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Infiniti Q45 (FY33). Manual - part 227

SEF594U

SEF765X

SEF597U

SEF406W

SEF394WA

CHECK COMPONENT (EVAP canister
purge control solenoid valve).

1. Disconnect vacuum hose to

EVAP canister purge control
solenoid valve.

2. Start engine.
3. Perform “PURG CONT S/V” in

“ACTIVE TEST” mode.

4. Select “ON” on CONSULT-II

screen to turn on “PURG CONT
S/V”.

5. Check vacuum hose for vacuum

when revving engine up to 2,000
rpm.
Vacuum should 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. Start engine and let it idle for at

least 60 seconds.

5. Check vacuum hose for vacuum

when revving engine up to 2,000
rpm.
Vacuum should exist.

Check the following.

EVAP canister purge con-
trol solenoid valve
Refer to “COMPONENTS
INSPECTION”, EC-440.

Vacuum hoses for clog-
ging or disconnection.
Refer to “Vacuum Hose
Drawing”, EC-29.

CHECK COMPONENT
(Absolute pressure sensor).
Refer to “COMPONENT INSPECTION”,
EC-442.

Replace absolute pressure
sensor.

CHECK COMPONENT
(MAP/BARO switch solenoid valve).
Refer to “COMPONENT INSPECTION”,
EC-442.

Replace MAP/BARO
switch solenoid valve.

CHECK COMPONENT
(Fuel tank temperature sensor).
Refer to “COMPONENT INSPECTION”,
EC-443.

Replace fuel tank tempera-
ture sensor.

CHECK COMPONENT.
Check EVAP purge line (pipe, rubber tube,
fuel tank and EVAP canister) for cracks or
improper connection.
Refer to “Evaporative Emission Line
Drawing”, EC-29.

Repair or reconnect the
hose.

(Go to next page.)

IDX

TROUBLE DIAGNOSIS FOR DTC P1440

Evaporative Emission (EVAP) Control System
(Small Leak) (Positive Pressure) (Cont’d)

EC-437

CHECK COMPONENT
(EVAP control system pressure sensor).
Refer to “COMPONENT INSPECTION”,
EC-325.

Replace EVAP control sys-
tem pressure sensor.

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

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

INSPECTION END

TROUBLE DIAGNOSIS FOR DTC P1440

Evaporative Emission (EVAP) Control System
(Small Leak) (Positive Pressure) (Cont’d)

EC-438

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 P1440

Evaporative Emission (EVAP) Control System
(Small Leak) (Positive Pressure) (Cont’d)

EC-439

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 than 1 second, replace solenoid
valve.

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

TROUBLE DIAGNOSIS FOR DTC P1440

Evaporative Emission (EVAP) Control System
(Small Leak) (Positive Pressure) (Cont’d)

EC-440

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