Infiniti Q45 (FY33). Manual — part 235
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 P1448
Evaporative Emission (EVAP) Canister Vent
Control Valve (Open) (Cont’d)
EC-469
SEF623U
Vacuum Cut Valve Bypass Valve (Circuit)
COMPONENT DESCRIPTION
The vacuum cut valve and vacuum cut valve bypass valve are
installed in parallel on the EVAP purge line between the fuel tank
and the EVAP canister.
The vacuum cut valve prevents the intake manifold vacuum from
being applied to the fuel tank.
The vacuum cut valve bypass valve is a solenoid type valve and
generally remains closed. It opens only for on board diagnosis.
The vacuum cut valve bypass valve responds to signals from the
ECM. When the ECM sends an ON (ground) signal, the valve is
opened. The vacuum cut valve is then bypassed to apply intake
manifold vacuum to the fuel tank.
EVAPORATIVE EMISSION SYSTEM DIAGRAM
SEF850U
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
VC/V BYPASS/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)
45
LG/B
Vacuum cut valve bypass
valve
Ignition switch “ON”
BATTERY VOLTAGE
(11 - 14V)
ON BOARD DIAGNOSIS LOGIC
Diagnostic Trouble
Code No.
Malfunction is detected when .
Check Items
(Possible Cause)
P1490
0801
I
An improper voltage signal is sent to ECM through
vacuum cut valve bypass valve.
I
Harness or connectors
(The vacuum cut valve bypass valve circuit is
open or shorted.)
I
Vacuum cut valve bypass valve
TROUBLE DIAGNOSIS FOR DTC P1490
EC-470
SEF392X
DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn the igni-
tion switch “OFF” and wait at least 5 seconds before conduct-
ing the next test.
1) Turn ignition switch “ON”.
2) Select “DATA MONITOR” mode with CONSULT-II.
3) Start engine and wait at least 5 seconds.
4) If 1st trip DTC is detected, go to “DIAGNOSTIC
PROCEDURE”, EC-473.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Follow the procedure “With CONSULT-II” above.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P1490
Vacuum Cut Valve Bypass Valve (Circuit)
(Cont’d)
EC-471
TEC070M
TROUBLE DIAGNOSIS FOR DTC P1490
Vacuum Cut Valve Bypass Valve (Circuit)
(Cont’d)
EC-472
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