Infiniti QX4 (R50). Manual — part 272

Wiring Diagram

NBEC0331

MEC963C

GI

MA

EM

LC

FE

AT

TF

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

DTC P1446 EVAPORATIVE EMISSION (EVAP) CANISTER VENT CONTROL

VALVE (CLOSE)

Wiring Diagram

EC-555

Diagnostic Procedure

NBEC0332

1

CHECK RUBBER TUBE

1. Turn ignition switch “OFF”.
2. Disconnect rubber tube connected to EVAP canister vent control valve.
3. Check the rubber tube for clogging.

SEF143S

OK or NG

OK

©

GO TO 2.

NG

©

Clean rubber tube using an air blower.

2

CHECK WATER SEPARATOR

1. Check visually for insect nests in the water separator air inlet.
2. Check visually for cracks or flaws in the appearance.
3. Check visually for cracks or flaws in the hose.
4. Check that A and C are not clogged by blowing air into B with A, and then C plugged.

SEF829T

5. In case of NG in items 2 - 4, replace the parts.
NOTE:

I

Do not disassemble water separator.

OK or NG

OK

©

GO TO 3.

NG

©

Clean or replace water separator.

DTC P1446 EVAPORATIVE EMISSION (EVAP) CANISTER VENT CONTROL

VALVE (CLOSE)

Diagnostic Procedure

EC-556

3

CHECK EVAP CANISTER VENT CONTROL VALVE-I

1. Remove EVAP canister vent control valve from EVAP canister.
2. Check portion B of EVAP canister vent control valve for being rusted.

SEF337X

OK or NG

OK

©

GO TO 4.

NG

©

Replace EVAP canister vent control valve.

4

CHECK EVAP CANISTER VENT CONTROL VALVE-II

With CONSULT-II

1. Turn ignition switch ON.
2. Perform “VENT CONTROL/V” in “ACTIVE TEST” mode.
3. Check air passage continuity and operation delay time.

SEF991Y

Without CONSULT-II

Check air passage continuity and operation delay time under the following conditions.

SEF339X

Make sure new O-ring is installed properly.

OK or NG

OK

©

GO TO 6.

NG

©

GO TO 5.

GI

MA

EM

LC

FE

AT

TF

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

DTC P1446 EVAPORATIVE EMISSION (EVAP) CANISTER VENT CONTROL

VALVE (CLOSE)

Diagnostic Procedure (Cont’d)

EC-557

5

CHECK EVAP CANISTER VENT CONTROL VALVE-III

1. Clean the air passage (Portion A to B) of EVAP canister vent control valve using an air blower.
2. Perform the procedure 4 again.

OK or NG

OK

©

GO TO 6.

NG

©

Replace EVAP canister vent control valve.

6

CHECK IF EVAP CANISTER SATURATED WITH WATER

1. Remove EVAP canister with EVAP canister vent control valve attached.
2. Check if water will drain from the EVAP canister.

SEF596U

Yes or No

Yes

©

GO TO 7.

No

©

GO TO 9.

7

CHECK EVAP CANISTER

Weigh the EVAP canister with the EVAP canister vent control valve attached.
The weight should be less than 1.8 kg (4.0 lb).

OK or NG

OK

©

GO TO 9.

NG

©

GO TO 8.

8

DETECT MALFUNCTIONING PART

Check the following.

I

EVAP canister for damage

I

EVAP hose between EVAP canister and water separator for clogging or poor connection

©

Repair hose or replace EVAP canister.

9

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR HOSE

Check disconnection or improper connection of hose connected to EVAP control system pressure sensor.

OK or NG

OK

©

GO TO 10.

NG

©

Repair it.

DTC P1446 EVAPORATIVE EMISSION (EVAP) CANISTER VENT CONTROL

VALVE (CLOSE)

Diagnostic Procedure (Cont’d)

EC-558