Nissan Pathfinder. Manual - part 497

EC-294

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0441 EVAP CONTROL SYSTEM

Without CONSULT

1. Lift up drive wheels.

2. Start engine (VDC switch OFF) and warm it up to normal operating temperature.

3. Turn ignition switch OFF, wait at least 10 seconds.

4. Turn ignition switch ON.

5. Turn ignition switch OFF, wait at least 10 seconds.

6. Start engine and wait at least 70 seconds.

7. Set voltmeter probes to ECM harness connector terminals under the following conditions.

8. Check EVAP control system pressure sensor value at idle speed and note it.

9. Establish and maintain the following conditions for at least 1 minute.

10. Verify that EVAP control system pressure sensor value stays 0.1 V less than the value at idle speed (mea-

sured at step 6) for at least 1 second.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

EC-295, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009178205

1.

CHECK EVAP CANISTER

1. Turn ignition switch OFF.

2. Check EVAP canister for cracks.
Is the inspection result normal?

YES-1 >> With CONSULT: GO TO 2.

YES-2 >> Without CONSULT: GO TO 3.

NO

>> Replace EVAP canister. Refer to 

FL-18, "Removal and Installation"

.

2.

CHECK PURGE FLOW

With CONSULT

1. Disconnect vacuum hose connected to EVAP canister purge volume control solenoid valve at EVAP ser-

vice port and install vacuum gauge. For the location of EVAP service port, refer to 

EC-41, "EVAPORATIVE

EMISSION SYSTEM : System Description"

.

2. Start engine and let it idle.

3. Select “PURG VOL C/V” in “ACTIVE TEST” mode with CONSULT.

4. Touch “Qd” and “Qu” on CONSULT screen to adjust “PURG VOL C/V” opening and check vacuum exist-

ence.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 4.

ECM

Connector

+

–

Terminal

E16

102

112

Air conditioner switch

ON

Head lamp switch

ON

Rear window defogger switch

ON

Engine speed

Approx. 3,000 rpm

Gear position

Any position other than P, N or R

PURG VOL C/V

Vacuum

100%

Existed

0%

Not existed

P0441 EVAP CONTROL SYSTEM

EC-295

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

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3.

CHECK PURGE FLOW

 Without CONSULT

1. Start engine and warm it up to normal operating temperature.

2. Stop engine.

3. Disconnect vacuum hose connected to EVAP canister purge volume control solenoid valve at EVAP ser-

vice port and install vacuum gauge. For the location of EVAP service port, refer to 

EC-41, "EVAPORATIVE

EMISSION SYSTEM : System Description"

.

4. Start engine and let it idle.

Do not depress accelerator pedal even slightly.

5. Check vacuum gauge indication before 60 seconds pass after starting engine.

6. Rev engine up to 2,000 rpm after 100 seconds pass after starting engine.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 4.

4.

CHECK EVAP PURGE LINE

1. Turn ignition switch OFF.

2. Check EVAP purge line for improper connection or disconnection.

Refer to 

EC-41, "EVAPORATIVE EMISSION SYSTEM : System Description"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair EVAP purge line.

5.

CHECK EVAP PURGE HOSE AND PURGE PORT

1. Disconnect purge hoses connected to EVAP service port A and

EVAP canister purge volume control solenoid valve B.

2. Blow air into each hose and EVAP purge port C.

3. Check that air flows freely.
Is the inspection result normal?

YES-1 >> With CONSULT: GO TO 6.

YES-2 >> Without CONSULT: GO TO 7.

NO

>> Repair or clean hoses and/or purge port.

6.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

With CONSULT

1. Start engine.

2. Perform “PURG VOL C/V” in “ACTIVE TEST” mode with CONSULT. Check that engine speed varies

according to the valve opening.

Vacuum should not exist.

Vacuum should exist.

SEF367U

SEF368U

EC-296

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0441 EVAP CONTROL SYSTEM

Does engine speed vary according to the valve opening?

