Infiniti M45 (Y34). Manual — part 476
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
EC-593
C
D
E
F
G
H
I
J
K
L
M
A
EC
Overall Function Check
ABS002RT
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-595, "Diagnostic Procedure"
.
SEF530Q
EC-594
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
Wiring Diagram
ABS002RU
TBWA0310E
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
EC-595
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 ECM terminals, such as the ground.
Diagnostic Procedure
ABS002RV
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)
43
G/Y
Vacuum cut valve
bypass valve
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
PBIB0161E
EC-596
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
3.
CHECK VACUUM CUT VALVE BYPASS VALVE OPERATION
Without 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.
Disconnect vacuum cut valve bypass valve harness connector.
7.
Supply battery voltage to the terminal.
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.
4.
CHECK EVAP PURGE LINE
Check EVAP purge line between EVAP canister and fuel tank for clogging or disconnection.
OK or NG
OK
>> GO TO 5.
NG
>> Repair it.
5.
CHECK EVAP PURGE PORT
Check EVAP purge port of fuel tank for clogging.
OK or NG
OK
>> GO TO 6.
NG
>> Clean EVAP purge port.
6.
CHECK EVAP CANISTER
1.
Pinch the fresh air hose.
2.
Blow air into port A and check that it flows freely out of port B .
OK or NG
OK
>> GO TO 12.
NG
>> Replace EVAP canister.
PBIB0635E
AEC630A
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