Nissan Frontier D22. Manual — part 491
DTC P1442 EVAP CONTROL SYSTEM
EC-1067
[VG33E]
C
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EC
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"
EC-1077, "DTC Confirmation Procedure"
Diagnostic Procedure
UBS00DOL
Refer to
EC-962, "Diagnostic Procedure"
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
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Fuel filler cap remains open or fails to
close.
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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.
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EVAP canister
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EVAP purge line (pipe and rubber tube)
leaks
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EVAP purge line rubber tube bent
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Blocked or bent rubber tube to EVAP
control system pressure sensor
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Loose or disconnected rubber tube
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EVAP canister vent control valve and the
circuit
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EVAP canister purge volume control
solenoid valve
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Fuel tank temperature sensor
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O-ring of EVAP canister vent control
valve is missing or damaged.
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Water separator
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EVAP canister is saturated with water
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Fuel level sensor and the circuit
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EVAP control system pressure sensor
●
Refueling control valve
●
ORVR system leaks
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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
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Air conditioner switch OFF
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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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EC
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
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.
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EVAP control system pressure sensor
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EVAP canister purge volume control
solenoid valve
(The valve is stuck open.)
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EVAP canister vent control valve
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EVAP canister
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Hoses
(Hoses are connected incorrectly or
clogged.)
PBIB1460E
EC-1070
[VG33E]
DTC P1444 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
Wiring Diagram
UBS00DOQ
BBWA1085E
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