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Infiniti Q45 (FY33). Manual - part 230

SEF353Q

SEC049C

SEF763P

SEF593U

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

and terminals

terminal

and terminals

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

and terminals

terminal

and terminals

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.

IDX

TROUBLE DIAGNOSIS FOR DTC P1444

Evaporative Emission (EVAP) Canister Purge
Volume Control Valve (Cont’d)

EC-449

SEF357W

SEF799W

COMPONENT INSPECTION

EVAP control system pressure sensor

Remove EVAP control system pressure sensor with its har-
ness connector connected.

Remove hose from EVAP control system pressure sensor.

Turn ignition switch “ON”.

Use pump to apply vacuum and pressure to EVAP control
system pressure sensor as shown in figure.

Check output voltage between ECM terminal

and ground.

Pressure (Relative to atmospheric pressure)

Voltage (V)

0 kPa (0 mmHg, 0 inHg)

3.0 - 3.6

−9.3 kPa (−70 mmHg, −2.76 inHg)

0.4 - 0.6

CAUTION:

Always calibrate the vacuum pump gauge when using it.

Do not apply below −20 kPa (−150 mmHg, −5.91 inHg) or
over 20 kPa (150 mmHg, 5.91 inHg) of pressure.

If NG, replace EVAP control system pressure sensor.

Never apply force to the air hole protector of the sensor,
if equipped.

Discard any EVAP control system pressure sensor which
has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new
one.

SEC050C

AEC783A

EVAP canister vent control valve

Check air passage continuity.

Perform “VENT CONTROL/V” in “ACTIVE TEST” mode with
CONSULT-II.

Condition

VENT CONTROL/V

Air passage continuity

between

and

OFF

Yes

Condition

Air passage continuity

between

and

12V direct current supply between ter-
minals

and

No supply

Yes

If NG or operation takes more than 1 second, clean valve using air
blower or replace as necessary.

TROUBLE DIAGNOSIS FOR DTC P1444

Evaporative Emission (EVAP) Canister Purge
Volume Control Valve (Cont’d)

EC-450

If the portion

is rusted, replace EVAP canister vent control

valve.
Make sure new O-ring is installed properly.

IDX

TROUBLE DIAGNOSIS FOR DTC P1444

Evaporative Emission (EVAP) Canister Purge
Volume Control Valve (Cont’d)

EC-451

SEF419U

Evaporative Emission (EVAP) Canister Vent
Control Valve (Close)

COMPONENT DESCRIPTION

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

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)

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)

P1446
0215

EVAP canister vent control valve remains closed
under specified driving conditions.

EVAP canister vent control valve

EVAP control system pressure sensor and the circuit

Blocked rubber tube to EVAP canister vent control
valve

Water separator

EVAP canister is saturated with water.

TROUBLE DIAGNOSIS FOR DTC P1446

EC-452

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