2008 INFINITI QX56 Factory Service Manual

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Page 1537 of 4083

INFINITI QX56 2008 Factory Service Manual EC-238
< COMPONENT DIAGNOSIS >[VK56DE]
P0444, P0445 EVAP CANISTER P
URGE VOLUME CONTROL SOLENOID
VALVE
4. Also check harness for short to ground and short to power.
OK or NG
OK (With CONSULT-III)>>GO

Page 1538 of 4083

INFINITI QX56 2008 Factory Service Manual P0447 EVAP CANISTER VENT CONTROL VALVEEC-239
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
P0447 EVAP CANISTER VENT CONTROL VALVE
Component DescriptionINFOID:0000000001351596
The EV

Page 1539 of 4083

INFINITI QX56 2008 Factory Service Manual EC-240
< COMPONENT DIAGNOSIS >[VK56DE]
P0447 EVAP CANISTER VENT CONTROL VALVE
2.CHECK EVAP CANISTER VE
NT CONTROL VALVE CIRCUIT
With CONSULT-III
1. Turn ignition switch OFF and then turn ON.
2. Sele

Page 1540 of 4083

INFINITI QX56 2008 Factory Service Manual P0447 EVAP CANISTER VENT CONTROL VALVEEC-241
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
Check the following.
• Harness connectors E41, C1
• Harness for open or short between

Page 1541 of 4083

INFINITI QX56 2008 Factory Service Manual EC-242
< COMPONENT DIAGNOSIS >[VK56DE]
P0447 EVAP CANISTER VENT CONTROL VALVE
1. Remove EVAP canister vent control valve from EVAP canister.
2. Check portion
B of EVAP canister vent control valve for

Page 1542 of 4083

INFINITI QX56 2008 Factory Service Manual P0448 EVAP CANISTER VENT CONTROL VALVEEC-243
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
P0448 EVAP CANISTER VENT CONTROL VALVE
Component DescriptionINFOID:0000000001351603
The EV

P0448 EVAP CANISTER VENT CONTROL VALVEEC-243
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
P0448 EVAP CANISTER VENT CONTROL VALVE
Component DescriptionINFOID:0000000001351603
The EVAP canister vent control valve is located on the EVAP canis-
ter and is used to seal the canister vent.
This solenoid valve responds to signals from the ECM. When the
ECM sends an ON signal, the coil in the solenoid valve is energized.
A plunger will then move to seal the
canister vent. The ability to seal
the vent is necessary for the on board diagnosis of other evaporative
emission control system components.
This solenoid valve is used only for diagnosis, and usually remains
opened.
When the vent is closed, under normal purge conditions, the evapo-
rative emission control system is depressurized and allows EVAP
Control System diagnosis.
On Board Diagnosis LogicINFOID:0000000001351605
DTC Confirmation ProcedureINFOID:0000000001351606
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
WITH CONSULT-III
1. Turn ignition switch ON and wait at least 5 seconds.
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. Start engine and let it idle for at least 1 minute.
5. Repeat next procedures 3 times.
a. Increase the engine speed up to 3,000 to 3,500 rpm and keep it for 2 minutes and 50 seconds to 3 min- utes.
Never exceed 3 minutes.
b. Fully released accelerator pedal and keep engine idle for about 5 seconds.
6. Check 1st trip DTC.
7. If 1st trip DTC is detected, go to EC-244, "
Diagnosis Procedure".
If 1st trip DTC is not detected, go to the next step.
8. Repeat next procedure 20 times.
PBIB1263E
BBIA0443E
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0448
0448 EVAP canister vent con-
trol valve close EVAP canister vent control valve remains
closed under specified driving conditions. • EVAP canister vent control valve
• EVAP control system pressure sensor
and the circuit
• Blocked rubber tube to EVAP canister
vent control valve
• EVAP canister is saturated with water
Revision: March 2010 2008 QX56

Page 1543 of 4083

INFINITI QX56 2008 Factory Service Manual EC-244
< COMPONENT DIAGNOSIS >[VK56DE]
P0448 EVAP CANISTER VENT CONTROL VALVE
a. Quickly increase the engine speed up to 4,000 to 4,500 rpm or more and keep it for 25 to 30 seconds.
b. Fully released

Page 1544 of 4083

INFINITI QX56 2008 Factory Service Manual P0448 EVAP CANISTER VENT CONTROL VALVEEC-245
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
4.CHECK EVAP CANISTER
Weigh the EVAP canister with the EVAP canister vent control valve an

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