Infiniti G35 (V35). Manual — part 388
DTC P0448 EVAP CANISTER VENT CONTROL VALVE
EC-433
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DTC P0448 EVAP CANISTER VENT CONTROL VALVE
PFP:16935
Component Description
NBS000ZJ
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.
CONSULT-II Reference Value in Data Monitor Mode
NBS000ZK
Specification data are reference values.
On Board Diagnosis Logic
NBS000ZL
PBIB1263E
PBIB1086E
MONITOR ITEM
CONDITION
SPECIFICATION
VENT CONT/V
●
Ignition switch: ON
OFF
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
EC-434
DTC P0448 EVAP CANISTER VENT CONTROL VALVE
DTC Confirmation Procedure
NBS000ZM
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-II
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-II.
4.
Start engine and let it idle for at least 1 minute.
5.
Repeat next procedures three 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 minutes.
Never exceed 3 minutes.
b.
Fully released accelerator pedal and keep engine idle for about
5 seconds.
6.
If 1st trip DTC is detected, go to
EC-436, "Diagnostic Procedure"
.
If 1st trip DTC is not detected, go to the next step.
7.
Repeat next procedure 20 times.
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 accelerator pedal and keep engine idle for at least 35 seconds.
8.
If 1st trip DTC is detected, go to
EC-436, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
SEF058Y
PBIB0972E
DTC P0448 EVAP CANISTER VENT CONTROL VALVE
EC-435
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Wiring Diagram
NBS000ZN
TBWM1119E
EC-436
DTC P0448 EVAP CANISTER VENT CONTROL VALVE
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
Diagnostic Procedure
NBS000ZO
1.
CHECK RUBBER TUBE
1.
Turn ignition switch OFF.
2.
Disconnect rubber tube connected to EVAP canister vent control valve.
3.
Check the rubber tube for clogging.
OK or NG
OK
>> GO TO 2.
NG
>> Clean rubber tube using an air blower.
2.
CHECK EVAP CANISTER VENT CONTROL VALVE
Refer to
EC-438, "EVAP CANISTER VENT CONTROL VALVE"
OK or NG
OK
>> GO TO 3.
NG
>> Replace EVAP canister vent control valve.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
111
W
ECM relay
(Self shut-off)
[Engine is running]
[Ignition switch: OFF]
●
For a few seconds after turning ignition
switch OFF
0 - 1.5V
[Ignition switch: OFF]
●
More than a few seconds after turning igni-
tion switch OFF
BATTERY VOLTAGE
(11 - 14V)
117
GY/L
EVAP canister vent control
valve
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
119
120
P
L
Power supply for ECM
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
PBIB1086E
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