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