Infiniti Q45 (FY33). Manual — part 228
SEC050C
AEC783A
EVAP canister vent control valve
Check air passage continuity.
Perform “VENT CONTROL/V” in “ACTIVE TEST” mode with
CONSULT-II.
Condition
VENT CONTROL/V
Air passage continuity
between
q
A
and
q
B
ON
No
OFF
Yes
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Condition
Air passage continuity
between
q
A
and
q
B
12V direct current supply between ter-
minals
q
1
and
q
2
No
No supply
Yes
If NG or operation takes more than 1 second, clean valve using air
blower or replace as necessary.
If the portion
q
B
is rusted, replace EVAP canister vent control
valve.
Make sure new O-ring is installed properly.
SEF829T
Water separator
1.
Check visually for insect nests in the water separator air inlet.
2.
Check visually for cracks or flaws in the appearance.
3.
Check visually for cracks or flaws in the hose.
4.
Check that
q
A
and
q
C
are not clogged by blowing air into
q
B
with
q
A
, and then
q
C
plugged.
5.
In case of NG in items 2 - 4, replace the parts.
NOTE:
Do not disassemble water separator.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P1440
Evaporative Emission (EVAP) Control System
(Small Leak) (Positive Pressure) (Cont’d)
EC-441
SEF359W
Absolute pressure sensor
1.
Remove absolute pressure sensor with its harness connector
connected.
2.
Remove hose from absolute pressure sensor.
3.
Turn ignition switch “ON” and check output voltage between
terminal
q
64
and ground.
The voltage should be 3.2 to 4.8V.
4.
Use pump to apply vacuum of −26.7 kPa (−200 mmHg, −7.87
inHg) to absolute pressure sensor as shown in figure and
check the output voltage.
The voltage should be 1.0 to 1.4V lower than the value
measured in step 3.
CAUTION:
I
Always calibrate the vacuum pump gauge when using it.
I
Do not apply below −93.3 kPa (−700 mmHg, −27.56 inHg)
or over 101.3 kPa (760 mmHg, 29.92 inHg) of pressure.
5.
If NG, replace absolute pressure sensor.
SEF767X
SEF768X
MEC488B
MAP/BARO switch solenoid valve
1. Start engine and warm it up to normal operating tem-
perature.
2. Perform “MAP/BARO SW/V” in “ACTIVE TEST” mode
with CONSULT-II.
3. Check the following.
I
Condition: At idle under no-load
I
CONSULT-II display
MAP/BARO SW/V
ABSOL PRES/SE (Voltage)
BARO
More than 2.6V
MAP
Less than the voltage at BARO
I
Time for voltage to change
MAP/BARO SW/V
Required time to switch
BARO to MAP
Less than 1 second
MAP to BARO
4. If NG, check solenoid valve as shown below.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1. Remove MAP/BARO switch solenoid valve.
2. Check air passage continuity.
Condition
Air passage
continuity
between
q
A
and
q
B
Air passage
continuity
between
q
A
and
q
C
12V direct current supply
between terminals
q
1
and
q
2
Yes
No
No supply
No
Yes
3. If NG or operation takes more than 1 second, replace
solenoid valve.
TROUBLE DIAGNOSIS FOR DTC P1440
Evaporative Emission (EVAP) Control System
(Small Leak) (Positive Pressure) (Cont’d)
EC-442
SEF405UA
Fuel tank temperature sensor
Check resistance by heating with hot water or heat gun as shown
in the figure.
Temperature °C (°F)
Resistance k
Ω
20 (68)
2.3 - 2.7
50 (122)
0.79 - 0.90
If NG, replace fuel tank temperature sensor.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P1440
Evaporative Emission (EVAP) Control System
(Small Leak) (Positive Pressure) (Cont’d)
EC-443
Evaporative Emission (EVAP) Canister Purge
Volume Control Valve
SYSTEM DESCRIPTION
Camshaft position sensor
E
Engine speed
ECM
E
EVAP canister
purge volume
control valve
Mass air flow sensor
E
Amount of intake air
Engine coolant temperature sen-
sor
E
Engine coolant temperature
Ignition switch
E
Start signal
Throttle position sensor
E
Throttle position
Heated oxygen sensor 1 (front)
E
Density of oxygen in exhaust gas
(Mixture ratio feedback signal)
Fuel tank temperature sensor
E
Fuel temperature in fuel tank
Vehicle speed sensor
E
Vehicle speed
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 valve changes to control the flow rate. A built-in step motor
moves the valve in steps corresponding to the ECM output pulses. The opening of the valve varies for opti-
mum engine control. The optimum value stored in the ECM is determined by considering various engine con-
ditions. When the engine is operating, the flow rate of fuel vapor from the EVAP canister is regulated as the
air flow changes.
SEF249P
COMPONENT DESCRIPTION
The EVAP canister purge volume control valve uses a step motor
to control the flow rate of fuel vapor from the EVAP canister. This
motor has four winding phases. It operates according to the output
pulse signal of the ECM. Two windings are turned ON and OFF in
sequence. Each time an ON pulse is issued, the valve opens or
closes, changing the flow rate. When no change in the flow rate is
needed, the ECM does not issue the pulse signal. A certain volt-
age signal is issued so that the valve remains at that particular
opening.
TROUBLE DIAGNOSIS FOR DTC P1444
EC-444
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