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Infiniti QX56 (JA60). Manual - part 394

EC-228

< COMPONENT DIAGNOSIS >

[VK56DE]

P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

4. Also check harness for short to ground and short to power.
OK or NG

>> GO TO 4.

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

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR

1. Disconnect EVAP control system pressure sensor harness connector.

2. Check connectors for water.

OK or NG

>> GO TO 5.

>> Replace EVAP control system pressure sensor.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to

EC-243, "Component Inspection"

OK or NG

OK (With CONSULT-III)>>GO TO 6.

OK (Without CONSULT-III)>>GO TO 7.

>> Replace EVAP control system pressure sensor.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

With CONSULT-III

1. Turn ignition switch OFF.

2. Reconnect all 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.

OK or NG

>> GO TO 8.

>> GO TO 7.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to

EC-229, "Component Inspection"

OK or NG

>> GO TO 8.

>> Replace EVAP canister purge volume control solenoid valve.

CHECK RUBBER TUBE FOR CLOGGING

1. Disconnect rubber tube connected to EVAP canister vent control valve.

2. Check the rubber tube for clogging.
OK or NG

>> GO TO 9.

>> Clean the rubber tube using an air blower.

CHECK EVAP CANISTER VENT CONTROL VALVE

Refer to

EC-236, "Component Inspection"

OK or NG

>> GO TO 10.

>> Replace EVAP canister vent control valve.

10.

CHECK IF EVAP CANISTER SATURATED WITH WATER

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

attached.

Water should not exist.

P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

EC-229

< COMPONENT DIAGNOSIS >

[VK56DE]

2. Check if water will drain from the EVAP canister.
Yes or No

Yes

>> GO TO 11.

>> 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 3.2 kg (7.1 lb).
OK or NG

>> GO TO 13.

>> 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.

13.

CHECK INTERMITTENT INCIDENT

Refer to

GI-35, "How to Check Terminal"

and

GI-38, "Intermittent Incident"

>> INSPECTION END

Component Inspection

INFOID:0000000005149246

EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

With CONSULT-III

Check air passage continuity of EVAP canister purge volume control

solenoid valve under the following conditions.

Without CONSULT-III

BBIA0351E

Condition

(PURG VOL CONT/V value)

Air passage continuity

between A and B

100%

Yes

PBIB2058E

EC-230

< COMPONENT DIAGNOSIS >

[VK56DE]

P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Check air passage continuity of EVAP canister purge volume control

solenoid valve under the following conditions.

Condition

Air passage continuity

between A and B

12V direct current supply between
terminals 1 and 2

Yes

No supply

PBIB2059E

P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID

VALVE

EC-231

< COMPONENT DIAGNOSIS >

[VK56DE]

P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE

Description

INFOID:0000000005149247

SYSTEM DESCRIPTION

*1: ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to the ECM through CAN communication line.

This system controls flow rate of fuel vapor from the EVAP canister. The opening of the vapor by-pass pas-

sage in the EVAP canister purge volume control solenoid valve changes to control the flow rate. The EVAP

canister purge volume control solenoid valve repeats ON/OFF operation according to the signal sent from the

ECM. The opening of the valve varies for optimum engine control. The optimum value stored in the ECM is

determined by considering various engine conditions. When the engine is operating, the flow rate of fuel vapor

from the EVAP canister is regulated as the air flow changes.

COMPONENT DESCRIPTION

The EVAP canister purge volume control solenoid valve uses a ON/

OFF duty to control the flow rate of fuel vapor from the EVAP canis-

ter. The EVAP canister purge volume control solenoid valve is

moved by ON/OFF pulses from the ECM. The longer the ON pulse,

the greater the amount of fuel vapor that will flow through the valve.

On Board Diagnosis Logic

INFOID:0000000005149248

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed*

EVAP canister
purge flow control

EVAP canister purge vol-
ume control solenoid valve

Mass air flow sensor

Amount of intake air

Engine coolant temperature sensor

Engine coolant temperature

Battery

Battery voltage*

Throttle position sensor

Throttle position

Accelerator pedal position sensor

Accelerator pedal position

Air fuel ratio (A/F) sensor 1

Density of oxygen in exhaust gas
(Mixture ratio feedback signal)

Fuel tank temperature sensor

Fuel temperature in fuel tank

Wheel sensor

Vehicle speed*

PBIB2057E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0444
0444

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 so-

lenoid valve

P0445
0445

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 so-

lenoid valve

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