2010 INFINITI QX56 Factory Service Manual

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Page 1569 of 4210

INFINITI QX56 2010 Factory Service Manual EC-216
< COMPONENT DIAGNOSIS >[VK56DE]
P0441 EVAP CONTROL SYSTEM
1. Disconnect purge hoses connected to EVAP service port
A and
EVAP canister purge volume control solenoid valve B.
2. Blow air into

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INFINITI QX56 2010 Factory Service Manual P0441 EVAP CONTROL SYSTEMEC-217
< COMPONENT DIAGNOSIS > [VK56DE]
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2. Check the rubber tube for clogging.
OK or NG
OK >> GO TO 11.
NG >> Clean the rubber tube using an ai

Page 1571 of 4210

INFINITI QX56 2010 Factory Service Manual EC-218
< COMPONENT DIAGNOSIS >[VK56DE]
P0442 EVAP CONTROL SYSTEM
P0442 EVAP CONTROL SYSTEM
On Board Diagn
osis LogicINFOID:0000000005149238
This diagnosis detects leaks in the EVAP purge line using en

EC-218
< COMPONENT DIAGNOSIS >[VK56DE]
P0442 EVAP CONTROL SYSTEM
P0442 EVAP CONTROL SYSTEM
On Board Diagn
osis LogicINFOID:0000000005149238
This diagnosis detects leaks in the EVAP purge line using engine intake manifold vacuum.
If pressure does not increase, the ECM will check for leaks in the line between the fuel tank and EVAP canister
purge volume control solenoid valve, under the following “Vacuum test” conditions.
The EVAP canister vent control valve is closed to shut the EVAP purge line off. The EVAP canister purge vol-
ume control solenoid valve will then be opened to depressurize the EVAP purge line using intake manifold
vacuum. After this occurs, the EVAP canister purge volume control solenoid valve will be closed.
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 Confirmation ProcedureINFOID:0000000005149239
NOTE:
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0442
0442 EVAP control system
small leak detected
(negative pressure) EVAP control system has a leak, EVAP
control 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 missing or damaged
• EVAP canister is saturated with water
• EVAP control system pressure sensor
• Fuel level sensor and the circuit
• Refueling EVAP vapor cut valve
• ORVR system leaks
PBIB1026E
Revision: April 20092010 QX56

Page 1572 of 4210

INFINITI QX56 2010 Factory Service Manual P0442 EVAP CONTROL SYSTEMEC-219
< COMPONENT DIAGNOSIS > [VK56DE]
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• If DTC Confirmation Procedure has been previously conducted, always perform the following procedure

P0442 EVAP CONTROL SYSTEMEC-219
< COMPONENT DIAGNOSIS > [VK56DE]
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• If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting 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.
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.
• Always perform test at a temperature of 0 to 30 °C (32 to 86 °F).
WITH CONSULT-III
1. Turn ignition switch ON.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-III.
4. Make sure that the following conditions are met.
COOLAN TEMP/S: 0 - 70 °C (32 - 158° F)
INT/A TEMP SE: 0 - 30 °C (32 - 86° F)
5. 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".
6. Make sure that “OK” is displayed. If “NG” is displayed, refer to EC-219, "
Diagnosis Procedure".
NOTE:
Make sure that EVAP hoses are connected to EVAP canister purge volume control solenoid valve
properly.
WITH GST
NOTE:
Be sure to read the explanation of EC-459, "
DTC Index" before driving vehicle.
1. Start engine.
2. Drive vehicle according to EC-459, "
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 P0442 is displayed on the screen, go to EC-219, "
Diagnosis Procedure".
- If P0441 is displayed on the screen, go to EC-214, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000005149240
1.CHECK FUEL FILLER CAP DESIGN
1. Turn ignition switch OFF.
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 FUEL FILLER CAP INSTALLATION
Check that the cap is tightened properly by rotating the cap clockwise.
SEF915U
Revision: April 20092010 QX56

Page 1573 of 4210

INFINITI QX56 2010 Factory Service Manual EC-220
< COMPONENT DIAGNOSIS >[VK56DE]
P0442 EVAP CONTROL SYSTEM
OK or NG
OK >> GO TO 3.
NG >> 1. Open fuel filler cap, then clean cap and
fuel filler neck threads using air blower.
2. Retighten unti

Page 1574 of 4210

INFINITI QX56 2010 Factory Service Manual P0442 EVAP CONTROL SYSTEMEC-221
< COMPONENT DIAGNOSIS > [VK56DE]
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4. Using EVAP leak detector, locate the EVAP leak. For the leak
detector, refer to the instruction manu

Page 1575 of 4210

INFINITI QX56 2010 Factory Service Manual EC-222
< COMPONENT DIAGNOSIS >[VK56DE]
P0442 EVAP CONTROL SYSTEM
2. Does water drain from the EVAP canister?
Ye s o r N o
Yes >> GO TO 10.
No (With CONSULT-III)>>GO TO 12.
No (Without CONSULT-III)>>

Page 1576 of 4210

INFINITI QX56 2010 Factory Service Manual P0442 EVAP CONTROL SYSTEMEC-223
< COMPONENT DIAGNOSIS > [VK56DE]
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OK >> GO TO 15.
NG >> Repair or reconnect the hose.
15.CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOI

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