Infiniti Q45 (FY33). Manual — part 240
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SEF809X
SEF811X
DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
I
If DTC P1492 is displayed with P1493, first perform
“TROUBLE DIAGNOSIS FOR DTC P1492”. Refer to
EC-482.
I
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PRO-
CEDURE” has been previously conducted, always turn
ignition switch “OFF” and wait at least 5 seconds before
conducting the next test.
1) Start engine and warm it up to normal operating tem-
perature.
2) Turn ignition switch “OFF” and wait at least 5 seconds.
3) Turn ignition switch “ON”.
4) Select “PURG CN/V & S/V P1493” of “EVAPORATIVE
SYSTEM” in “DTC WORK SUPPORT” mode with CON-
SULT-II.
5) Touch “START”.
6) Start engine (TCS switch “OFF”) and let it idle for at
least 90 seconds.
7) When the following conditions are met, “TESTING” will
be displayed on the CONSULT-II screen. Maintain the
conditions continuously until “TESTING” changes to
“COMPLETED”. (It will take approximately 30 seconds.)
Vehicle speed: 36 - 120 km/h (22 - 75 MPH)
CMPS-RPM (POS): 900 - 6,300 rpm
B/FUEL SCHDL: 2 - 4.8 msec
Selector lever: Suitable position
If “TESTING” is not displayed after 5 minutes, retry
from step 2).
8) Make sure that “OK” is displayed after touching “SELF-
DIAG RESULTS”. If “NG” is displayed, refer to “DIAG-
NOSTIC PROCEDURE”, EC-491.
SEF519R
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1) Start engine (TCS switch “OFF”) and warm it up to nor-
mal operating temperature.
2) Select “MODE 1” with GST.
3) Check coolant temperature.
Coolant temperature: 30 - 100°C (86 - 212°F)
Be sure that water temperature does not exceed 100°C.
If it becomes higher than 100°C, cool down the engine
and perform the procedure again from the beginning.
4) Turn ignition switch “OFF” and wait at least 5 seconds.
5) Turn ignition switch “ON” and wait at least 15 seconds.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P1493
Evaporative Emission (EVAP) Canister Purge
Control Valve/Solenoid Valve (Cont’d)
EC-489
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6) Restart engine and let it idle for at least 90 seconds.
7) Maintain the following conditions for at least 30 sec-
onds.
Vehicle speed: 36 - 120 km/h (22 - 75 MPH)
Engine speed : 900 - 6,300 rpm
Gear position : Suitable gear position
Coolant temperature: 30 - 100°C (86 - 212°F)
8) Select “MODE 7” with GST.
9) If 1st trip DTC is detected, go to “DIAGNOSTIC
PROCEDURE”, EC-491.
NOTE:
I
Hold the accelerator pedal as steady as possible during
driving in steps 7.
I
If the driving conditions are not satisfied in steps 7, restart
the procedure.
I
It is better that the fuel level is low.
SEF639U
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1) Start engine (TCS switch “OFF”) and warm it up to nor-
mal operating temperature.
2) Check voltage between ECM terminal
q
67
and ground
Voltage: 3.12 - 0.8V
Perform the following procedure before the voltage
drops below 0.8V. If the voltage drops below 0.8V, cool
down the engine and perform the entire procedure all
over again.
3) Turn ignition switch “OFF” and wait at least 5 seconds.
4) Turn ignition switch “ON” and wait at least 15 seconds.
5) Restart engine and let it idle for at least 90 seconds.
6) Maintain the following conditions for at least 30 sec-
onds.
Vehicle speed: 40 - 120 km/h (25 - 75 MPH)
Engine speed : 1,000 - 2,100 rpm
Gear position : Suitable gear position
Check voltage between ECM terminal
q
67
and
ground: 3.12 - 0.8V
7) Stop the vehicle, turn ignition switch “OFF”, wait at least
5 seconds, and then turn “ON”.
8) Perform “Diagnostic Test Mode II (Self-diagnostic
results)” with ECM.
