Nissan Frontier D22. Manual — part 501
DTC P1490 VACUUM CUT VALVE BYPASS VALVE
EC-1107
[VG33E]
C
D
E
F
G
H
I
J
K
L
M
A
EC
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 the ECM terminals, such as the ground.
Diagnostic Procedure
UBS00DPK
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 CONSULT-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)
120
P/B
Vacuum cut valve bypass
valve
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
SEF014Z
EC-1108
[VG33E]
DTC P1490 VACUUM CUT VALVE BYPASS VALVE
3.
CHECK VACUUM CUT VALVE BYPASS VALUE POWER SUPPLY CIRCUIT
Without CONSULT-II
1.
Turn ignition switch OFF.
2.
Disconnect vacuum cut valve bypass valve harness connector.
3.
Turn ignition switch ON.
4.
Check voltage between terminal 1 and ground with CONSULT-II
or tester.
OK or NG
OK >> GO
TO
5.
NG
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors E43, M65
●
Harness connectors M67, C1
●
Fuse block (J/B) connector E49
●
10A fuse
●
Harness for open or short between vacuum cut valve bypass valve and fuse
>> Repair harness or connectors.
5.
CHECK VACUUM CUT VALVE BYPASS VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between ECM terminal 120 and vacuum cut valve bypass valve terminal 2.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 6.
SEF186S
Voltage: Battery voltage
SEF659W
Continuity should exist.
DTC P1490 VACUUM CUT VALVE BYPASS VALVE
EC-1109
[VG33E]
C
D
E
F
G
H
I
J
K
L
M
A
EC
6.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors C1, M67
●
Harness connectors M81, F36
●
Harness for open or short between vacuum cut valve bypass valve and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
7.
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.
Without CONSULT-II
Check air passage continuity and operation delay time under the fol-
lowing conditions.
Operation takes less than 1 second.
OK or NG
OK
>> GO TO 8.
NG
>> Replace vacuum cut valve bypass valve.
8.
CHECK INTERMITTENT INCIDENT
Refer to
EC-696, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END.
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 terminals 1 and 2
Yes
No supply
No
PBIB1430E
EC-1110
[VG33E]
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
PFP:17372
Description
UBS00DPL
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
UBS00DPM
Specification data are reference values.
SEF186S
PBIB1438E
MONITOR ITEM
CONDITION
SPECIFICATION
VC/V BYPASS/V
●
Ignition switch: ON
OFF
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