YES

>> GO TO 8.

NO

>> GO TO 7.

7.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Check EVAP canister purge volume control solenoid valve. Refer to 

EC-301, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Replace EVAP canister purge volume control solenoid valve. Refer to 

EC-14, "ENGINE CON-

TROL SYSTEM : Component Parts Location"

.

8.

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 9.

NO

>> Replace EVAP control system pressure sensor. Refer to 

FL-18, "Removal and Installation"

.

9.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR FUNCTION

Check EVAP control system pressure sensor function. Refer to 

EC-316, "DTC Logic"

 for DTC P0452, 

EC-319,

"DTC Logic"

 for DTC P0453.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Replace EVAP control system pressure sensor. Refer to 

FL-18, "Removal and Installation"

.

10.

CHECK RUBBER TUBE FOR CLOGGING

1. Disconnect rubber tube connected to EVAP canister vent control valve.

2. Check the rubber tube for clogging.
Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Clean the rubber tube using an air blower.

11.

CHECK EVAP CANISTER VENT CONTROL VALVE

Check EVAP canister vent control valve. Refer to 

EC-307, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> Replace EVAP canister vent control valve. Refer to 

FL-18, "Removal and Installation"

.

12.

CHECK EVAP PURGE LINE

Inspect EVAP purge line (pipe and rubber tube). Check for evidence of leakage.

Refer to 

EC-41, "EVAPORATIVE EMISSION SYSTEM : System Description"

.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Repair EVAP purge line.

13.

CLEAN EVAP PURGE LINE

Clean EVAP purge line (pipe and rubber tube) using air blower.

>> Check intermittent incident. Refer to 

GI-49, "Intermittent Incident"

.

P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

EC-297

< DTC/CIRCUIT DIAGNOSIS >

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P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

DTC Logic

INFOID:0000000009178206

DTC DETECTION LOGIC

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.

TESTING CONDITION:

• Perform “DTC CONFIRMATION PROCEDURE” when the fuel level is between 1/4 and 3/4 full, and

vehicle is placed on flat level surface.

• Always perform test at a temperature of 5 to 60

°C (41 to 140°F).

• Cool the vehicle so that engine coolant temperature becomes same level as ambient temperature.
Do you have CONSULT

YES

>> GO TO 2.

NO

>> GO TO 4.

2.

PERFORM DTC CONFIRMATION PROCEDURE A

With CONSULT

1. Turn ignition switch ON.

2. Check that the following condition are met.

FUEL T/TMP SE: 0 - 35

°C (32 - 95°F)

3. Start engine and wait at least 60 seconds.

4. Check 1st trip DTC.
IS 1st trip DTC detected?

YES

>> Proceed to 

EC-299, "Diagnosis Procedure"

.

NO

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE B

With CONSULT

1. Start engine and warm it up to normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Turn ignition switch ON.

4. Turn ignition switch OFF and wait at least 10 seconds.

5. Turn ignition switch ON.

6. Select “PURG VOL CN/V P1444” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” mode with

CONSULT.

7. Touch “START”.

8. Start engine and let it idle until “TESTING” on CONSULT changes to “COMPLETED”. (It will take approxi-

mately 10 seconds.)

If “TESTING” is not displayed after 5 minutes, retry from step 2.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0443

PURG VOLUME CONT/V
(Evaporative emission system 
purge control valve circuit)

A

The canister purge flow is detected dur-
ing the vehicle is stopped while the en-
gine is running, even when EVAP 
canister purge volume control solenoid 
valve is completely closed.

• EVAP control system pressure sensor
• EVAP canister purge volume control 

solenoid valve
(The valve is stuck open.)

• EVAP canister vent control valve
• EVAP  canister
• Hoses

(Hoses are connected incorrectly or 
clogged.)

B

The canister purge flow is detected dur-
ing the specified driving conditions, even 
when EVAP canister purge volume con-
trol solenoid valve is completely closed.