Nissan Frontier D22. Instruction — part 646
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
EC-1687
[VG33ER]
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EC
On Board Diagnosis Logic
UBS00E21
DTC Confirmation Procedure
UBS00E22
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 5 seconds before conducting the next test.
TESTING CONDITION:
Always perform test at a temperature of 5 to 30
°C (41 to 86°F).
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 5 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 displayed on the CONSULT-II screen. Maintain
the conditions continuously 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
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1491
Vacuum cut valve
bypass valve
Vacuum cut valve bypass valve does
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 control valve
●
Refueling EVAP vapor cut valve
CMPS·RPM (POS)
More than 500 rpm
Selector lever
Suitable position
Vehicle speed
More than 36 km/h (22 MPH)
B/FUEL SCHDL
1.0 - 11.0 msec
PBIB1462E
EC-1688
[VG33ER]
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
Overall Function Check
UBS00E23
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-1690, "Diagnostic Procedure"
SEF530Q
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
EC-1689
[VG33ER]
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Wiring Diagram
UBS00E24
BBWA1094E
EC-1690
[VG33ER]
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 the ECM terminals, such as the ground.
Diagnostic Procedure
UBS00E25
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.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 5.
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)
SEF017Z
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