Infiniti Q45. Manual - part 477

DTC P1442 EVAP CONTROL SYSTEM

EC-547

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●

Use only a genuine NISSAN rubber tube as a replacement.

DTC Confirmation Procedure

NBS0022L

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-548, "Diagnostic Procedure"

 .

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

PBIB2869E

PBIB0829E

SEC763C

EC-548

DTC P1442 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 P1442 is displayed on the screen, go to 

EC-548, "Diagnostic Procedure"

 .

–

If P0441 is displayed on the screen, go to 

EC-393, "Diagnostic Procedure"

 .

–

If P0442 is displayed on the screen, go to 

EC-398, "Diagnostic Procedure"

 .

Diagnostic Procedure

NBS0022M

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

>>

●

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

●

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

DTC P1442 EVAP CONTROL SYSTEM

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5. 

INSTALL THE PRESSURE PUMP

To locate the EVAP leak, install EVAP service port adapter and pres-
sure pump to EVAP service port securely. For the location of EVAP
service port, refer to 

EC-33, "EVAPORATIVE EMISSION LINE

DRAWING"

 .

NOTE:
Improper installation of the EVAP service port adapter to the
EVAP service port may cause leaking.

With CONSULT-II>>GO TO 6.
Without CONSULT-II>>GO TO 7.

6. 

CHECK FOR EVAP LEAK

 With CONSULT-II

1.

Turn ignition switch ON.

2.

Select “EVAP SYSTEM CLOSE” of “WORK SUPPORT” mode with CONSULT-II.

3.

Touch “START” and apply pressure into the EVAP line until the
pressure indicator reaches the middle of the bar graph.

NOTE:

●

Never use compressed air or a high pressure pump.

●

Do not exceed 4.12 kPa (0.042 kg/cm

2

 , 0.6 psi) of pres-

sure in the system.

4.

Using EVAP leak detector, locate the EVAP leak. For the leak
detector, refer to the instruction manual for more details.
Refer to 

EC-33, "EVAPORATIVE EMISSION LINE DRAWING"

 .

OK or NG

OK

>> GO TO 8.

NG

>> Repair or replace.

SEF916U

PEF917U

SEF200U

EC-550

DTC P1442 EVAP CONTROL SYSTEM

7. 

CHECK FOR EVAP LEAK

 Without CONSULT-II

1.

Turn ignition switch OFF.

2.

Apply 12 volts DC to EVAP canister vent control valve. The valve will close. (Continue to apply 12 volts
until the end of test.)

3.

Apply 12 volts DC to vacuum cut valve bypass valve. The valve will open. (Continue to apply 12V until the
end of test.)

4.

Pressurize the EVAP line using pressure pump with 1.3 to 2.7 kPa (10 to 20 mmHg, 0.39 to 0.79 inHg),
then remove pump and EVAP service port adapter.

NOTE:

●

Never use compressed air or a high pressure pump.

●

Do not exceed 4.12 kPa (0.042 kg/cm

2

 , 0.6 psi) of pressure in the system.

5.

Using EVAP leak detector, locate the EVAP leak. For the leak
detector, refer to the instruction manual for more details. Refer
to 

EC-33, "EVAPORATIVE EMISSION LINE DRAWING"

 .

OK or NG

OK

>> GO TO 8.

NG

>> Repair or replace.

8. 

CHECK WATER SEPARATOR

Refer to 

EC-553, "Component Inspection"

 .

OK or NG

OK

>> GO TO 9.

NG

>> Replace water separator.

9. 

CHECK EVAP CANISTER VENT CONTROL VALVE, O-RING AND CIRCUIT

Refer to 

EC-420, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> GO TO 10.

NG

>> Repair or replace EVAP canister vent control valve and O-ring or harness/connector.

PBIB0189E

SEF200U