Nissan Murano. Manual - part 549

EC-306

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0448 EVAP CANISTER VENT CONTROL VALVE

-

Fully released accelerator pedal and keep engine idle for at least 35 seconds.

7.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-306, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009720034

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.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Clean rubber tube using an air blower.

2.

CHECK EVAP CANISTER VENT CONTROL VALVE

Refer to 

EC-303, "Component Inspection"

.

Is he inspection result normal?

YES

>> GO TO 3.

NO

>> Replace EVAP canister vent control valve. Refer to 

FL-16, "Exploded View"

.

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. Refer to 

FL-16, "Exploded View"

.

2.

Check if water will drain from the EVAP canister.

Does water drain from the EVAP canister?

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 2.1 kg (4.6 lb).

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART

Check the following.
• EVAP canister for damage

PBIB0972E

JMBIA1134GB

P0448 EVAP CANISTER VENT CONTROL VALVE

EC-307

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

>> Repair hose or replace EVAP canister. Refer to 

FL-16, "Exploded View"

.

6.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR

1.

Disconnect EVAP control system pressure sensor harness connector.

2.

Check that water is not inside connectors.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace EVAP control system pressure sensor. Refer to 

FL-16, "Exploded View"

.

7.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-312, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Replace EVAP control system pressure sensor. Refer to 

FL-16, "Exploded View"

.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-44, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000009720035

1.

CHECK EVAP CANISTER VENT CONTROL VALVE-I

1.

Remove EVAP canister vent control valve from EVAP canister. Refer to 

FL-16, "Exploded View"

.

2.

Check portion (A) of EVAP canister vent control valve for rust.

Is it rusted?

YES

>> Replace EVAP canister vent control valve. Refer to 

FL-

16, "Exploded View"

.

NO

>> GO TO 2.

2.

CHECK EVAP CANISTER VENT CONTROL VALVE-II

With CONSULT

1.

Reconnect harness connectors disconnected.

2.

Turn ignition switch ON.

3.

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

4.

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

Operation takes less than 1 second.

Without CONSULT

1.

Disconnect EVAP canister vent control valve harness connector.

2.

Check air passage continuity and operation delay time under the
following conditions.

Check that new O-ring is installed properly.

JMBIA0168ZZ

Condition VENT CONTROL/V

Air passage continuity between (A) and (B)

ON

Not existed

OFF

Existed

JMBIA0169ZZ

EC-308

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0448 EVAP CANISTER VENT CONTROL VALVE

Operation takes less than 1 second.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 3.

3.

CHECK EVAP CANISTER VENT CONTROL VALVE-III

With CONSULT

1.

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

2.

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

3.

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

Operation takes less than 1 second.

Without CONSULT

1.

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

2.

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

Operation takes less than 1 second.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace EVAP canister vent control valve. Refer to 

FL-16, "Exploded View"

.

Condition

Air passage continuity between (A) and (B)

12 V direct current supply between
 terminals 1 and 2

Not existed

OFF

Existed

Condition VENT CONTROL/V

Air passage continuity between (A) and (B)

ON

No

OFF

Yes

Condition

Air passage continuity between (A) and (B)

12 V direct current supply between
 terminals (1) and (2)

No

OFF

Yes

JMBIA0169ZZ

P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

EC-309

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P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR

Description

INFOID:0000000009720036

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

DTC Logic

INFOID:0000000009720037

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

NOTE:
Never remove fuel filler cap during DTC confirmation procedure.

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

With CONSULT>>GO TO 2.
Without CONSULT>>GO TO 5.

2.

PERFORM DTC CONFIRMATION PROCEDURE-1

With CONSULT

1.

Start engine and let it idle for least 40 seconds.
NOTE:
Do not depress accelerator pedal even slightly.

2.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Proceed to 

EC-310, "Diagnosis Procedure"

.

NO

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE-2

With CONSULT

PBIB3370E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0451

EVAP control system 
pressure sensor perfor-
mance

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

• Harness or connectors

(EVAP control system pressure sensor 
circuit is shorted.)
[CKP sensor (POS) circuit is shorted.]
(APP sensor 2 circuit is shorted.)
(Refrigerant pressure sensor circuit is 
shorted.)

• EVAP control system pressure sensor
• Crankshaft position sensor (POS)
• Accelerator pedal position sensor
• Refrigerant pressure sensor