Infiniti F50. Manual — part 486
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
EC-585
C
D
E
F
G
H
I
J
K
L
M
A
EC
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-587, "Diagnostic Procedure"
.
SEF530Q
EC-586
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
Wiring Diagram
EBS00MM4
TBWM0133E
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
EC-587
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
EBS00MM5
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-588
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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