Infiniti M45 (Y34). Manual - part 468

DTC P1448 EVAP CANISTER VENT CONTROL VALVE

EC-561

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Wiring Diagram

ABS002QY

TBWA0291E

EC-562

DTC P1448 EVAP CANISTER VENT CONTROL 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

ABS002QZ

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 EVAP CANISTER VENT CONTROL VALVE

Refer to 

EC-564, "Component Inspection"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Replace EVAP canister vent control valve.

3. 

CHECK VACUUM CUT VALVE

Refer to 

EC-598, "Component Inspection"

 .

OK or NG

OK

>> GO TO 4.

NG

>> Replace vacuum cut 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

DTC P1448 EVAP CANISTER VENT CONTROL VALVE

EC-563

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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 1.8 kg (4.0 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 HOSE

Check disconnection or improper connection of hose connected to EVAP control system pressure sensor.
OK or NG

OK

>> GO TO 8.

NG

>> Repair it.

8. 

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 9.

NG

>> Replace EVAP control system pressure sensor.

9. 

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-369, "Component Inspection"

 .

OK or NG

OK

>> GO TO 10.

NG

>> Replace EVAP control system pressure sensor.

SEF596U

Water should not exist.

EC-564

DTC P1448 EVAP CANISTER VENT CONTROL VALVE

10. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

ABS002R0

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.

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.

7.

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

8.

Perform Test No. 9 again.

With GST

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.

4.

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

5.

Perform Test No. 9 again.

SEF337X

PBIB0153E

SEF337X

PBIB0154E