Infiniti G35 (V35). Manual - part 389

DTC P0448 EVAP CANISTER VENT CONTROL VALVE

EC-437

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3. 

CHECK IF EVAP CANISTER SATURATED WITH WATER

1.

Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.

2.

Does water drain from the EVAP canister?

Yes or No

Yes

>> GO TO 4.

No

>> GO TO 6.

4. 

CHECK EVAP CANISTER

Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor
attached.
The weight should be less than 2.2 kg (4.9 lb).

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 5.

5. 

DETECT MALFUNCTIONING PART

Check the following.

●

EVAP canister for damage

●

EVAP hose between EVAP canister and vehicle frame for clogging or poor connection

>> Repair hose or replace EVAP canister.

6. 

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 7.

NG

>> Replace EVAP control system pressure sensor.

7. 

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-448, "Component Inspection"

 .

OK or NG

OK

>> GO TO 8.

NG

>> Replace EVAP control system pressure sensor.

8. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-151, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

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>> INSPECTION END

PBIB1031E

Water should not exist.

EC-438

DTC P0448 EVAP CANISTER VENT CONTROL VALVE

Component Inspection

NBS000ZP

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 6 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.

PBIB1033E

Condition VENT CONTROL/V

Air passage continuity between A and B

ON

No

OFF

Yes

PBIB1679E

PBIB1033E

Condition

Air passage continuity between A and B

12V direct current supply between
 terminals 1 and 2

No

OFF

Yes

PBIB1034E

DTC P0448 EVAP CANISTER VENT CONTROL VALVE

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5.

Perform step 3 again.

EC-440

DTC P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

DTC P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

PFP:22365

Component Description

NBS000T8

The EVAP control system pressure sensor detects pressure in the purge line. The sensor output voltage to the
ECM increases as pressure increases.

CONSULT-II Reference Value in Data Monitor Mode

NBS000T9

Specification data are reference values.

On Board Diagnosis Logic

NBS000TA

NOTE:
If DTC P0451 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643.
Refer to 

EC-499, "DTC P0643 SENSOR POWER SUPPLY"

 .

PBIB1086E

PBIB1207E

MONITOR ITEM

CONDITION

SPECIFICATION

EVAP SYS PRES

●

Ignition switch: ON

Approx. 1.8 - 4.8V

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0451
0451

EVAP control system 
pressure sensor perfor-
mance

ECM detects a sloshing signal from the EVAP 
control system pressure sensor

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Harness or connectors

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EVAP control system pressure sensor