Infiniti QX56 (Z62). Manual - part 585

EC-318

< DTC/CIRCUIT DIAGNOSIS >

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P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Which is displayed on CONSULT-III screen?

OK

>> INSPECTION END

NG

>> Proceed to 

EC-318, "Diagnosis Procedure"

.

4.

PERFORM DTC CONFIRMATION PROCEDURE A

WITH GST

1.

Turn ignition switch ON.

2.

Set voltmeter probes to ECM harness connector terminals.

3.

Start engine and wait at least 60 seconds.

4.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Proceed to 

EC-318, "Diagnosis Procedure"

.

NO

>> GO TO 5.

5.

PERFORM DTC CONFIRMATION PROCEDURE B

WITH GST

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Turn ignition switch ON.

4.

Turn ignition switch OFF and wait at least 10 seconds.

5.

Start engine and let it idle for at least 20 seconds.

6.

Check 1st trip DTC.

Is 1st trip DTC displayed?

YES

>> Proceed to 

EC-318, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006288308

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

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

ECM

Voltage (V)

Connector

+

–

Terminal

Terminal

E80

134

(Fuel tank temperature sensor signal)

175

(Sensor ground)

3.1 - 4.0

EVAP canister purge volume control solenoid valve

Ground

Voltage

Connector

Terminal

F48

1

Ground

Battery voltage

P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

EC-319

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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

>> GO TO 4.

NO

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

4.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR

1.

Disconnect EVAP control system pressure sensor harness connector.

2.

Check that water is not inside connectors.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace EVAP control system pressure sensor.

5.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-335, "Component Inspection (EVAP Control System Pressure Sensor)"

.

Is the inspection result normal?

YES-1 >> With CONSULT-III: GO TO 6.
YES-2 >> Without CONSULT-III: GO TO 7.
NO

>> Replace EVAP control system pressure sensor.

6.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

 WITH CONSULT-III

1.

Turn ignition switch OFF.

2.

Reconnect harness connectors disconnected.

3.

Start engine.

4.

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 8.

NO

>> GO TO 7.

7.

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 8.

NO

>> Replace EVAP canister purge volume control solenoid valve. Refer to 

FL-10, "Exploded View"

.

8.

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 9.

NO

>> Clean the rubber tube using an air blower.

9.

CHECK EVAP CANISTER VENT CONTROL VALVE

Refer to 

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

.

EVAP canister purge volume control solenoid valve

ECM

Continuity

Connector

Terminal

Connector

Terminal

F48

2

F110

64

Existed

EC-320

< DTC/CIRCUIT DIAGNOSIS >

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P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Replace EVAP canister vent control valve. Refer to 

FL-10, "Exploded View"

.

10.

CHECK IF EVAP CANISTER IS SATURATED WITH WATER

1.

Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor
attached.

2.

Check if water will drain from EVAP canister (1).

-

EVAP canister vent control valve (2)

Does water drain from the EVAP canister?

YES

>> GO TO 11.

NO

>> GO TO 13.

11.

CHECK EVAP CANISTER

Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor
attached.
The weight should be less than 2.5 kg (5.5 lb).

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> GO TO 12.

12.

DETECT MALFUNCTIONING PART

Check the following.
• EVAP canister for damage
• EVAP hose between EVAP canister and vehicle frame for clogging or poor connection

>> Repair hose or replace EVAP canister. Refer to 

FL-10, "Hydraulic Layout"

.

13.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection (EVAP Canister Purge Volume Control Solenoid Valve)

INFOID:0000000006288309

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.

JSBIA0692ZZ

P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

EC-321

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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