Infiniti Q45 (FY33). Manual — part 194
![](/vehicles/zatt/fitanyou/tushi/fuclohethalo.png)
SEF765X
SEF400W
SEF313Q
EVAP canister purge control solenoid valve
1. Turn ignition switch “ON”.
2. Select “PURG CONT S/V” of “ACTIVE TEST” mode
with CONSULT-II.
3. Start engine and warm it up to normal operating tem-
perature.
4. Disconnect vacuum hose at EVAP canister purge con-
trol valve.
5. Touch “ON” and “OFF” and check for vacuum passing
through the hose.
Condition
Vacuum
Idle
Not exist
2,000 rpm
Exist
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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
Yes
No
No supply
No
Yes
If NG or operation takes more than 1 second, replace solenoid
valve.
SEF809W
EVAP canister purge control valve
Check EVAP canister purge control valve as follows:
1.
Blow air in port
q
A
and
q
C
, then ensure that there is no leak-
age.
2.
Blow air in port
q
B
, then ensure that there is a resistance to flow
out of port
q
C
.
3.
Apply vacuum to port
q
A
. [Approximately −13.3 to −20.0 kPa
(−100 to −150 mmHg, −3.94 to −5.91 inHg)]
Blow air in port
q
C
and ensure free flow out of port
q
B
.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0440
Evaporative Emission (EVAP) Control System
(Small Leak) (Negative Pressure) (Cont’d)
EC-305
![](/vehicles/zatt/fitanyou/tushi/anur.png)
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 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.
SEF747W
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.
TROUBLE DIAGNOSIS FOR DTC P0440
Evaporative Emission (EVAP) Control System
(Small Leak) (Negative Pressure) (Cont’d)
EC-306
![](/vehicles/zatt/fitanyou/tushi/kates.png)
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.
Doing so will damage the absolute pressure sensor.
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.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0440
Evaporative Emission (EVAP) Control System
(Small Leak) (Negative Pressure) (Cont’d)
EC-307
![](/vehicles/zatt/fitanyou/tushi/ave.png)
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.
TROUBLE DIAGNOSIS FOR DTC P0440
Evaporative Emission (EVAP) Control System
(Small Leak) (Negative Pressure) (Cont’d)
EC-308
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