Infiniti Q45. Manual — part 483
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
EC-571
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EC
On Board Diagnosis Logic
NBS0023P
DTC Confirmation Procedure
NBS0023Q
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:
●
Always perform test at a temperature of 5 to 30
°
C (41 to 86
°
F).
●
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
WITH CONSULT-II
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”.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1491
1491
Vacuum cut valve bypass
valve
Vacuum cut valve bypass valve dose not
operate properly.
●
Vacuum cut valve bypass valve
●
Vacuum cut valve
●
Bypass hoses for clogging
●
EVAP control system pressure sensor
and circuit
●
EVAP canister vent control valve
●
Hose between fuel tank and vacuum cut
valve clogged
●
Hose between vacuum cut valve and
EVAP canister clogged
●
EVAP canister
●
EVAP purge port of fuel tank for clogging
●
Refueling EVAP vapor cut valve
●
Refueling control valve
SEF210Y
EC-572
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
7.
When the following conditions are met, “TESTING” will be dis-
played on the CONSULT-II screen. Maintain the conditions con-
tinuously until “TESTING” changes to “COMPLETED”. (It will
take at least 30 seconds.)
If “TESTING” is not displayed after 5 minutes, retry from
step 3.
8.
Make sure that “OK” is displayed after touching “SELF-DIAG
RESULTS”. If “NG” is displayed, refer to
.
Overall Function Check
NBS0023R
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
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 “
EC-574, "Diagnostic Procedure"
ENG SPEED
More than 1,000 rpm
Selector lever
Suitable position
VHCL SPEED SE
More than 36 km/h (22 MPH)
B/FUEL SCHDL
1.0 - 10.0 msec
SEF211Y
SEF239Y
SEF530Q
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
EC-573
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EC
Wiring Diagram
NBS0023S
TBWM1244E
EC-574
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
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 ECM terminals, such as the ground.
Diagnostic Procedure
NBS0023T
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 CON-
SULT-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.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 7.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
111
W/B
ECM relay
(Self shut-off)
[Engine is running]
[Ignition switch: OFF]
●
For a few seconds after turning ignition
switch OFF
0 - 1.5V
[Ignition switch: OFF]
●
More than a few seconds after turning igni-
tion switch OFF
BATTERY VOLTAGE
(11 - 14V)
112
G/Y
Vacuum cut valve bypass
valve
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
119
120
R
R
Power supply for ECM
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
PBIB3161E
PBIB3138E
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