Infiniti F50. Manual - part 484

 

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Infiniti F50. Manual - part 484

 

 

DTC P1490 VACUUM CUT VALVE BYPASS VALVE

EC-577

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EC

DTC P1490 VACUUM CUT VALVE BYPASS VALVE

PFP:17372

Description

EBS00MLS

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

EBS00MLT

Specification data are reference values.

On Board Diagnosis Logic

EBS00MLU

PBIB0026E

SEF323U

MONITOR ITEM

CONDITION

SPECIFICATION

VC/V BYPAS S/V

Ignition switch: ON

OFF

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1490
1490

Vacuum cut valve bypass 
valve circuit

An improper voltage signal is sent to ECM 
through vacuum cut valve bypass valve.

Harness or connectors
(The valve circuit is open or shorted.)

Vacuum cut valve bypass valve

EC-578

DTC P1490 VACUUM CUT VALVE BYPASS VALVE

DTC Confirmation Procedure

EBS00MLV

NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch “OFF” and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

 WITH CONSULT-II

1.

Turn ignition switch “ON”.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Start engine and wait at least 5 seconds.

4.

If 1st trip DTC is detected, go to 

EC-580, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

SEF058Y

DTC P1490 VACUUM CUT VALVE BYPASS VALVE

EC-579

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Wiring Diagram

EBS00MLW

TBWM0133E

EC-580

DTC P1490 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 ECM terminals, such as the ground.

Diagnostic Procedure

EBS00MLX

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 CON-
SULT-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)

43

G/Y

Vacuum cut valve 
bypass valve

[Ignition switch “ON”]

BATTERY VOLTAGE
(11 - 14V)

PBIB0157E

 

 

 

 

 

 

 

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