Infiniti M35/M45 Y50. Manual - part 656

DTC P0441 EVAP CONTROL SYSTEM

EC-1097

[VK45DE]

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9.

If NG, go to 

EC-1097, "Diagnostic Procedure"

 .

Diagnostic Procedure

NBS005H0

1. 

CHECK EVAP CANISTER

1.

Turn ignition switch OFF.

2.

Check EVAP canister for cracks.

OK or NG

OK (With CONSULT-II)>>GO TO 2.
OK (Without CONSULT-II)>>GO TO 3.
NG

>> Replace EVAP canister.

2. 

CHECK PURGE FLOW

 With CONSULT-II

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-742, "EVAPORA-

TIVE EMISSION LINE DRAWING"

 .

2.

Start engine and let it idle.

3.

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

4.

Rev engine up to 2,000 rpm.

5.

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

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 4.

3. 

CHECK PURGE FLOW

 Without CONSULT-II

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-742, "EVAPORA-

TIVE EMISSION LINE DRAWING"

 .

4.

Start engine and let it idle.
Do not depress accelerator pedal even slightly.

5.

Check vacuum gauge indication before 60 seconds passed after starting engine.

6.

Revving engine up to 2,000rpm after 100 seconds passed after starting engine.

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 4.

PURG VOL CONT/V

Vacuum

100%

Should exist.

0%

Should not exist.

PBIB1678E

Vacuum should not exist.

Vacuum should exist.

EC-1098

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DTC P0441 EVAP CONTROL SYSTEM

4. 

CHECK EVAP PURGE LINE

1.

Turn ignition switch OFF.

2.

Check EVAP purge line for improper connection or disconnection.
Refer to 

EC-742, "EVAPORATIVE EMISSION LINE DRAWING"

 .

OK or NG

OK

>> GO TO 5.

NG

>> Repair it.

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.

OK or NG

OK (With CONSULT-II)>>GO TO 6.
OK (Without CONSULT-II)>>GO TO 7.
NG

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

6. 

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

 With CONSULT-II

1.

Start engine.

2.

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

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 7.

7. 

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to 

EC-1121, "Component Inspection"

 .

OK or NG

OK

>> GO TO 8.

NG

>> Replace EVAP canister purge volume control solenoid valve.

SEF367U

SEF368U

PBIB1678E

DTC P0441 EVAP CONTROL SYSTEM

EC-1099

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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 FUNCTION

Refer to DTC P0452 

EC-1140, "DTC Confirmation Procedure"

 , P0453 

EC-1146, "DTC Confirmation Proce-

dure"

 .

OK or NG

OK

>> GO TO 10.

NG

>> 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.

OK or NG

OK

>> GO TO 11.

NG

>> Clean the rubber tube using an air blower.

11. 

CHECK EVAP CANISTER VENT CONTROL VALVE

Refer to 

EC-1128, "Component Inspection"

 .

OK or NG

OK

>> GO TO 12.

NG

>> 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-742, "EVAPORATIVE EMISSION LINE DRAWING"

 .

OK or NG

OK

>> GO TO 13.

NG

>> Replace it.

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 

EC-857, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Water should not exist.

EC-1100

[VK45DE]

DTC P0442 EVAP CONTROL SYSTEM

DTC P0442 EVAP CONTROL SYSTEM

PFP:14950

On Board Diagnosis Logic

NBS005H1

This diagnosis detects leaks in the EVAP purge line using engine intake manifold vacuum.
If pressure does not increase, the ECM will check for leaks in the line between the fuel tank and EVAP canister
purge volume control solenoid valve, under the following “Vacuum test” conditions.
The EVAP canister vent control valve is closed to shut the EVAP purge line off. The EVAP canister purge vol-
ume control solenoid valve will then be opened to depressurize the EVAP purge line using intake manifold
vacuum. After this occurs, the EVAP canister purge volume control solenoid valve will be closed.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0442
0442

EVAP control system 
small leak detected 
(negative pressure)

EVAP control system has a leak, 
EVAP control system does not 
operate properly.

●

Incorrect fuel tank vacuum relief valve

●

Incorrect fuel filler cap used

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Fuel filler cap remains open or fails to close.

●

Foreign matter caught in fuel filler cap.

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Leak is in line between intake manifold and EVAP 
canister purge volume control solenoid valve.

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Foreign matter caught in EVAP canister vent control 
valve.

●

EVAP canister or fuel tank leaks

●

EVAP purge line (pipe and rubber tube) leaks

●

EVAP purge line rubber tube bent

●

Loose or disconnected rubber tube

●

EVAP canister vent control valve and the circuit

●

EVAP canister purge volume control solenoid valve 
and the circuit

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Fuel tank temperature sensor

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O-ring of EVAP canister vent control valve is missing 
or damaged

●

EVAP canister is saturated with water

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EVAP control system pressure sensor

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Fuel level sensor and the circuit

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Refueling EVAP vapor cut valve

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ORVR system leaks

PBIB1026E