Nissan Frontier D22. Manual - part 491

DTC P1442 EVAP CONTROL SYSTEM

EC-1067

[VG33E]

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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

UBS00DOK

Refer to 

EC-960, "DTC Confirmation Procedure"

  or 

EC-1077, "DTC Confirmation Procedure"

 .

Diagnostic Procedure

UBS00DOL

Refer to 

EC-962, "Diagnostic Procedure"

  or 

EC-1080, "Diagnostic Procedure"

 .

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1442

EVAP control system 
small leak detected 
(positive 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

●

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

●

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 system pressure sensor

●

Loose or disconnected rubber tube

●

EVAP canister vent control valve and the 
circuit

●

EVAP canister purge volume control 
solenoid valve

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Fuel tank temperature sensor

●

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

●

Water separator

●

EVAP canister is saturated with water

●

Fuel level sensor and the circuit

●

EVAP control system pressure sensor

●

Refueling control valve

●

ORVR system leaks

●

Foreign matter caught in EVAP canister 
purge volume control solenoid valve

EC-1068

[VG33E]

DTC P1444 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

DTC P1444 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

PFP:14920

Description

UBS00DOM

SYSTEM DESCRIPTION 

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.

CONSULT-II Reference Value in Data Monitor Mode

UBS00DON

Specification data are reference values.

Sensor

Input Signal to ECM

ECM func-

tion

Actuator

Camshaft position sensor

Engine speed

EVAP can-
ister purge 
flow con-
trol

EVAP canister purge volume 
control solenoid valve

Mass air flow sensor

Amount of intake air

Engine coolant temperature sensor

Engine coolant temperature

Ignition switch

Start signal

Throttle position sensor

Throttle position

Throttle position switch

Closed throttle position

Heated oxygen sensors 1

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

Fuel tank temperature sensor

Fuel temperature in fuel tank

Vehicle speed sensor

Vehicle speed

SEF337U

MONITOR ITEM

CONDITION

SPECIFICATION

PURG VOL C/V

●

Engine: After warming up

●

Air conditioner switch OFF

●

Shift lever: N (A/T), Neutral (M/T)

●

No load

Idle (Vehicle stopped)

0%

2,000 rpm

—

DTC P1444 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

EC-1069

[VG33E]

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On Board Diagnosis Logic

UBS00DOO

DTC Confirmation Procedure

UBS00DOP

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 5 seconds before conducting the next test.
TESTING CONDITION:
Always perform test at a temperature of 5

°C (41°F) or more.

 WITH CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF and wait at least 5 seconds.

3.

Turn ignition switch ON.

4.

Select “PURG VOL CN/V P1444” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” mode with
CONSULT-II.

5.

Touch “START”.

6.

Start engine and let it idle until “TESTING” on CONSULT-II changes to “COMPLETED”. (It will take for
approximately 10 seconds.)
If “TESTING” is not displayed after 5 minutes, retry from step 2.

7.

Make sure that “OK” is displayed after touching “SELF-DIAG RESULTS”. If “NG” is displayed, refer to 

EC-

1072, "Diagnostic Procedure"

 .

 WITH GST

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF and wait at least 5 seconds.

3.

Start engine and let it idle for at least 20 seconds.

4.

 Select MODE 7 with GST.

5.

If 1st trip DTC is detected, go to 

EC-1072, "Diagnostic Procedure"

 .

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1444

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 
solenoid valve
(The valve is stuck open.)

●

EVAP canister vent control valve

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EVAP canister

●

Hoses
(Hoses are connected incorrectly or 
clogged.)

PBIB1460E

EC-1070

[VG33E]

DTC P1444 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Wiring Diagram

UBS00DOQ

BBWA1085E