Nissan Frontier D22. Manual — part 345
DTC P1448 EVAP CANISTER VENT CONTROL VALVE
EC-483
[KA24DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
11. Make sure of the following.
If the result is NG, go to
EC-483, "Diagnostic Procedure"
If the result is OK, go to “Diagnostic Procedure” for DTC P0442,
Overall Function Check
UBS00DBP
Use this procedure to check the overall function of the EVAP canister vent control valve circuit. During this
check, a 1st trip DTC might not be confirmed.
WITH GST
1.
Disconnect hose from water separator.
2.
Disconnect EVAP canister vent control valve harness connector.
3.
Verify the following.
If the result is NG, go to
EC-483, "Diagnostic Procedure"
If the result is OK, perform trouble diagnosis for DTC P0442.
Refer to
Diagnostic Procedure
UBS00DBQ
1.
CHECK RUBBER TUBE
1.
Turn ignition switch OFF.
2.
Check disconnection or obstruction of rubber tube connected to EVAP canister vent control valve.
OK or NG
OK
>> GO TO 2.
NG
>> Repair or clean rubber tube.
2.
CHECK EVAP CANISTER VENT CONTROL VALVE-I
1.
Remove EVAP canister vent control valve from EVAP canister.
2.
Check portion B of EVAP canister vent control valve for being
rusted.
OK or NG
OK
>> GO TO 3.
NG
>> Replace EVAP canister vent control valve.
Condition
Air passage continuity between A and
B
Touching “ON”
No
Touching “OFF”
Yes
SEF805Y
Condition
Air passage continuity
12V direct current supply between ter-
minals 1 and 2
No
No supply
Yes
BBIA0309E
BBIA0308E
EC-484
[KA24DE]
DTC P1448 EVAP CANISTER VENT CONTROL VALVE
3.
CHECK EVAP CANISTER VENT CONTROL VALVE-II
With CONSULT-II
1.
Reconnect harness connectors disconnected.
2.
Turn ignition switch “ON”.
3.
Perform “VENT CONTROL/V” in “ACTIVE TEST” mode.
4.
Check air passage continuity and operation delay time.
Without CONSULT-II
Check air passage continuity and operation delay time under the fol-
lowing condition.
Operation takes less than 1 second.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.
4.
CHECK EVAP CANISTER VENT CONTROL VALVE-III
1.
Clean the air passage (Portion A to B ) of EVAP canister vent control valve using an air blower.
2.
Perform Test No. 3 again.
OK or NG
OK
>> GO TO 5.
NG
>> Replace EVAP canister vent control valve.
Condition
Air passage continuity between
A and B
12V direct current supply between
terminals 1 and 2
No
OFF
Yes
SEF991Y
BBIA0309E
DTC P1448 EVAP CANISTER VENT CONTROL VALVE
EC-485
[KA24DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
5.
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 6.
NG
>> Replace vacuum cut valve.
6.
CHECK IF EVAP CANISTER IS SATURATED WITH WATER
1.
Remove EVAP canister with the vent control valve attached.
2.
Check if water will drain from the EVAP canister.
Yes or No
Yes
>> GO TO 9.
No
>> GO TO 7.
7.
CHECK EVAP CANISTER
Weigh the EVAP canister with EVAP canister vent control valve attached.
The weight should be less than 1.8 kg (4.0lb).
OK or NG
OK
>> GO TO 9.
NG
>> GO TO 8.
SEF186S
SEF379Q
SEF596U
EC-486
[KA24DE]
DTC P1448 EVAP CANISTER VENT CONTROL VALVE
8.
DETECT MALFUNCTIONING PART
Check the following.
1.
Visually check the EVAP canister for damage.
2.
Check hose connection between EVAP canister and water separator for clogging and poor connection.
3.
Check water separator.
–
Check visually for insect nests in the water separator air inlet.
–
Check visually for cracks or flaws in the appearance.
–
Check visually for cracks or flaws in the hose.
–
Check that A and C are not clogged by blowing air into B with
A , and then C plugged.
–
In case of NG in items 2 - 4, replace the parts.
–
Do not disassemble water separator.
>> Repair hose or replace EVAP canister or water separa-
tor.
9.
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 10.
NG
>> Install hose property or replace it.
10.
CHECK HARNESS CONNECTOR
1.
Disconnect EVAP control system pressure sensor harness connector.
2.
Check harness connector for water.
Water should not exist.
OK or NG
OK
>> GO TO 11.
NG
>> Replace EVAP control system pressure sensor.
11.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Perform “DTC Confirmation Procedure”, for DTC P0452,
OK or NG
OK
>> GO TO 12.
NG
>> Replace EVAP control system pressure sensor and repair or replace harness and connector.
12.
CHECK INTERMITTENT INCIDENT
EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END
PBIB1032E
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