Infiniti F50. Manual - part 477

 

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Infiniti F50. Manual - part 477

 

 

DTC P1446 EVAP CANISTER VENT CONTROL VALVE

EC-549

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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

ABS002QQ

1. 

CHECK RUBBER TUBE

1.

Turn ignition switch “OFF”.

2.

Disconnect rubber tube connected to EVAP canister vent control valve.

3.

Check the rubber tube for clogging.

OK or NG

OK

>> GO TO 2.

NG

>> Clean rubber tube using an air blower.

2. 

CHECK WATER SEPARATOR

Refer to 

EC-338, "Component Inspection"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Clean or replace water separator.

3. 

CHECK EVAP CANISTER VENT CONTROL VALVE

Refer to 

EC-551, "Component Inspection"

 .

OK or NG

OK

>> GO TO 4.

NG

>> Replace EVAP canister vent control valve.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

158

L/Y

EVAP canister vent control 
valve

[Ignition switch “ON”]

BATTERY VOLTAGE
(11 - 14V)

PBIB0026E

EC-550

DTC P1446 EVAP CANISTER VENT CONTROL VALVE

4. 

CHECK IF EVAP CANISTER SATURATED WITH WATER

1.

Remove EVAP canister with EVAP canister vent control valve attached.

2.

Check if water will drain from the EVAP canister.

Yes or No

Yes

>> GO TO 5.

No

>> GO TO 7.

5. 

CHECK EVAP CANISTER

Weigh the EVAP canister with the EVAP canister vent control valve attached.
The weight should be less than 2.1 kg (4.6 lb).

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

6. 

DETECT MALFUNCTIONING PART

Check the following.

●

EVAP canister for damage

●

EVAP hose between EVAP canister and water separator for clogging or poor connection

>> Repair hose or replace EVAP canister.

7. 

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR

1.

Disconnect EVAP control system pressure sensor harness connector.

2.

Check connectors for water.

OK or NG

OK

>> GO TO 8.

NG

>> Replace EVAP control system pressure sensor.

8. 

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-365, "Component Inspection"

 .

OK or NG

OK

>> GO TO 9.

NG

>> Replace EVAP control system pressure sensor.

9. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

SEF596U

Water should not exist.

DTC P1446 EVAP CANISTER VENT CONTROL VALVE

EC-551

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Component Inspection

ABS002QR

EVAP CANISTER VENT CONTROL VALVE

 With CONSULT-II

1.

Remove EVAP canister vent control valve from EVAP canister.

2.

Check portion B  of EVAP canister vent control valve for being
rusted.
If NG, replace EVAP canister vent control valve.
If OK, go to next step.

3.

Reconnect harness connectors disconnected.

4.

Turn ignition switch “ON”.

5.

Perform “VENT CONTROL/V” in “ACTIVE TEST” mode.

6.

Check air passage continuity and operation delay time.
Make sure new O-ring is installed properly.

Operation takes less than 1 second.

If NG, replace EVAP canister vent control valve.
If OK, go to next step.

7.

Clean the air passage (Portion A  to B ) of EVAP canister vent control valve using an air blower.

8.

Perform step 5 again.

 Without CONSULT-II

1.

Remove EVAP canister vent control valve from EVAP canister.

2.

Check portion B  of EVAP canister vent control valve for being
rusted.

3.

Check air passage continuity and operation delay time under the
following conditions.
Make sure new O-ring is installed properly.

Operation takes less than 1 second.

If NG, replace EVAP canister vent control valve.
If OK, go to next step.

4.

Clean the air passage (Portion A  to B ) of EVAP canister vent control valve using an air blower.

5.

Perform step 3 again.

SEF337X

Condition VENT CONTROL/V

Air passage continuity between A and B

ON

No

OFF

Yes

PBIB0153E

SEF337X

Condition

Air passage continuity between A and B

12V direct current supply between
 terminals 1 and 2

No

OFF

Yes

PBIB0154E

EC-552

DTC P1448 EVAP CANISTER VENT CONTROL VALVE

DTC P1448 EVAP CANISTER VENT CONTROL VALVE

PFP:14935

Component Description

EBS00ML1

NOTE:
If DTC P1448 is displayed with P0442, P0455, P0456, P1442 or P1456, perform trouble diagnosis for
DTC P1448 first.
The EVAP canister vent control valve is located on the EVAP canis-
ter and is used to seal the canister vent.
This solenoid valve responds to signals from the ECM. When the
ECM sends an ON signal, the coil in the solenoid valve is energized.
A plunger will then move to seal the canister vent. The ability to seal
the vent is necessary for the on board diagnosis of other evaporative
emission control system components.
This solenoid valve is used only for diagnosis, and usually remains
opened.
When the vent is closed, under normal purge conditions, the evapo-
rative emission control system is depressurized and allows “EVAP
Control System (Small Leak)” diagnosis.

CONSULT-II Reference Value in Data Monitor Mode

EBS00ML2

Specification data are reference values.

On Board Diagnosis Logic

EBS00ML3

SEF032W

PBIB0026E

MONITOR ITEM

CONDITION

SPECIFICATION

VENT CONT/V

●

Ignition switch: ON

OFF

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1448
1448

EVAP canister vent control 
valve open

EVAP canister vent control valve remains 
open under specified driving conditions.

●

EVAP canister vent control valve

●

EVAP control system pressure sensor 
and the circuit

●

Blocked rubber tube to EVAP canister 
vent control valve

●

Water separator

●

EVAP canister is saturated with water

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Vacuum cut valve

 

 

 

 

 

 

 

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