Infiniti QX56 (JA60). Manual - part 393

EC-224

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[VK56DE]

P0442 EVAP CONTROL SYSTEM

NG

>> Replace fuel level sensor unit.

24.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-35, "How to Check Terminal"

 and 

GI-38, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000005149241

FUEL TANK VACUUM RELIEF VALVE (BUILT INTO FUEL FILLER CAP)

1. Wipe clean valve housing.

2. Check valve opening pressure and vacuum.

3. If out of specification, replace fuel filler cap as an assembly.

CAUTION:

Use only a genuine fuel filler cap as a replacement. If an incor-

rect fuel filler cap is used, the MIL may come on.

SEF445Y

Pressure: 15.3 - 20.0 kPa (0.156 - 0.204 kg/cm

2

, 2.22 - 

2.90 psi)

Vacuum:

−6.0 to −3.3 kPa (−0.061 to −0.034 kg/cm

2

, 

−0.87 to −0.48 psi)

SEF943S

P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

EC-225

< COMPONENT DIAGNOSIS >

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P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Description

INFOID:0000000005149242

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:0000000005167699

Sensor

Input signal to ECM

ECM function

Actuator

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

Engine speed*

1

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*

1

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*

2

PBIB2057E

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

P0443
0443

EVAP canister purge 
volume control sole-
noid valve

A)

The canister purge flow is detected during the 
vehicle is stopped while the the engine is run-
ning, even when EVAP canister purge volume 
control solenoid valve is completely closed.

• EVAP control system pressure sensor
• EVAP canister purge volume control so-

lenoid valve
(The valve is stuck open.)

• EVAP canister vent control valve
• EVAP canister
• Hoses

(Hoses are connected incorrectly or 
clogged.)

B)

The canister purge flow is detected during the 
specified driving conditions, even when EVAP 
canister purge volume control solenoid valve 
is completely closed.

EC-226

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[VK56DE]

P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

DTC Confirmation Procedure

INFOID:0000000005167700

Perform PROCEDURE FOR MALFUNCTION A first.

If the DTC cannot be confirmed, perform PROCEDURE FOR MALFUNCTION B.

NOTE:

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure

before conducting the next step.
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.

PROCEDURE FOR MALFUNCTION A

TESTING CONDITION:

• Perform “DTC CONFIRMATION PROCEDURE” when the fuel level is between 1/4 and 3/4 full, and

vehicle is placed on flat level surface.

• Always perform test at a temperature of 5 to 60

°C (41°F).

• Cool the vehicle so that engine coolant temperature becomes same level as ambient temperature.

With CONSULT-III

1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-III.

2. Check that the following condition are met.

FUEL T/TMP SE: 0 – 35

°C (32 – 95°F)

3. Start engine and wait at least 60 seconds.

4. Check 1st trip DTC.

5. If 1st trip DTC is detected, go to 

EC-227, "Diagnosis Procedure"

.

With GST

1. Turn ignition switch ON.

2. Set voltmeter probes to ECM terminal 107 (FTT sensor signal)

and ground.

3. Check that the voltage is 3.1 – 4.2 V.

4. Start engine and wait at least 60 seconds.

5. Check 1st trip DTC.

6. If 1st trip DTC is detected, go to 

EC-227, "Diagnosis Procedure"

.

PROCEDURE FOR MALFUNCTION B

NOTE:

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-

ing the next step.
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:

Always perform test at a temperature of 5

°C (41°F) or more.

With CONSULT-III

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. Turn ignition switch ON.

6. Select “PURG VOL CN/V P1444” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” mode with

CONSULT-III.

7. Touch “START”.

JMBIA2925ZZ

P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

EC-227

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8. Start engine and let it idle until “TESTING” on CONSULT-III changes to “COMPLETED”. (It will take

approximately 10 seconds.)

If “TESTING” is not displayed after 5 minutes, retry from step 2.

9. Make sure that “OK” is displayed after touching “SELF-DIAG RESULTS”. If “NG” is displayed, refer to 

EC-

227, "Diagnosis Procedure"

.

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. Select Service $07 with GST.

7. If 1st trip DTC is detected, go to 

EC-227, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005149245

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 voltage between EVAP canister purge volume control

solenoid valve terminal 1 and ground with CONSULT-III or

tester.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 2.

2.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E2, F32

• 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

>> Repair 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 harness continuity between ECM terminal 45 and EVAP canister purge volume control solenoid

valve terminal 2. Refer to Wiring Diagram.

BBIA0366E

Voltage: Battery voltage

PBIB2245E

Continuity should exist.