Nissan Pathfinder (2008 year). Manual - part 264

P0442 EVAP CONTROL SYSTEM

EC-229

< COMPONENT DIAGNOSIS >

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P0442 EVAP CONTROL SYSTEM

On Board Diagnosis Logic

INFOID:0000000001376200

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.

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 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
• 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 con-

trol 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

• Fuel tank temperature sensor
• O-ring of EVAP canister vent control valve is 

missing or damaged

• Drain filter
• EVAP canister is saturated with water
• EVAP control system pressure sensor
• Fuel level sensor and the circuit
• Refueling EVAP vapor cut valve
• ORVR system leaks

PBIB3640E

EC-230

< COMPONENT DIAGNOSIS >

[VQ40DE]

P0442 EVAP CONTROL SYSTEM

DTC Confirmation Procedure

INFOID:0000000001376201

NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step.
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 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-III

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-III.

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 “EVP SML LEAK P0442/P1442” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” mode
with CONSULT-III.
Follow the instruction displayed.
NOTE:
If the engine speed cannot be maintained within the range displayed on the CONSULT-III screen, go to

EC-20, "Basic Inspection"

.

6.

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

EC-230, "Diagnosis Procedure"

.

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

 WITH GST

NOTE:
Be sure to read the explanation of Driving Pattern ON 

EC-456

  before driving vehicle.

1.

Start engine.

2.

Drive vehicle according to Driving Pattern, 

EC-456

.

3.

Stop vehicle.

4.

Turn ignition switch OFF, wait at least 10 seconds.

5.

Turn ignition switch ON.

6.

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

7.

Select Service $07 with GST.

-

If P0442 is displayed on the screen, go to 

EC-230, "Diagnosis Procedure"

.

-

If P0441 is displayed on the screen, go to 

EC-225, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001376202

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.

SEF915U

P0442 EVAP CONTROL SYSTEM

EC-231

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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-235, "Component Inspection"

.

OK or NG

OK

>> GO TO 5.

NG

>> Replace fuel filler cap with a genuine one.

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-46, "Description"

.

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

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

6.

CHECK FOR EVAP LEAK

 With CONSULT-III

1.

Turn ignition switch ON.

2.

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

3.

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

CAUTION:

BBIA0550E

SEF916U

EC-232

< COMPONENT DIAGNOSIS >

[VQ40DE]

P0442 EVAP CONTROL SYSTEM

• 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.

4.

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

EC-46, "Description"

.

OK or NG

OK

>> GO TO 8.

NG

>> Repair or replace.

7.

CHECK FOR EVAP LEAK

 Without CONSULT-III

1.

Turn ignition switch OFF.

2.

Apply 12 volts DC to EVAP canister vent control valve (3). The
valve will close. (Continue to apply 12 volts until the end of test.)

-

Fuel filler pipe (top of frame view) (1)

-

EVAP control system pressure sensor (2)

-

EVAP ccanister (4)

-

Drain filter (5)

-

: Vehicle front

3.

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.

CAUTION:

• 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.

4.

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

EC-46, "Description"

.

OK or NG

OK

>> GO TO 8.

NG

>> Repair or replace.

8.

CHECK DRAIN FILTER

Refer to .
OK or NG

OK

>> GO TO 9.

NG

>> Replace drain filter.

9.

CHECK EVAP CANISTER VENT CONTROL VALVE

Check the following.
• EVAP canister vent control valve is installed properly.

Refer to 

EC-484, "Removal and Installation"

.

• EVAP canister vent control valve.

Refer to 

EC-246, "Component Inspection"

.

OK or NG

OK

>> GO TO 10.

SEF200U

AWBIA0134ZZ

SEF200U

P0442 EVAP CONTROL SYSTEM

EC-233

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NG

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

10.

CHECK IF EVAP CANISTER SATURATED WITH WATER

1.

Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.

2.

Does water drain from the EVAP canister?

Yes or No

Yes

>> GO TO 11.

No (With CONSULT-III)>>GO TO 13.
No (Without CONSULT-III)>>GO TO 14.

11.

CHECK EVAP CANISTER

Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor
attached.
The weight should be less than 2.0 kg (4.4 lb).

OK or NG

OK (With CONSULT-III)>>GO TO 13.
OK (Without CONSULT-III)>>GO TO 14.
NG

>> GO TO 12.

12.

DETECT MALFUNCTIONING PART

Check the following.
• EVAP canister for damage
• EVAP hose between EVAP canister and drain filter for clogging or poor connection

>> Repair hose or replace EVAP canister.

13.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

 With CONSULT-III

1.

Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port.

2.

Start engine.

3.

Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode.

4.

Touch “Qu” on CONSULT-III screen to increase “PURG VOL CONT/V” opening to 100%.

5.

Check vacuum hose for vacuum when revving engine up to 2,000 rpm.

OK or NG

OK

>> GO TO 17.

NG

>> GO TO 15.

14.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

 Without CONSULT-III

1.

Start engine and warm it up to normal operating temperature.

2.

Stop engine.

3.

Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port.

4.

Start engine and let it idle for at least 80 seconds.

5.

Check vacuum hose for vacuum when revving engine up to 2,000 rpm.

OK or NG

OK

>> GO TO 16.

NG

>> GO TO 15.

15.

CHECK VACUUM HOSE

BBIA0558E

Vacuum should exist.

EC-234

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P0442 EVAP CONTROL SYSTEM

Check vacuum hoses for clogging or disconnection. Refer to 

EC-46, "Description"

.

