Infiniti QX56 (Z62). Manual - part 587

 

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Infiniti QX56 (Z62). Manual - part 587

 

 

EC-326

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P0447 EVAP CANISTER VENT CONTROL VALVE

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

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

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

5.

CHECK EVAP CANISTER VENT CONTROL 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 vent control valve harness connector and ECM harness con-
nector.

4.

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

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

Check the following.
• Loose or poor connection for each connector and harness
• Harness for open or short between EVAP canister vent control valve and ECM

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

7.

CHECK RUBBER TUBE FOR CLOGGING

1.

Disconnect rubber tube connected to EVAP canister vent control valve.

2.

Check the rubber tube for clogging.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Clean the rubber tube using an air blower.

8.

CHECK EVAP CANISTER VENT CONTROL VALVE

Refer to 

EC-327, "Component Inspection (EVAP Canister Vent Control Valve)"

.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Replace EVAP canister vent control valve. Refer to 

FL-10, "Exploded View"

.

9.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

EVAP canister vent 

control valve

Ground

Voltage

Connector

Terminal

C18

1

Ground

Battery voltage

EVAP canister vent 

control valve

ECM

Continuity

Connector

Terminal

Connector

Terminal

C18

2

E80

120

Existed

P0447 EVAP CANISTER VENT CONTROL VALVE

EC-327

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

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Component Inspection (EVAP Canister Vent Control Valve)

INFOID:0000000006288312

1.

CHECK EVAP CANISTER VENT CONTROL VALVE-I

1.

Turn ignition switch OFF.

2.

Remove EVAP canister vent control valve from EVAP canister.

3.

Check portion (A) of EVAP canister vent control valve for rust.

Is it rusted?

YES

>> Replace EVAP canister vent control valve. Refer to 

FL-

10, "Exploded View"

.

NO

>> GO TO 2.

2.

CHECK EVAP CANISTER VENT CONTROL VALVE-II

 WITH CONSULT-III

1.

Reconnect harness connectors disconnected.

2.

Turn ignition switch ON.

3.

Perform “VENT CONTROL/V” in “ACTIVE TEST” mode.

4.

Check air passage continuity and operation delay time.
Check that new O-ring is installed properly.

Operation takes less than 1 second.

 WITHOUT CONSULT-III

1.

Disconnect EVAP canister vent control valve harness connector.

2.

Check air passage continuity and operation delay time under the following conditions.
Check that new O-ring is installed properly.

Operation takes less than 1 second.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace EVAP canister vent control valve. Refer to 

FL-10, "Exploded View"

.

3.

CHECK EVAP CANISTER VENT CONTROL VALVE-III

 WITH CONSULT-III

1.

Clean the air passage [portion (A) to (B)] of EVAP canister vent control valve using an air blower.

2.

Perform “VENT CONTROL/V” in “ACTIVE TEST” mode.

JSBIA0693ZZ

VENT CONTROL/V Condition

Air passage continuity between (A) and (B)

ON

Not existed

OFF

Existed

JSBIA0694ZZ

Condition

Air passage continuity between (A) and (B)

12 V direct current supply between
 terminals 1 and 2

Not existed

OFF

Existed

EC-328

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P0447 EVAP CANISTER VENT CONTROL VALVE

3.

Check air passage continuity and operation delay time.
Check that new O-ring is installed properly.

Operation takes less than 1 second.

 WITHOUT CONSULT-III

1.

Clean the air passage [portion (A) to (B)] of EVAP canister vent control valve using an air blower.

2.

Check air passage continuity and operation delay time under the following conditions.
Check that new O-ring is installed properly.

Operation takes less than 1 second.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace EVAP canister vent control valve. Refer to 

FL-10, "Exploded View"

.

VENT CONTROL/V Condition

Air passage continuity between (A) and (B)

ON

Not existed

OFF

Existed

JSBIA0694ZZ

Condition

Air passage continuity between (A) and (B)

12 V direct current supply between
 terminals 1 and 2

Not existed

OFF

Existed

P0448 EVAP CANISTER VENT CONTROL VALVE

EC-329

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

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P0448 EVAP CANISTER VENT CONTROL VALVE

DTC Logic

INFOID:0000000006288313

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.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON and wait at least 5 seconds.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Start engine and let it idle for at least 1 minute. 

4.

Repeat next procedures 3 times.

-

Increase the engine speed up to between 3,000 and 3,500 rpm and maintain that speed for 2 minutes and
50 seconds to 3 minutes.

Do not exceed 3 minutes.

-

Fully released accelerator pedal and keep engine idle for approximately 5 seconds.

5.

Repeat next procedure 20 times.

-

Quickly increase the engine speed up to between 4,000 and 4,500 rpm and maintain that speed for 25 to
30 seconds.

-

Fully released accelerator pedal and keep engine idle for at least 35 seconds.

6.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Proceed to 

EC-329, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006288314

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.

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0448

VENT CONTROL VALVE
(EVAP canister vent control 
valve close)

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

• EVAP canister vent control valve
• EVAP control system pressure sensor 

and the circuit

• Blocked rubber tube to EVAP canister 

vent control valve

• EVAP canister is saturated with water

JMBIA1516GB

 

 

 

 

 

 

 

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