Infiniti QX56 (Z62). Manual — part 586

EC-322

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID

VALVE

P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE

DTC Logic

INFOID:0000000006217854

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:
Before performing the following procedure, confirm battery voltage is 11 V or more at idle.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and let it idle for at least 13 seconds.

2.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to

EC-322, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006217855

1.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect EVAP canister purge volume control solenoid valve harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between EVAP canister purge volume control solenoid valve harness connector and
ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

DETECT MALFUNCTIONING PART

Check the following.
• Loose or poor connection for each connector and harness
• Harness for open or short between EVAP canister purge volume control solenoid valve and IPDM E/R

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0444

PURG VOLUME CONT/V
(EVAP canister purge volume
control solenoid valve circuit
open)

An excessively low voltage signal is
sent to ECM through the valve

• Harness or connectors

(The solenoid valve circuit is open or shorted.)

• EVAP canister purge volume control solenoid

valve

P0445

PURG VOLUME CONT/V
(EVAP canister purge volume
control solenoid valve circuit
shorted)

An excessively high voltage signal is
sent to ECM through the valve

• Harness or connectors

(The solenoid valve circuit is shorted.)

• EVAP canister purge volume control solenoid

valve

EVAP canister purge volume

control solenoid valve

Ground

Voltage

Connector

Terminal

F48

1

Ground

Battery voltage

P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID

VALVE

EC-323

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

• Harness for open or short between EVAP canister purge volume control solenoid valve and ECM

>> Repair open circuit, short to ground or short to power in harness or connectors.

3.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT

FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between EVAP canister purge volume control solenoid valve harness connector and
ECM harness connector.

4.

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES-1 >> With CONSULT-III: GO TO 4.
YES-2 >> Without CONSULT-III: GO TO 5.
NO

>> Repair open circuit, short to ground or short to power in harness or connectors.

4.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

WITH CONSULT-III

1.

Reconnect all harness connectors disconnected.

2.

Start engine.

3.

Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT-III. Check that engine speed var-
ies according to the valve opening.

Does engine speed vary according to the valve opening?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to

EC-320, "Component Inspection (EVAP Canister Purge Volume Control Solenoid Valve)"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace EVAP canister purge volume control solenoid valve.

6.

CHECK INTERMITTENT INCIDENT

Refer to

GI-40, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection (EVAP Canister Purge Volume Control Solenoid Valve)

INFOID:0000000006288361

1.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

WITH CONSULT-III

1.

Turn ignition switch OFF.

2.

Reconnect all harness connectors disconnected.

3.

Disconnect EVAP purge hoses connected to EVAP canister purge volume control solenoid valve.

4.

Turn ignition switch ON.

5.

Select “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT-III.

EVAP canister purge volume

control solenoid valve

ECM

Continuity

Connector

Terminal

Connector

Terminal

F48

2

F110

64

Existed

EC-324

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID

VALVE

6.

Touch “Qd” and “Qu” on CONSULT-III screen to adjust “PURG
VOL C/V” opening and check air passage continuity of EVAP
canister purge volume control solenoid valve under the following
conditions.

WITHOUT CONSULT-III

1.

Turn ignition switch OFF.

2.

Disconnect EVAP canister purge volume control solenoid valve harness connector.

3.

Disconnect EVAP purge hoses connected to EVAP canister purge volume control solenoid valve.

4.

Check air passage continuity of EVAP canister purge volume
control solenoid valve under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace EVAP canister purge volume control solenoid

valve. Refer to

FL-10, "Hydraulic Layout"

.

Condition

(PURG VOL C/V value)

Air passage continuity

between (A) and (B)

100%

Existed

0%

Not existed

JMBIA0068ZZ

Condition

Air passage continuity

between (A) and (B)

12 V direct current supply between
terminals 1 and 2

Existed

No supply

Not existed

JMBIA0068ZZ

P0447 EVAP CANISTER VENT CONTROL VALVE

EC-325

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

P0447 EVAP CANISTER VENT CONTROL VALVE

DTC Logic

INFOID:0000000006288310

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:
Before performing the following procedure, confirm battery voltage is 11 V or more at idle.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and wait at least 8 seconds.

2.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Proceed to

EC-325, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006288311

1.

INSPECTION START

Will CONSULT-III be used?

Will CONSULT-III be used?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

CHECK EVAP CANISTER VENT CONTROL VALVE CIRCUIT

WITH CONSULT-III

1.

Turn ignition switch OFF and then ON.

2.

Select “VENT CONTROL/V” in “ACTIVE TEST” mode with CONSULT-III.

3.

Touch “ON/OFF” on CONSULT-III screen.

4.

Check for operating sound of the valve.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 3.

3.

CHECK EVAP CANISTER VENT CONTROL VALVE POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect EVAP canister vent control valve harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between EVAP canister vent control valve harness connector and ground.

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0447

VENT CONTROL VALVE
(EVAP canister vent control
valve circuit open)

An improper voltage signal is sent to ECM
through EVAP canister vent control valve.

• Harness or connectors

(The valve circuit is open or shorted.)

• EVAP canister vent control valve

Clicking sound should be heard.