Nissan Frontier D22. Manual — part 503
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
EC-1115
[VG33E]
C
D
E
F
G
H
I
J
K
L
M
A
EC
3.
CHECK VACUUM CUT VALVE BYPASS VALVE OPERATION
Without CONSULT-II
1.
Turn ignition switch OFF.
2.
Remove vacuum cut valve and vacuum cut valve bypass valve as an assembly.
3.
Apply vacuum to port A and check that there is no suction from
port B.
4.
Apply vacuum to port B and check that there is suction from port
A.
5.
Blow air in port B and check that there is a resistance to flow out
of port A.
6.
Disconnect vacuum cut valve bypass valve harness connector.
7.
Supply battery voltage to the terminal.
8.
Blow air in port A and check that air flows freely out of port B.
9.
Blow air in port B and check that air flows freely out of port A.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 5.
4.
CHECK EVAP PURGE LINE
1.
Check EVAP purge line between EVAP canister and fuel tank for clogging or disconnection.
2.
Check EVAP purge port of fuel tank for clogging.
3.
Check EVAP canister. Refer to
EC-1167, "Component Inspection"
.
OK or NG
OK
>> GO TO 8.
NG (Step 1)>>Repair it.
NG (Step 2)>>Clean EVAP purge port.
NG (Step 3)>>Replace EVAP canister.
5.
CHECK BYPASS HOSE
Check bypass hoses for clogging.
OK or NG
OK
>> GO TO 6.
NG
>> Repair or replace hoses.
PBIB0635E
EC-1116
[VG33E]
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
6.
CHECK VACUUM CUT VALVE BYPASS VALVE
With CONSULT-II
1.
Perform “VC/V BYPASS/V” in “ACTIVE TEST” mode.
2.
Check air passage continuity and operation delay time under the
following conditions.
Operation takes less than 1 second.
3.
Check air passage continuity and operation delay time under the
following conditions.
Without CONSULT-II
Operation takes less than 1 second.
OK or NG
OK
>> GO TO 7.
NG
>> Replace vacuum cut valve bypass valve.
7.
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 8.
NG
>> Replace vacuum cut valve.
SEF014Z
Condition
VC/V BYPASS/V
Air passage continuity between A and B
ON
Yes
OFF
No
PBIB1429E
Condition
Air passage continuity between A and B
12V direct current supply between ter-
minals 1 and 2
Yes
No supply
No
PBIB1430E
SEF379Q
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
EC-1117
[VG33E]
C
D
E
F
G
H
I
J
K
L
M
A
EC
8.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR HOSE
1.
Turn ignition switch OFF.
2.
Check disconnection or improper connection of hose connected to EVAP control system pressure sensor.
OK or NG
OK
>> GO TO 9.
NG
>> Repair or replace.
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.
10.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR FUNCTION
Refer to DTC P0452
EC-934, "DTC Confirmation Procedure"
or DTC P0453
EC-940, "DTC Confirmation Pro-
OK or NG
OK
>> GO TO 11.
NG
>> Replace EVAP control system pressure sensor.
AEC651A
EC-1118
[VG33E]
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
11.
CHECK EVAP CANISTER VENT CONTROL VALVE
Check air passage continuity.
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 conditions.
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 12.
NG
>> Replace EVAP canister vent control valve.
Condition
VENT CONTROL/V
Air passage continuity between A and B
ON
Yes
OFF
No
SEF013Z
Condition
Air passage continuity
between A and B
12V direct current supply between
terminals 1 and 2
No
OFF
Yes
BBIA0309E
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