2010 INFINITI QX56 Factory Service Manual

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Page 1585 of 4210

INFINITI QX56 2010 Factory Service Manual EC-232
< COMPONENT DIAGNOSIS >[VK56DE]
P0444, P0445 EVAP CANISTER P
URGE VOLUME CONTROL SOLENOID
VALVE
DTC Confirmation Procedure
INFOID:0000000005149249
NOTE:
If DTC Confirmation Procedure has been

Page 1586 of 4210

INFINITI QX56 2010 Factory Service Manual P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE
EC-233
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
4. Also check harness for short to ground and short to power.
OK

Page 1587 of 4210

INFINITI QX56 2010 Factory Service Manual EC-234
< COMPONENT DIAGNOSIS >[VK56DE]
P0447 EVAP CANISTER VENT CONTROL VALVE
P0447 EVAP CANISTER VENT CONTROL VALVE
Component DescriptionINFOID:0000000005149252
The EVAP canister vent control
valve

Page 1588 of 4210

INFINITI QX56 2010 Factory Service Manual P0447 EVAP CANISTER VENT CONTROL VALVEEC-235
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
2.CHECK EVAP CANISTER VENT CONTROL VALVE CIRCUIT
With CONSULT-III
1. Turn ignition switc

Page 1589 of 4210

INFINITI QX56 2010 Factory Service Manual EC-236
< COMPONENT DIAGNOSIS >[VK56DE]
P0447 EVAP CANISTER VENT CONTROL VALVE
Check the following.
• Harness connectors E41, C1
• Harness for open or short between EVAP canister vent control valve

Page 1590 of 4210

INFINITI QX56 2010 Factory Service Manual P0447 EVAP CANISTER VENT CONTROL VALVEEC-237
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
1. Remove EVAP canister vent c
ontrol valve from EVAP canister.
2. Check portion B of EVA

Page 1591 of 4210

INFINITI QX56 2010 Factory Service Manual EC-238
< COMPONENT DIAGNOSIS >[VK56DE]
P0448 EVAP CANISTER VENT CONTROL VALVE
P0448 EVAP CANISTER VENT CONTROL VALVE
Component DescriptionINFOID:0000000005149257
The EVAP canister vent control
valve

EC-238
< COMPONENT DIAGNOSIS >[VK56DE]
P0448 EVAP CANISTER VENT CONTROL VALVE
P0448 EVAP CANISTER VENT CONTROL VALVE
Component DescriptionINFOID:0000000005149257
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 Diagn osis LogicINFOID:0000000005149258
DTC Confirmation ProcedureINFOID:0000000005149259
1. If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next step.
a. Turn ignition switch OFF and wait at least 10 seconds.
b. Turn ignition switch ON.
c. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON and wait at least 5 seconds.
3. Turn ignition switch OFF and wait at least 10 seconds.
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-239, "
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: April 20092010 QX56

Page 1592 of 4210

INFINITI QX56 2010 Factory Service Manual P0448 EVAP CANISTER VENT CONTROL VALVEEC-239
< COMPONENT DIAGNOSIS > [VK56DE]
C
D
E
F
G H
I
J
K L
M A
EC
NP
O
a. Quickly increase the engine speed up to 4,000 to 4,500 rpm or more and keep it for 25 t

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