Infiniti Q45. Manual — part 448
DTC P0448 EVAP CANISTER VENT CONTROL VALVE
EC-431
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EC
DTC Confirmation Procedure
NBS0022Z
CAUTION:
Always drive vehicle at a safe speed.
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.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Start engine.
4.
Drive vehicle at a speed of approximately 80 km/h (50 MPH) for
a maximum of 15 minutes.
NOTE:
If a malfunction exists, NG result may be displayed quicker.
5.
If 1st trip DTC is detected, go to
EC-433, "Diagnostic Procedure"
.
WITH GST
Follow the procedure WITH CONSULT-II above.
PBIB1917E
EC-432
DTC P0448 EVAP CANISTER VENT CONTROL VALVE
Wiring Diagram
NBS00230
TBWM1233E
DTC P0448 EVAP CANISTER VENT CONTROL VALVE
EC-433
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EC
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
NBS00231
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 WATER SEPARATOR
Refer to
EC-403, "Component Inspection"
OK or NG
OK
>> GO TO 3.
NG
>> Clean or replace water separator.
3.
CHECK EVAP CANISTER VENT CONTROL VALVE
Refer to
EC-435, "Component Inspection"
OK or NG
OK
>> GO TO 4.
NG
>> Replace EVAP canister vent control valve.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
111
W/B
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
L/Y
EVAP canister vent control
valve
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
119
120
R
R
Power supply for ECM
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
PBIB0026E
EC-434
DTC P0448 EVAP CANISTER VENT CONTROL VALVE
4.
CHECK IF EVAP CANISTER SATURATED WITH WATER
1.
Remove EVAP canister with EVAP canister vent control valve attached.
2.
Does water drain from the EVAP canister.
Yes or No
Yes
>> GO TO 5.
No
>> GO TO 7.
5.
CHECK EVAP CANISTER
Weigh the EVAP canister with the EVAP canister vent control valve attached.
The weight should be less than 1.8 kg (4.0 lb).
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 6.
6.
DETECT MALFUNCTIONING PART
Check the following.
●
EVAP canister for damage
●
EVAP hose between EVAP canister and water separator for clogging or poor connection
>> Repair hose or replace EVAP canister.
7.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR
1.
Disconnect EVAP control system pressure sensor harness connector.
2.
Check connectors for water.
OK or NG
OK
>> GO TO 8.
NG
>> Replace EVAP control system pressure sensor.
8.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to
EC-450, "Component Inspection"
OK or NG
OK
>> GO TO 9.
NG
>> Replace EVAP control system pressure sensor.
9.
CHECK INTERMITTENT INCIDENT
Refer to
EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END
SEF596U
Water should not exist.
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