Infiniti I30 (A33). Manual — part 318
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.
SEF914U
OK or NG
OK
©
GO TO 4.
NG
©
GO TO 7.
4
CHECK EVAP PURGE LINE
Check EVAP purge line between EVAP canister and fuel tank for clogging or disconnection.
OK or NG
OK
©
GO TO 5.
NG
©
Repair it.
5
CHECK EVAP PURGE PORT
Check EVAP purge port of fuel tank for clogging.
OK or NG
OK
©
GO TO 6.
NG
©
Clean EVAP purge port.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
Diagnostic Procedure (Cont’d)
EC-587
6
CHECK EVAP CANISTER
1. Pinch the fresh air hose.
2. Blow air into port A and check that it flows freely out of port B.
AEC630A
OK or NG
OK
©
GO TO 12.
NG
©
Replace EVAP canister.
7
CHECK BYPASS HOSE
Check bypass hoses for clogging.
OK or NG
OK
©
GO TO 8.
NG
©
Repair or replace hoses.
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
Diagnostic Procedure (Cont’d)
EC-588
8
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.
SEF016Z
Without CONSULT-II
Check air passage continuity and operation delay time under the following conditions.
SEF358X
OK or NG
OK
©
GO TO 9.
NG
©
Replace vacuum cut valve bypass valve.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
Diagnostic Procedure (Cont’d)
EC-589
9
CHECK VACUUM CUT VALVE
Check vacuum cut valve as follows:
SEF379Q
a. Plug port C and D with fingers.
b. Apply vacuum to port A and check that there is no suction from port B.
c. Apply vacuum to port B and check that there is suction from port A.
d. Blow air in port B and check that there is a resistance to flow out of port A.
e. Open port C and D.
f. Blow air in port A check that air flows freely out of port C.
g. Blow air in port B check that air flows freely out of port D.
OK or NG
OK
©
GO TO 10.
NG
©
Replace vacuum cut valve.
10
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 11.
NG
©
Repair or replace.
11
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR
1. Disconnect EVAP control system pressure sensor harness connector.
SEF268X
2. Check connectors for water.
Water should not exist.
OK or NG
OK
©
GO TO 12.
NG
©
Replace EVAP control system pressure sensor.
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
Diagnostic Procedure (Cont’d)
EC-590
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