OK or NG

OK

>> GO TO 16.

NG

>> Repair or reconnect the hose.

16.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to 

EC-243, "Component Inspection"

.

OK or NG

OK

>> GO TO 17.

NG

>> Replace EVAP canister purge volume control solenoid valve.

17.

CHECK FUEL TANK TEMPERATURE SENSOR

Refer to 

EC-193, "Component Inspection"

.

OK or NG

OK

>> GO TO 18.

NG

>> Replace fuel level sensor unit.

18.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-259, "Component Inspection"

.

OK or NG

OK

>> GO TO 19.

NG

>> Replace EVAP control system pressure sensor.

19.

CHECK EVAP PURGE LINE

Check EVAP purge line (pipe, rubber tube, fuel tank and EVAP canister) for cracks or improper connection.
Refer to 

EC-46, "Description"

.

OK or NG

OK

>> GO TO 20.

NG

>> Repair or reconnect the hose.

20.

CLEAN EVAP PURGE LINE

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

>> GO TO 21.

21.

CHECK EVAP/ORVR LINE

Check EVAP/ORVR line between EVAP canister and fuel tank for clogging, kink, looseness and improper con-
nection. For location, refer to 

EC-405, "System Description"

.

OK or NG

OK

>> GO TO 22.

NG

>> Repair or replace hoses and tubes.

22.

CHECK RECIRCULATION LINE

Check recirculation line between filler neck tube and fuel tank for clogging, kink, cracks, looseness and
improper connection.
OK or NG

OK

>> GO TO 23.

NG

>> Repair or replace hose, tube or filler neck tube.

23.

CHECK REFUELING EVAP VAPOR CUT VALVE

Refer to 

EC-408, "Component Inspection"

.

OK or NG

OK

>> GO TO 24.

NG

>> Replace refueling EVAP vapor cut valve with fuel tank. 

24.

CHECK FUEL LEVEL SENSOR

Refer to 

MWI-33, "Component Inspection"

.

P0442 EVAP CONTROL SYSTEM

EC-235

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OK or NG

OK

>> GO TO 25.

NG

>> Replace fuel level sensor unit.

25.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-47, "Work Flow"

.

>> INSPECTION END

Component Inspection

INFOID:0000000001376537

FUEL TANK VACUUM RELIEF VALVE (BUILT INTO FUEL FILLER CAP)

1.

Wipe clean valve housing.

2.

Check valve opening pressure and vacuum.

3.

If out of specification, replace fuel filler cap as an assembly.

CAUTION:

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

DRAIN FILTER

1.

Check visually for insect nests in the drain filter air inlet.

2.

Check visually for cracks or flaws in the appearance.

3.

Check visually for cracks or flaws in the hose.

4.

Blow air into port A and check that it flows freely out of port B.

5.

Block port B.

6.

Blow air into port A and check that there is no leakage.

7.

If NG, replace drain filter.

SEF445Y

Pressure:

15.3 - 20.0 kPa (0.156 - 0.204 kg/cm

2

, 2.22 - 

2.90 psi)

Vacuum:

−

6.0 to 

−

3.3 kPa (

−

0.061 to 

−

0.034 kg/cm

2

, 

−

0.87 to 

−

0.48 psi)

SEF943S

PBIB3641E

EC-236

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P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Description

INFOID:0000000001376204

SYSTEM DESCRIPTION

*1: ECM determines the start signal status by the signals of engine speed and battery voltage.

*2: This signal is sent to the ECM through CAN communication line.

This system controls flow rate of fuel vapor from the EVAP canister. The opening of the vapor by-pass pas-
sage in the EVAP canister purge volume control solenoid valve changes to control the flow rate. The EVAP
canister purge volume control solenoid valve repeats ON/OFF operation according to the signal sent from the
ECM. The opening of the valve varies for optimum engine control. The optimum value stored in the ECM is
determined by considering various engine conditions. When the engine is operating, the flow rate of fuel vapor
from the EVAP canister is regulated as the air flow changes.

COMPONENT DESCRIPTION

The EVAP canister purge volume control solenoid valve uses a ON/
OFF duty to control the flow rate of fuel vapor from the EVAP canis-
ter. The EVAP canister purge volume control solenoid valve is
moved by ON/OFF pulses from the ECM. The longer the ON pulse,
the greater the amount of fuel vapor that will flow through the valve.

On Board Diagnosis Logic

INFOID:0000000001376206

Sensor

Input Signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed*

1

EVAP canister 
purge flow control

EVAP canister purge vol-
ume control solenoid valve

Mass air flow sensor

Amount of intake air

Engine coolant temperature sensor

Engine coolant temperature

Battery

Battery voltage*

1

Throttle position sensor

Throttle position

Accelerator pedal position sensor

Accelerator pedal position

Air fuel ratio (A/F) sensor 1

Density of oxygen in exhaust gas
(Mixture ratio feedback signal)

Fuel tank temperature sensor

Fuel temperature in fuel tank

Wheel sensor

Vehicle speed*

2

PBIB2057E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0443
0443

EVAP canister purge 
volume control solenoid 
valve

The canister purge flow is detected during the 
specified driving conditions, even when EVAP 
canister purge volume control solenoid valve is 
completely closed.

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

lenoid valve
(The valve is stuck open.)

• EVAP canister vent control valve
• Drain filter
• EVAP canister
• Hoses

(Hoses are connected incorrectly or 
clogged.)