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Infiniti Q45 (FY33). Manual - part 233

SEF600U

SEF594U

SEF427U

SEF419U

CHECK COMPONENT
(EVAP canister purge control solenoid
valve).
Refer to “COMPONENT INSPECTION”,
EC-463.

Replace EVAP canister
purge control solenoid
valve.

CHECK COMPONENT
(EVAP canister purge control valve).
Refer to “COMPONENT INSPECTION”,
EC-463.

Replace EVAP canister
purge control valve.

CHECK COMPONENT AND CIRCUIT
(EVAP control system pressure sensor).
1. Check disconnection of hose connected

to the sensor.

2. Check sensor harness connector for

water.
Water should not exist.
If OK, go to step 3.

3. Check EVAP control system pressure

sensor. Refer to “COMPONENT
INSPECTION”, EC-320.

Replace EVAP control sys-
tem pressure sensor and
repair or replace harness
and connector.

CHECK COMPONENT
(EVAP canister vent control valve and
O-ring).
Refer to “COMPONENT INSPECTION”,
EC-455.

Replace EVAP canister
vent control valve and
O-ring.

CHECK EVAP PURGE LINE.
Inspect EVAP purge line (pipe and rubber
tube). Check for evidence of leaks.

Replace it.

Clean EVAP purge line (pipe and rubber
tube) using air blower.

Perform “TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT”, EC-117.

INSPECTION END

IDX

TROUBLE DIAGNOSIS FOR DTC P1447

Evaporative Emission (EVAP) Control System
Purge Flow Monitoring (Cont’d)

EC-461

SEF353Q

SEC049C

SEF763P

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.

SEF593U

TROUBLE DIAGNOSIS FOR DTC P1447

Evaporative Emission (EVAP) Control System
Purge Flow Monitoring (Cont’d)

EC-462

SEF809W

EVAP canister purge control valve

Check EVAP canister purge control valve as follows:
1.

Blow air in port

and

, then ensure that there is no leak-

age.

Blow air in port

, then ensure that there is a resistance to flow

out of port

Apply vacuum to port

. [Approximately −13.3 to −20.0 kPa

(−100 to −150 mmHg, −3.94 to −5.91 inHg)]
Blow air in port

and ensure free flow out of port

SEF765X

SEF400W

SEF313Q

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

Check air passage continuity.

Condition

Air passage

continuity

between

and

Air passage

continuity

between

and

12V direct current supply
between terminals

Yes

No supply

Yes

If NG or operation takes more 1 second, replace solenoid valve.

AEC140A

One-way valve

Check one-way valve air passage continuity.

Condition

Air passage continuity

Blow air into side B to A

Yes

Blow air into side A to B

If NG, replace one-way valve.
Make sure to install one-way valve with the colored side fac-
ing the vacuum.

IDX

TROUBLE DIAGNOSIS FOR DTC P1447

Evaporative Emission (EVAP) Control System
Purge Flow Monitoring (Cont’d)

EC-463

SEF378Q

SEF419U

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

COMPONENT DESCRIPTION

NOTE:
If DTC P1448 is displayed with P0440, P1440, perform
TROUBLE DIAGNOSIS FOR DTC P1448 first.
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)

P1448
0309

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

EVAP canister vent control valve

EVAP control system pressure sensor

Blocked rubber tube to EVAP canister vent control
valve

Water separator

EVAP canister is saturated with water.

Vacuum cut valve

TROUBLE DIAGNOSIS FOR DTC P1448

EC-464

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