Infiniti QX4 (R50). Manual — part 277

SEF013Z

11) Make sure the following.

Condition

VENT CONTROL/V

Air passage continuity

between A and B

ON

No

OFF

Yes

If the result is NG, go to “Diagnostic Procedure”, EC-577.
If the result is OK, go to “Diagnostic Procedure” for DTC
P0440, EC-355.

AEC783A

Overall Function Check

NBEC0343

Use this procedure to check the overall function of the EVAP can-
ister vent control valve circuit. During this check, a DTC might not
be confirmed.

WITH GST

NBEC0343S01

1)

Disconnect hose from water separator.

2)

Disconnect EVAP canister vent control valve harness connec-
tor.

3)

Verify the following.

Condition

Air passage continuity

12V direct current supply between ter-
minals 1 and 2

No

No supply

Yes

If the result is NG, go to “Diagnostic Procedure”, EC-577.
If the result is OK, go to “Diagnostic Procedure” for DTC
P0440, EC-355.

GI

MA

EM

LC

FE

AT

TF

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

DTC P1448 EVAPORATIVE EMISSION (EVAP) CANISTER VENT CONTROL

VALVE (OPEN)

DTC Confirmation Procedure (Cont’d)

EC-575

Wiring Diagram

NBEC0344

MEC963C

DTC P1448 EVAPORATIVE EMISSION (EVAP) CANISTER VENT CONTROL

VALVE (OPEN)

Wiring Diagram

EC-576

Diagnostic Procedure

NBEC0345

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 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 3.

NG

©

Replace EVAP canister vent control valve.

GI

MA

EM

LC

FE

AT

TF

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

DTC P1448 EVAPORATIVE EMISSION (EVAP) CANISTER VENT CONTROL

VALVE (OPEN)

Diagnostic Procedure

EC-577

3

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 5.

NG

©

GO TO 4.

4

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 Test No. 3 again.

OK or NG

OK

©

GO TO 5.

NG

©

Replace EVAP canister vent control valve.

DTC P1448 EVAPORATIVE EMISSION (EVAP) CANISTER VENT CONTROL

VALVE (OPEN)

Diagnostic Procedure (Cont’d)

EC-578