Infiniti I35 (A33). Manual — part 315
On Board Diagnosis Logic
NHEC1126
DTC No.
Trouble diagnosis
name
DTC Detecting Condition
Possible Cause
P1491
1491
Vacuum cut valve
bypass valve
Vacuum cut valve bypass valve does not operate
properly.
I
Vacuum cut valve bypass valve
I
Vacuum cut valve
I
Bypass hoses for clogging
I
EVAP control system pressure sensor
and circuit
I
EVAP canister vent control valve
I
Hose between fuel tank and vacuum
cut valve clogged
I
Hose between vacuum cut valve and
EVAP canister clogged
I
EVAP canister
I
EVAP purge port of fuel tank for clog-
ging
SEF210Y
SEF211Y
SEF239Y
DTC Confirmation Procedure
NHEC1127
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.
TESTING CONDITION:
For best results, perform test at a temperature of 5 to 30°C (41
to 86°F).
WITH CONSULT-II
NHEC1127S01
1)
Turn ignition switch ON.
2)
Start engine and warm it up to normal operating temperature.
3)
Turn ignition switch OFF and wait at least 10 seconds.
4)
Start engine and let it idle for at least 70 seconds.
5)
Select “VC CUT/V BP/V P1491” of “EVAPORATIVE SYSTEM”
in “DTC WORK SUPPORT” mode with CONSULT-II.
6)
Touch “START”.
7)
When the following conditions are met, “TESTING” will be dis-
played on the CONSULT-II screen. Maintain the conditions
continuously until “TESTING” changes to “COMPLETED”. (It
will take at least 30 seconds.)
ENG SPEED
Idle speed or more
Selector lever
Suitable position
Vehicle speed
35 - 120 km/h (22 - 75 MPH) or more
B/FUEL SCHDL
1.3 - 8.1 msec
If “TESTING” is not displayed after 5 minutes, retry from
step 3.
8)
Make sure that “OK” is displayed after touching “SELF-DIAG
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
On Board Diagnosis Logic
EC-601
RESULTS”.
If
“NG”
is
displayed,
refer
to
“Diagnostic
Procedure”, EC-604.
SEF530Q
Overall Function Check
NHEC1128
Use this procedure to check the overall function of vacuum cut
valve bypass valve. During this check, the 1st trip DTC might not
be confirmed.
WITH GST
NHEC1128S01
1)
Remove vacuum cut valve and vacuum cut valve bypass valve
as an assembly.
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)
Supply battery voltage to the terminal.
6)
Blow air in port A and check that air flows freely out of port B.
7)
Blow air in port B and check that air flows freely out of port A.
8)
If NG, go to “Diagnostic Procedure”, EC-604.
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
DTC Confirmation Procedure (Cont’d)
EC-602
Wiring Diagram
NHEC1129
MEC562D
SEF634XD
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
Wiring Diagram
EC-603
Diagnostic Procedure
NHEC1130
1
INSPECTION START
Do you have CONSULT-II?
Yes or No
Yes
©
GO TO 2.
No
©
GO TO 3.
2
CHECK VACUUM CUT VALVE BYPASS VALVE OPERATION
With 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. Turn ignition switch ON.
7. Select “VC/V BYPASS/V” in “ACTIVE TEST” mode with CONSULT-II and touch “ON”.
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.
SEC157D
OK or NG
OK
©
GO TO 4.
NG
©
GO TO 5.
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
Diagnostic Procedure
EC-604
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