Nissan Frontier D22. Manual — part 640
DTC P1448 EVAP CANISTER VENT CONTROL VALVE
EC-1663
[VG33ER]
C
D
E
F
G
H
I
J
K
L
M
A
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 the ECM terminals, such as the ground.
Diagnostic Procedure
UBS00E1I
1.
CHECK RUBBER TUBE
1.
Turn ignition switch OFF.
2.
Check obstructed rubber tube connected to EVAP canister vent
control valve.
OK or NG
OK
>> GO TO 2.
NG
>> Clean, repair or replace rubber tube.
2.
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.
5.
In case of NG in items 2 - 4, replace the parts.
NOTE:
●
Do not disassemble water separator.
OK or NG
OK
>> GO TO 3.
NG
>> Replace water separator.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
108
R/G
EVAP canister vent control
valve
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
SEF143S
PBIB1032E
EC-1664
[VG33ER]
DTC P1448 EVAP CANISTER VENT CONTROL VALVE
3.
CHECK EVAP CANISTER VENT CONTROL VALVE AND O-RING
With CONSULT-II
1.
Perform “VENT CONTROL/V” in “ACTIVE TEST” mode.
2.
Check air passage continuity and operation delay time.
Operation takes less than 1 second.
Without CONSULT-II
1.
Check air passage continuity and operation delay time under the
following condition.
Operation takes less than 1 second.
If NG or operation takes more than 1 second, clean valve using air
blower or replace as necessary.
If portion B is rusted, replace control valve.
Make sure new O-ring is installed properly.
OK or NG
OK
>> GO TO 4.
NG
>> Replace EVAP canister vent control valve and O-ring.
4.
CHECK VACUUM CUT VALVE
Check vacuum cut valve as follows:
1.
Plug port C and D with fingers.
2.
Apply vacuum to port A and check that there is no suction from
port B .
3.
Apply vacuum to port B and check that there is suction from
port A .
4.
Blow air in port B and check that there is a resistance to flow out
of port A .
5.
Open port C and D .
6.
Blow air in port A check that air flows freely out of port C .
7.
Blow air in port B check that air flows freely out of port D .
OK or NG
OK
>> GO TO 5.
NG
>> Replace vacuum cut valve.
Condition VENT CONTROL/V
Air passage continuity between
A and B
ON
No
OFF
Yes
SEF013Z
Condition
Air passage continuity between A
and B
12V direct current supply
between terminals 1 and 2
No
OFF
Yes
BBIA0309E
SEF379Q
DTC P1448 EVAP CANISTER VENT CONTROL VALVE
EC-1665
[VG33ER]
C
D
E
F
G
H
I
J
K
L
M
A
EC
5.
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.
OK or NG
OK >> GO
TO
6.
NG
>> GO TO 8.
6.
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 8.
NG
>> GO TO 7.
7.
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.
8.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR HOSE
Check disconnection or improper connection of hose connected to EVAP control system pressure sensor.
OK or NG
OK
>> GO TO 9.
NG
>> Repair it.
9.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR
1.
Disconnect EVAP control system pressure sensor harness con-
nector.
2.
Check connectors for water.
Water should not exist.
OK or NG
OK
>> GO TO 10.
NG
>> Replace EVAP control system pressure sensor.
SEF596U
AEC651A
EC-1666
[VG33ER]
DTC P1448 EVAP CANISTER VENT CONTROL VALVE
10.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR FUNCTION
EC-1524, "DTC Confirmation Procedure"
or DTC P0453
.
OK or NG
OK
>> GO TO 11.
NG
>> Replace EVAP control system pressure sensor.
11.
CHECK INTERMITTENT INCIDENT
EC-1297, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END.
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