Infiniti Q45. Manual - part 439

DTC P0441 EVAP CONTROL SYSTEM

EC-395

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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 Confirmation Procedure for DTC P0452 

EC-437

 , P0453 

EC-444

 .

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-435, "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-33, "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-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Water should not exist.

EC-396

DTC P0442 EVAP CONTROL SYSTEM

DTC P0442 EVAP CONTROL SYSTEM

PFP:14950

On Board Diagnosis Logic

NBS001WY

NOTE:
If DTC P0442 is displayed with P0447, first perform trouble diagnosis for DTC P0447. (See 

EC-419

 .)

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 vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister
purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the
EVAP purge line off. The EVAP canister purge volume control solenoid valve is 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 prop-
erly.

●

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.

●

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

●

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

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Blocked or bent rubber tube to EVAP control sys-
tem pressure sensor

●

Loose or disconnected rubber tube

●

EVAP canister vent control valve and the circuit

●

EVAP canister purge volume control solenoid 
valve and the circuit

●

Fuel tank temperature sensor

●

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

●

Water separator

●

EVAP canister is saturated with water

●

EVAP control system pressure sensor

●

Fuel level sensor and the circuit

●

Refueling control valve

●

ORVR system leaks

SEF323U

DTC P0442 EVAP CONTROL SYSTEM

EC-397

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CAUTION:

●

Use only a genuine NISSAN fuel filler cap as a replacement. If an incorrect fuel filler cap is used,
the MIL may come on.

●

If the fuel filler cap is not tightened properly, the MIL may come on.

●

Use only a genuine NISSAN rubber tube as a replacement.

DTC Confirmation Procedure

NBS001WZ

NOTE:

●

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait
at least 10 seconds before conducting the next test.

TESTING CONDITION:

●

Perform “DTC WORK SUPPORT” 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 0 to 30

°

C (32 to 86

°

F).

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Turn ignition switch ON and select “DATA MONITOR” mode with
CONSULT-II.

4.

Make sure that the following conditions are met.
COOLAN TEMP/S: 0 - 70

°

C (32 - 158

°

F)

INT/A TEMP SE: 0 - 30

°

C (32 - 86

°

F)

5.

Select “EVAP SML LEAK P0442/P1442” of “EVAPORATIVE
SYSTEM” in “DTC WORK SUPPORT” mode with CONSULT-II.
Follow the instruction displayed.

NOTE:
If the engine speed cannot be maintained within the range displayed on the CONSULT-II screen, go to

EC-71, "Basic Inspection"

 .

6.

Make sure that “OK” is displayed.
If “NG” is displayed, refer to 

EC-398, "Diagnostic Procedure"

 .

NOTE:
Make sure that EVAP hoses are connected to EVAP canister
purge volume control solenoid valve properly.

SEF475Y

PBIB0829E

SEC763C

EC-398

DTC P0442 EVAP CONTROL SYSTEM

 WITH GST

NOTE:
Be sure to read the explanation of 

EC-58, "Driving Pattern"

  before driving vehicle.

1.

Start engine.

2.

Drive vehicle according to 

EC-58, "Driving Pattern"

 .

3.

Stop vehicle.

4.

Turn ignition switch OFF, wait at least 10 seconds and then turn ON.

5.

Select “Service $07” with GST.

–

If P0442 is displayed on the screen, go to 

EC-398, "Diagnostic Procedure"

 .

–

If P0441 is displayed on the screen, go to 

EC-393, "Diagnostic Procedure"

 .

–

If P1442 is displayed on the screen, go to 

EC-548, "Diagnostic Procedure"

 .

Diagnostic Procedure

NBS001X0

1. 

CHECK FUEL FILLER CAP DESIGN

1.

Turn ignition switch OFF.

2.

Check for genuine NISSAN fuel filler cap design.

OK or NG

OK

>> GO TO 2.

NG

>> Replace with genuine NISSAN fuel filler cap.

2. 

CHECK FUEL FILLER CAP INSTALLATION

Check that the cap is tightened properly by rotating the cap clockwise.

OK or NG

OK

>> GO TO 3.

NG

>> 1. Open fuel filler cap, then clean cap and fuel filler neck threads using air blower.

2. Retighten until ratcheting sound is heard.

3. 

CHECK FUEL FILLER CAP FUNCTION

Check for air releasing sound while opening the fuel filler cap.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4. 

CHECK FUEL TANK VACUUM RELIEF VALVE

Refer to 

EC-35, "FUEL TANK VACUUM RELIEF VALVE (BUILT INTO FUEL FULLER CAP)"

 .

OK or NG

OK

>> GO TO 5.

NG

>> Replace fuel filler cap with a genuine one.

SEF915U