9) If 1st trip DTC is detected, go to “DIAGNOSTIC
PROCEDURE”, EC-491.
NOTE:
I
Hold the accelerator pedal as steady as possible during
driving in steps 6.
I
If the driving conditions are not satisfied in steps 6, restart
the procedure.
I
It is better that the fuel level is low.
TROUBLE DIAGNOSIS FOR DTC P1493
Evaporative Emission (EVAP) Canister Purge
Control Valve/Solenoid Valve (Cont’d)
EC-490
![](/vehicles/zatt/fitanyou/tushi/ppiyo.png)
SEF594U
SEF622U
SEF765X
SEF596U
DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK VACUUM SIGNAL.
1. Disconnect vacuum hose to
EVAP canister purge control
valve and install vacuum gauge.
2. Start engine.
3. Perform “PURG CONT S/V” in
“ACTIVE TEST” mode.
4. Select “ON” and “OFF” on CON-
SULT-II screen to turn on
“PURG CONT S/V”.
5. Check vacuum hose for vacuum
while revving engine up to 2,000
rpm.
ON: Vacuum should exist.
OFF: Vacuum should not
exist.
-------------------------------------------------------------------------------------------------------------------------------------- OR --------------------------------------------------------------------------------------------------------------------------------------
1. Start engine and warm it up to
normal operating temperature.
2. Stop engine.
3. Disconnect vacuum hose to
EVAP canister purge control
valve.
4. Install vacuum gauge and start
engine.
5. Check vacuum hose for vacuum
when revving engine up to 2,000
rpm.
ON: Vacuum should exist.
OFF: Vacuum should not
exist.
OK
E
NG
CHECK COMPONENTS
(EVAP canister purge con-
trol solenoid valve).
Refer to “COMPONENTS
INSPECTION” on next
page.
OK
Check vacuum hoses for
improper connection, clog-
ging or disconnection.
Refer to Vacuum Hose
Drawing”, EC-19.
CHECK COMPONENT
(EVAP canister vent control valve).
Refer to “COMPONENTS INSPECTION”,
EC-493.
OK
E
NG
Replace EVAP canister
vent control valve and/or
water separator.
CHECK IF EVAP CANISTER IS SATU-
RATED WITH WATER.
1. Remove EVAP canister with vent con-
trol valve attached.
2. Check if water drains from the EVAP
canister.
If it will, weigh the EVAP canister with
the vent control valve attached.
If the weight is:
More than 1.8 kg (4.0 lb)
→
NG
Less than 1.8 kg (4.0 lb)
→
OK
OK
E
NG
Replace EVAP canister
and check the following.
1. Check hose connections
to the EVAP canister
and water separator for
clogging and poor con-
nection.
2. Check water separator.
Refer to “COMPONENT
INSPECTION”, EC-493.
CHECK COMPONENT
(EVAP canister purge control valve).
Refer to “COMPONENT INSPECTION”,
EC-493.
OK
E
NG
Replace EVAP canister
purge control valve.
q
A
(Go to next page.)
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P1493
Evaporative Emission (EVAP) Canister Purge
Control Valve/Solenoid Valve (Cont’d)
H
H
H
H
H
H
EC-491
![](/vehicles/zatt/fitanyou/tushi/jurin.png)
SEF427U
q
A
CHECK COMPONENT
(EVAP control system pressure sensor).
1. Check disconnection of hose connected
to the sensor.
2. Check sensor harness connector for
water soak.
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 EVAPORATIVE EMISSION LINE.
Check EVAP purge line hoses for leak or
clogging.
Refer to “Evaporative Emission Line
Drawing”, EC-29.
OK
E
NG
Repair EVAP purge line
hoses.
INSPECTION END
SEF765X
SEF400W
SEF313Q
COMPONENT INSPECTION
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.
TROUBLE DIAGNOSIS FOR DTC P1493
Evaporative Emission (EVAP) Canister Purge
Control Valve/Solenoid Valve (Cont’d)
H
H
H
EC-492
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