Infiniti Q45 (FY33). Manual — part 233
SEF600U
SEF594U
SEF427U
SEF419U
q
A
CHECK COMPONENT
(EVAP canister purge control solenoid
valve).
Refer to “COMPONENT INSPECTION”,
EC-463.
OK
E
NG
Replace EVAP canister
purge control solenoid
valve.
CHECK COMPONENT
(EVAP canister purge control valve).
Refer to “COMPONENT INSPECTION”,
EC-463.
OK
E
NG
Replace EVAP canister
purge control valve.
CHECK COMPONENT AND CIRCUIT
(EVAP control system pressure sensor).
1. Check disconnection of hose connected
to the sensor.
2. Check sensor harness connector for
water.
Water should not exist.
If OK, go to step 3.
3. Check EVAP control system pressure
sensor. Refer to “COMPONENT
INSPECTION”, EC-320.
OK
E
NG
Replace EVAP control sys-
tem pressure sensor and
repair or replace harness
and connector.
CHECK COMPONENT
(EVAP canister vent control valve and
O-ring).
Refer to “COMPONENT INSPECTION”,
EC-455.
OK
E
NG
Replace EVAP canister
vent control valve and
O-ring.
CHECK EVAP PURGE LINE.
Inspect EVAP purge line (pipe and rubber
tube). Check for evidence of leaks.
OK
E
NG
Replace it.
Clean EVAP purge line (pipe and rubber
tube) using air blower.
Perform “TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT”, EC-117.
INSPECTION END
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P1447
Evaporative Emission (EVAP) Control System
Purge Flow Monitoring (Cont’d)
H
H
H
H
H
H
H
H
EC-461
SEF353Q
SEC049C
SEF763P
COMPONENT INSPECTION
EVAP canister purge volume control valve
1) Disconnect EVAP canister purge volume control valve
harness connector.
2) Check resistance between the following terminals.
terminal
q
2
and terminals
q
1
,
q
3
terminal
q
5
and terminals
q
4
,
q
6
Resistance:
Approximately 35 - 43
Ω
[At 25°C (77°F)]
3) Reconnect EVAP canister purge volume control valve
harness connector.
4) Remove EVAP canister purge volume control valve
from intake manifold collector and disconnect hoses
from the valve.
(Plug the purge hoses. The EVAP canister purge vol-
ume control valve harness connector should remain
connected.)
5) Turn ignition switch “ON”.
6) Perform “PURG VOL CONT/V” in “ACTIVE TEST”
mode with CONSULT-II. Check that EVAP canister
purge volume control valve shaft moves smoothly for-
ward and backward according to the valve opening.
If NG, replace the EVAP canister purge volume control
valve.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1) Disconnect EVAP canister purge volume control valve
harness connector.
2) Check resistance between the following terminals.
terminal
q
2
and terminals
q
1
,
q
3
terminal
q
5
and terminals
q
4
,
q
6
Resistance:
Approximately 35 - 43
Ω
[At 25°C (77°F)]
3) Reconnect EVAP canister purge volume control valve
harness connector.
4) Remove EVAP canister purge volume control valve
from intake manifold collector and disconnect hoses
from the valve.
(Plug the purge hoses. The EVAP canister purge vol-
ume control valve harness connector should remain
connected.)
5) Turn ignition switch “ON” and “OFF”. Check that EVAP
canister purge volume control valve shaft moves
smoothly forward and backward according to the igni-
tion switch position.
If NG, replace the EVAP canister purge volume control
valve.
SEF593U
TROUBLE DIAGNOSIS FOR DTC P1447
Evaporative Emission (EVAP) Control System
Purge Flow Monitoring (Cont’d)
EC-462
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
.
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 1 second, replace solenoid valve.
AEC140A
One-way valve
Check one-way valve air passage continuity.
Condition
Air passage continuity
Blow air into side B to A
Yes
Blow air into side A to B
No
If NG, replace one-way valve.
Make sure to install one-way valve with the colored side fac-
ing the vacuum.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P1447
Evaporative Emission (EVAP) Control System
Purge Flow Monitoring (Cont’d)
EC-463
SEF378Q
SEF419U
Evaporative Emission (EVAP) Canister Vent
Control Valve (Open)
COMPONENT DESCRIPTION
NOTE:
If DTC P1448 is displayed with P0440, P1440, perform
TROUBLE DIAGNOSIS FOR DTC P1448 first.
The EVAP canister vent control valve is located on the EVAP can-
ister and is used to seal the canister vent.
This solenoid (the EVAP canister vent control valve) responds to
signals from the ECM.
When the ECM sends an ON signal, the coil in the solenoid valve
is energized.
A plunger will then move to seal the canister vent. The ability to seal
the vent is necessary for the on board diagnosis of other evapora-
tive emission control system components.
This solenoid valve is used only for diagnosis, and usually remains
opened.
When the vent is closed, under normal purge conditions, the
evaporative emission control system is depressurized and allows
“EVAP Control System (Small Leak)” diagnosis.
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
VENT CONT/V
I
Ignition switch: ON
OFF
ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring voltage. Doing so may result in damage to the
ECM’s transistor. Use a ground other than ECM terminals such as the body ground.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA
(DC Voltage)
20
P/B
EVAP canister vent con-
trol valve
Ignition switch “ON”
BATTERY VOLTAGE
(11 - 14V)
ON BOARD DIAGNOSIS LOGIC
Diagnostic
Trouble Code
No.
Malfunction is detected when .
Check Items
(Possible Cause)
P1448
0309
I
EVAP canister vent control valve remains opened
under specified driving conditions.
I
EVAP canister vent control valve
I
EVAP control system pressure sensor
I
Blocked rubber tube to EVAP canister vent control
valve
I
Water separator
I
EVAP canister is saturated with water.
I
Vacuum cut valve
TROUBLE DIAGNOSIS FOR DTC P1448
EC-464
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