Nissan Frontier D22. Manual — part 602
DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE
EC-1511
[VG33ER]
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EC
DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE
PFP:14920
Description
UBS00DXN
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
UBS00DXO
Specification data are reference values.
Sensor
Input Signal to ECM
ECM function
Actuator
Camshaft position sensor
Engine speed
EVAP canister
purge flow control
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
—
EC-1512
[VG33ER]
DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE
On Board Diagnosis Logic
UBS00DXP
DTC Confirmation Procedure
UBS00DXQ
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:
Before performing the following procedure, confirm battery voltage is more than 11V at idle.
WITH CONSULT-II
1.
Turn ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Start engine and let it idle for at least 13 seconds.
4.
If 1st trip DTC is detected, go to
WITH GST
Follow the procedure “WITH CONSULT-II”.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0444
EVAP canister purge volume
control solenoid valve circuit
open
An excessively low voltage signal is sent
to ECM through the valve
●
Harness or connectors
(The solenoid valve circuit is open or
shorted.)
●
EVAP canister purge volume control
solenoid valve
P0445
EVAP canister purge volume
control solenoid valve circuit
shorted
An excessively high voltage signal is sent
to ECM through the valve
●
Harness or connectors
(The solenoid valve circuit is shorted.)
●
EVAP canister purge volume control
solenoid valve
SEF058Y
DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE
EC-1513
[VG33ER]
C
D
E
F
G
H
I
J
K
L
M
A
EC
Wiring Diagram
UBS00DXR
BBWA1085E
EC-1514
[VG33ER]
DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than the ECM terminals, such as the ground.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
4
OR/B
ECM relay
(Self shutoff)
[Engine is running]
[Ignition switch: OFF]
●
For a few seconds after turning ignition switch
OFF
0 - 1.5V
[Ignition switch: OFF]
●
A few seconds passed after turning ignition
switch OFF
BATTERY VOLTAGE
(11 - 14V)
5
R/Y
EVAP canister purge
volume control sole-
noid valve
[Engine is running]
●
Idle speed
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
●
Engine speed is 2,000 rpm (More than 100
seconds after starting engine)
BATTERY VOLTAGE
(11 - 14V)
67
B/P
Power supply for ECM
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
72
B/P
Power supply for ECM
[Ignition switch: ON]
BATTERY VOLTAGE
(11 - 14V)
117
B/P
Current return
[Engine is running]
●
Idle speed
BATTERY VOLTAGE
(11 - 14V)
SEF994U
SEF995U
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