Infiniti Q45 (FY33). Manual — part 198
SEF273Y
SEF356W
DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting
the next test.
TESTING CONDITION:
I
Always perform test at a temperature above 5°C (41°F).
I
Before performing the following procedure, confirm that
battery voltage is more than 10V at idle.
1) Start engine and warm it at idle up to normal operating
temperature.
2) Turn ignition switch “OFF” and wait at least 5 seconds.
3) Turn ignition switch “ON”.
4) Select “DATA MONITOR” mode with CONSULT-II.
5) Make sure that “TANK F/TEMP SE” is more than 0°C
(32°F).
6) Start engine and wait at least 12 seconds.
7) If 1st trip DTC is detected, go to “DIAGNOSTIC
PROCEDURE”, EC-323.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1) Start engine and warm it up to normal operating tem-
perature.
2) Check that voltage between ECM terminal
q
92
and
ground is less than 4.2V.
3) Turn ignition switch “OFF” and wait at least 5 seconds.
4) Start engine and wait at least 12 seconds.
5) Select “MODE 7” with GST.
6) If 1st trip DTC is detected, go to “DIAGNOSTIC
PROCEDURE”, EC-323.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1) Start engine and warm it up to normal operating tem-
perature.
2) Check that voltage between ECM terminal
q
92
and
ground is less than 4.2V.
3) Turn ignition switch “OFF” and wait at least 5 seconds.
4) Start engine and wait at least 12 seconds.
5) Turn ignition switch “OFF”, wait at least 5 seconds and
then turn “ON”.
6) Perform “Diagnostic Test Mode II (Self-diagnostic
results)” with ECM.
7) If 1st trip DTC is detected, go to “DIAGNOSTIC
PROCEDURE”, EC-323.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0450
Evaporative Emission (EVAP) Control System
Pressure Sensor (Cont’d)
EC-321
TEC059M
TROUBLE DIAGNOSIS FOR DTC P0450
Evaporative Emission (EVAP) Control System
Pressure Sensor (Cont’d)
EC-322
SEF427U
SEF377U
SEF410Q
SEF411Q
SEF832U
DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK RUBBER TUBE CONNECTED
TO THE SENSOR.
Check rubber tube for clogging, bending,
kinking, disconnection or improper con-
nection.
OK
E
NG
Reconnect, repair or
replace.
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground
screw.
CHECK POWER SUPPLY.
1. Disconnect EVAP control system pres-
sure sensor harness connector.
2. Check sensor harness connector for
water.
Water should not exist.
If OK, go to step 3. If NG, repair or
replace harness or connectors.
3. Turn ignition switch “ON”.
4. Check voltage between terminal
q
3
and
engine ground with CONSULT-II or
tester.
Voltage: Approximately 5V
OK
E
NG
Check the following.
I
Harness or connectors
F64
,
B102
I
Harness or connectors
B178
,
B65
I
Harness connectors
B64
,
C14
I
Harness for open or
short between EVAP
control system pressure
sensor and ECM
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch “OFF”.
2. Check harness continuity between ter-
minal
q
1
and engine ground.
Continuity should exist.
If OK, check harness for short to power.
OK
E
NG
Check the following.
I
Harness or connectors
F64
,
B102
I
Harness or connectors
B178
,
B65
I
Harness connectors
B64
,
C14
I
Harness for open or
short between EVAP
control system pressure
sensor and ECM
If NG, repair open circuit or
short to power in harness
or connectors.
CHECK INPUT SIGNAL CIRCUIT.
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM
terminal
q
92
and terminal
q
2
.
Continuity should exist.
If OK, check harness for short to
ground and short to power.
OK
E
NG
Check the following.
I
Harness connectors
I
Harness or connectors
F64
,
B102
I
Harness or connectors
B178
,
B65
I
Harness connectors
B64
,
C14
I
Harness for open or
short between ECM
and EVAP control sys-
tem pressure sensor
If NG, repair open circuit
or short to ground or
short to power in har-
ness or connectors.
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 P0450
Evaporative Emission (EVAP) Control System
Pressure Sensor (Cont’d)
H
H
H
H
H
H
EC-323
SEF596U
q
A
CHECK COMPONENT
(EVAP canister purge volume control
valve).
Refer to “COMPONENT INSPECTION”,
EC-304.
OK
E
NG
Replace EVAP canister
purge volume control
valve.
CHECK COMPONENT
(EVAP canister vent control valve).
Refer to “COMPONENT INSPECTION”,
EC-319.
OK
CHECK COMPONENT
(EVAP control system pressure sensor).
Refer to “COMPONENT INSPECTION”
below.
OK
E
NG
Replace EVAP control sys-
tem pressure sensor.
CHECK RUBBER TUBE FOR CLOG-
GING.
Check obstructed water separator and
rubber tube to EVAP canister vent control
valve and clean the rubber tube using air
blower.
For water separator, refer to “COMPO-
NENT INSPECTION”, EC-441.
OK
E
NG
Clean, repair or replace
rubber tube and/or water
separator.
CHECK IF EVAP CANISTER IS SATU-
RATED WITH WATER.
1. Remove EVAP canister with EVAP can-
ister vent control valve attached.
2. Check if water will drain from the EVAP
canister. If it will, weigh the EVAP canis-
ter 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-306.
Perform “TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT”, EC-117.
INSPECTION END
TROUBLE DIAGNOSIS FOR DTC P0450
Evaporative Emission (EVAP) Control System
Pressure Sensor (Cont’d)
H
H
H
H
H
H
H
EC-324
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