Infiniti QX4 (R50). Manual — part 271
13
CHECK IF EVAP CANISTER SATURATED WITH WATER
1. Remove EVAP canister with EVAP canister vent control valve attached.
2. Check if water will drain from the EVAP canister.
SEF596U
Yes or No
Yes
©
GO TO 14.
No
©
GO TO 17.
14
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 16.
NG
©
GO TO 15.
15
DETECT MALFUNCTIONING PART
Check the following.
I
EVAP canister for damage
I
EVAP hose between EVAP canister and water separater for clogging or poor connection
©
Repair hose or replace EVAP canister.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1444 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Diagnostic Procedure (Cont’d)
EC-551
16
CHECK WATER SEPARATOR
1. Check visually for insect nests in the water separator air inlet.
2. Check visually for cracks or flaws in the appearance.
3. Check visually for cracks or flaws in the hose.
4. Check that A and C are not clogged by blowing air into B with A, and then C plugged.
SEF829T
5. In case of NG in items 2 - 4, replace the parts.
NOTE:
I
Do not disassemble water separator.
OK or NG
OK
©
GO TO 17.
NG
©
Clean or replace water separator.
17
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-140.
©
INSPECTION END
DTC P1444 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Diagnostic Procedure (Cont’d)
EC-552
SEF032W
SEF143S
Component Description
NBEC0326
The EVAP canister vent control valve is located on the EVAP can-
ister 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 ener-
gized. A plunger will then move to seal the canister vent. The abil-
ity 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
evaporative emission control system is depressurized and allows
“EVAP Control System (Small Leak)” diagnosis.
CONSULT-II Reference Value in Data Monitor
Mode
NBEC0327
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
VENT CONT/V
I
Ignition switch: ON
OFF
ECM Terminals and Reference Value
NBEC0679
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.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
40
G/Y
EVAP canister vent
control valve
[Ignition switch “ON”]
BATTERY VOLTAGE
(11 - 14V)
On Board Diagnosis Logic
NBEC0329
Malfunction is detected when EVAP canister vent control valve
remains closed under specified driving conditions.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1446 EVAPORATIVE EMISSION (EVAP) CANISTER VENT CONTROL
VALVE (CLOSE)
Component Description
EC-553
Possible Cause
NBEC0589
I
EVAP canister vent control valve
I
EVAP control system pressure sensor and the circuit
I
Blocked rubber tube to EVAP canister vent control valve
I
Water separator
I
EVAP canister is saturated with water.
SEF201Y
DTC Confirmation Procedure
NBEC0330
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
NBEC0330S01
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 “Diagnostic Procedure”,
EC-556.
WITH GST
NBEC0330S02
Follow the procedure “WITH CONSULT-II” above.
DTC P1446 EVAPORATIVE EMISSION (EVAP) CANISTER VENT CONTROL
VALVE (CLOSE)
Possible Cause
EC-554
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