Infiniti Q45. Manual — part 481
DTC P1490 VACUUM CUT VALVE BYPASS VALVE
EC-563
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EC
DTC P1490 VACUUM CUT VALVE BYPASS VALVE
PFP:17372
Description
NBS0023G
COMPONENT DESCRIPTION
The vacuum cut valve and vacuum cut valve bypass valve are installed in parallel on the EVAP purge line
between the fuel tank and the EVAP canister.
The vacuum cut valve prevents the intake manifold vacuum from being applied to the fuel tank.
The vacuum cut valve bypass valve is a solenoid type valve and generally remains closed. It opens only for on
board diagnosis.
The vacuum cut valve bypass valve responds to signals from the ECM. When the ECM sends an ON (ground)
signal, the valve is opened. The vacuum cut valve is then bypassed to apply intake manifold vacuum to the
fuel tank.
EVAPORATIVE EMISSION SYSTEM DIAGRAM
CONSULT-II Reference Value in Data Monitor Mode
NBS0023H
Specification data are reference values.
On Board Diagnosis Logic
NBS0023I
PBIB0026E
SEF323U
MONITOR ITEM
CONDITION
SPECIFICATION
VC/V BYPASS/V
●
Ignition switch: ON
OFF
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1490
1490
Vacuum cut valve bypass
valve circuit
An improper voltage signal is sent to ECM
through vacuum cut valve bypass valve.
●
Harness or connectors
(The valve circuit is open or shorted.)
●
Vacuum cut valve bypass valve
EC-564
DTC P1490 VACUUM CUT VALVE BYPASS VALVE
DTC Confirmation Procedure
NBS0023J
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:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.
WITH CONSULT-II
1.
Turn ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Start engine and wait at least 5 seconds.
4.
If 1st trip DTC is detected, go to
EC-566, "Diagnostic Procedure"
.
WITH GST
Follow the procedure WITH CONSULT-II above.
SEF058Y
DTC P1490 VACUUM CUT VALVE BYPASS VALVE
EC-565
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Wiring Diagram
NBS0023K
TBWM1244E
EC-566
DTC P1490 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
NBS0023L
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 CIRCUIT
With CONSULT-II
1.
Turn ignition switch OFF and then ON.
2.
Select “VC/V BYPASS/V” in “ACTIVE TEST” mode with CON-
SULT-II.
3.
Touch “ON/OFF” on CONSULT-II screen.
4.
Make sure that clicking sound is heard from the vacuum cut
valve bypass valve.
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 3.
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)
PBIB3138E
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