Infiniti F50. Manual - part 424

DTC P0442 EVAP CONTROL SYSTEM

EC-337

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EC

14. 

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

 Without CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Stop engine.

3.

Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port.

4.

Start engine and let it idle for at least 80 seconds.

5.

Check vacuum hose for vacuum when revving engine up to 2,000 rpm.

OK or NG

OK

>> GO TO 17.

NG

>> GO TO 15.

15. 

CHECK VACUUM HOSE

Check vacuum hoses for clogging or disconnection. Refer to 

EC-24, "Vacuum Hose Drawing"

 .

OK or NG

OK

>> GO TO 16.

NG

>> Repair or reconnect the hose.

16. 

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to 

EC-544, "Component Inspection"

 .

OK or NG

OK

>> GO TO 17.

NG

>> Replace EVAP canister purge volume control solenoid valve.

17. 

CHECK FUEL TANK TEMPERATURE SENSOR

Refer to 

EC-286, "Component Inspection"

 .

OK or NG

OK

>> GO TO 18.

NG

>> Replace fuel level sensor unit.

18. 

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-357, "Component Inspection"

 .

OK or NG

OK

>> GO TO 19.

NG

>> Replace EVAP control system pressure sensor.

19. 

CHECK EVAP PURGE LINE

Check EVAP purge line (pipe, rubber tube, fuel tank and EVAP canister) for cracks or improper connection.
Refer to 

EC-685, "EVAPORATIVE EMISSION LINE DRAWING"

 .

OK or NG

OK

>> GO TO 20.

NG

>> Repair or reconnect the hose.

20. 

CLEAN EVAP PURGE LINE

Clean EVAP purge line (pipe and rubber tube) using air blower.

>> GO TO 21.

Vacuum should exist.

EC-338

DTC P0442 EVAP CONTROL SYSTEM

21. 

CHECK REFUELING EVAP VAPOR LINE

Check refuelling EVAP vapor line between EVAP canister and fuel tank for clogging, kink, looseness and
improper connection. For location, refer to 

EC-690, "ON BOARD REFUELING VAPOR RECOVERY (ORVR)"

.
OK or NG

OK

>> GO TO 22.

NG

>> Repair or replace hoses and tubes.

22. 

CHECK SIGNAL LINE AND RECIRCULATION LINE

Check signal line and recirculation line between filler neck tube and fuel tank for clogging, kink, cracks, loose-
ness and improper connection.
OK or NG

OK

>> GO TO 23.

NG

>> Repair or replace hose, tube or filler neck tube.

23. 

CHECK REFUELING CONTROL VALVE

Refer to 

EC-693, "Component Inspection"

 .

OK or NG

OK

>> GO TO 24.

NG

>> Replace refueling EVAP vapor cut valve with fuel tank. 

24. 

CHECK FUEL LEVEL SENSOR

Refer to 

DI-26, "CHECK FUEL LEVEL SENSOR UNIT"

 .

OK or NG

OK

>> GO TO 25.

NG

>> Replace fuel level sensor unit.

25. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

EBS00MEH

WATER SEPARATOR

1.

Check visually for insect nests in the water separator air inlet.

2.

Check visually for cracks or flaws in the appearance.

3.

Check visually for cracks or flaws in the hose.

4.

Check that A  and C  are not clogged by blowing air into B  with
A , and then C  plugged.

5.

In case of NG in items 2 - 4, replace the parts.

NOTE:

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Do not disassemble water separator.

PBIB1032E

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID 

VALVE

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EC

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE

PFP:14920

Description

EBS00MEI

SYSTEM DESCRIPTION 

*: This signal is sent to the ECM through CAN communication.

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.

CONSULT-II Reference Value in Data Monitor Mode

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Specification data are reference values.

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 volume 
control solenoid valve

Mass air flow sensor

Amount of intake air

Engine coolant temperature sensor

Engine coolant temperature

Ignition switch

Start signal

Throttle position sensor

Throttle position

Accelerator pedal position sensor

Accelerator pedal position

Heated oxygen sensors 1

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

Fuel tank temperature sensor

Fuel temperature in fuel tank

Wheel sensor*

Vehicle speed

SEF337U

MONITOR ITEM

CONDITION

SPECIFICATION

PURG VOL C/V

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Engine: After warming up

●

Selector lever: P or N

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Air conditioner switch: OFF

●

No-load

Idle

0%

2,000 rpm

—

EC-340

DTC P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID 

VALVE

On Board Diagnosis Logic

EBS00MEK

DTC Confirmation Procedure

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NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch “OFF” and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm battery voltage is more than 11V at idle.

 WITH CONSULT-II

1.

Turn ignition switch “ON”.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

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

4.

If 1st trip DTC is detected, go to 

EC-342, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT-II” above. 

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 
solenoid 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 
solenoid valve

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