrect fuel filler cap is used, the
MIL may come on.
If the fuel filler cap is not tigh tened properly, the MIL may come on.
Use only a genuine NISSAN rubber tube as a replacement.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0456
0456 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 fails to 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
Revision: December 20092009 QX56

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