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:

Always perform test at a temperature above 5°C (41°F).

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

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.

1) Start engine and warm it up to normal operating tem-

perature.

2) Check that voltage between ECM terminal

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.

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.

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

and

engine ground with CONSULT-II or
tester.
Voltage: Approximately 5V

Check the following.

Harness or connectors

F64

B102

Harness or connectors

B178

B65

Harness connectors

B64

C14

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

and engine ground.

Continuity should exist.
If OK, check harness for short to power.

Check the following.

Harness or connectors

F64

B102

Harness or connectors

B178

B65

Harness connectors

B64

C14

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

and terminal

Continuity should exist.
If OK, check harness for short to
ground and short to power.

Check the following.

Harness connectors

Harness or connectors

F64

B102

Harness or connectors

B178

B65

Harness connectors

B64

C14

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.

(Go to next page.)

IDX

TROUBLE DIAGNOSIS FOR DTC P0450

Evaporative Emission (EVAP) Control System
Pressure Sensor (Cont’d)

EC-323

SEF596U

CHECK COMPONENT
(EVAP canister purge volume control
valve).
Refer to “COMPONENT INSPECTION”,
EC-304.

Replace EVAP canister
purge volume control
valve.

CHECK COMPONENT
(EVAP canister vent control valve).
Refer to “COMPONENT INSPECTION”,
EC-319.

CHECK COMPONENT
(EVAP control system pressure sensor).
Refer to “COMPONENT INSPECTION”
below.

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.

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)

→

Less than 1.8 kg (4.0 lb)

→

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)

EC-324

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