Infiniti FX35, FX50 (S51). Manual - part 686

P0441 EVAP CONTROL SYSTEM

EC-285

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

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2.

PERFORM DTC CONFIRMATION PROCEDURE-I

With CONSULT-III

TESTING CONDITION:
Always perform test at a temperature of 5

°

C (41

°

F) or more.

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.

Start engine and let it idle for at least 70 seconds.

6.

Select “PURG FLOW P0441” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” mode with CON-
SULT-III.

7.

Touch “START”.

Is “COMPLETED” displayed on CONSULT-III screen?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE-II

When the following conditions are met, “TESTING” will be displayed on the CONSULT-III screen. Maintain the
conditions continuously until “TESTING” changes to “COMPLETED”. (It will take at least 35 seconds.)

CAUTION:

Always drive vehicle at a safe speed.
NOTE:
If “TESTING” does not change for a long time, retry from step 2.
Is “COMPLETED” displayed on CONSULT-III screen?

YES

>> GO TO 4.

NO

>> Perform DTC CONFIRMATION PROCEDURE again. GO TO 2.

4.

PERFORM DTC CONFIRMATION PROCEDURE-III

Touch “SELF-DIAG RESULTS”.
Which is displayed on CONSULT-III screen?

OK

>> INSPECTION END

NG

>> Go to 

EC-286, "Diagnosis Procedure"

.

5.

PERFORM COMPONENT FUNCTION CHECK

With GST

Perform component function check. Refer to 

EC-285, "Component Function Check"

.

NOTE:
Use component function check to check the overall monitoring function of the EVAP control system purge flow
monitoring. During this check, a 1st trip DTC might not be confirmed.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-286, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000005236877

1.

PERFORM COMPONENT FUNCTION CHECK

With GST

1.

Lift up drive wheels.

2.

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

Selector lever

Suitable position

VHCL SPEED SE

32 - 120 km/h (20 - 75 mph)

ENG SPEED

500 - 3,000 rpm

B/FUEL SCHDL

1.3 - 9.0 msec

COOLAN TEMP/S

More than 0

°

C (32

°

F)

EC-286

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

P0441 EVAP CONTROL SYSTEM

3.

Turn ignition switch OFF and wait at least 10 seconds.

4.

Turn ignition switch ON.

5.

Turn ignition switch OFF and 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 condition.

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

>> Go to 

EC-286, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005236878

1.

CHECK EVAP CANISTER

1.

Turn ignition switch OFF.

2.

Check EVAP canister for cracks.

Is the inspection result normal?

YES-1 >> With CONSULT-III: GO TO 2.
YES-2 >> Without CONSULT-III: GO TO 3.
NO

>> Replace EVAP canister.

2.

CHECK PURGE FLOW

With CONSULT-III

1.

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

2.

Start engine and let it idle.

3.

Select “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT-III.

4.

Touch “Qd” and “Qu” on CONSULT-III screen to adjust “PURG VOL CONT/V” opening and check vacuum
existence.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 4.

3.

CHECK PURGE FLOW

 Without CONSULT-III

1.

Start engine and warm it up to normal operating temperature.

ECM

Connector

+

–

Terminal

Terminal

M107

102

(EVAP control system pressure sensor signal)

112

Air conditioner switch

ON

Headlamp 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 CONT/V

Vacuum

100%

Existed

0%

Not existed

P0441 EVAP CONTROL SYSTEM

EC-287

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

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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-84, "System Dia-

gram"

.

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-84, "System Diagram"

.

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-III: GO TO 6.
YES-2 >> Without CONSULT-III: GO TO 7.
NO

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

6.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

With CONSULT-III

1.

Start engine.

2.

Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT-III. Check that engine speed var-
ies according to the valve opening.

Does engine speed vary according to the valve opening?

YES

>> GO TO 8.

NO

>> GO TO 7.

Vacuum should not exist.

Vacuum should exist.

SEF367U

SEF368U

EC-288

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

P0441 EVAP CONTROL SYSTEM

7.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to 

EC-299, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Replace EVAP canister purge volume control solenoid valve.

8.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR

1.

Disconnect EVAP control system pressure sensor harness connector.

2.

Check connectors for water.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Replace EVAP control system pressure sensor.

9.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR FUNCTION

Refer to 

EC-315, "DTC Logic"

 for DTC P0452, 

EC-320, "DTC Logic"

 for DTC P0453.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Replace EVAP control system pressure sensor.

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

Refer to 

EC-305, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> Replace EVAP canister vent control valve.

12.

CHECK EVAP PURGE LINE

Inspect EVAP purge line (pipe and rubber tube). Check for evidence of leaks.
Refer to 

EC-84, "System Diagram"

.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Repair or replace malfunctioning part.

13.

CLEAN EVAP PURGE LINE

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

>> GO TO 14.

14.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

Water should not exist.