Nissan Frontier. Manual — part 429

P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID

VALVE

EC-287

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

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P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE

Description

INFOID:0000000009480944

SYSTEM DESCRIPTION

*1: ECM determines the start signal status by the signal 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:0000000009480945

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 volume
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

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

EC-288

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID

VALVE

DTC Confirmation Procedure

INFOID:0000000009480946

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

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

2. Check 1st trip DTC.

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

EC-288, "Diagnosis Procedure"

.

WITH GST

Follow the procedure “WITH CONSULT” above.

Diagnosis Procedure

INFOID:0000000009480947

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 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 25 and EVAP canister purge volume control solenoid

valve terminal 2. Refer to Wiring Diagram.

BBIA0620E

Voltage: Battery voltage

PBIB2651E

P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID

VALVE

EC-289

< DTC/CIRCUIT DIAGNOSIS >

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

OK (With CONSULT)>>GO TO 4.

OK (Without CONSULT)>>GO TO 5.

NG

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

4.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

With CONSULT

1. Reconnect all harness connectors disconnected.

2. Start engine.

3. Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT. Check that engine speed varies

according to the valve opening.

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 5.

5.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to

EC-289, "Component Inspection"

.

OK or NG

OK

>> GO TO 6.

NG

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

EM-27, "Exploded View"

.

6.

CHECK INTERMITTENT INCIDENT

Refer to

GI-42, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000009480948

EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

With CONSULT

Check air passage continuity of EVAP canister purge volume control

solenoid valve under the following conditions.

Without CONSULT

Check air passage continuity of EVAP canister purge volume control

solenoid valve under the following conditions.

Continuity should exist.

Condition

(PURG VOL CONT/V value)

Air passage continuity

between A and B

100%

Yes

0%

No

PBIB2058E

Condition

Air passage continuity

between A and B

12V direct current supply between
terminals 1 and 2

Yes

No supply

No

PBIB2059E

EC-290

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

P0447 EVAP CANISTER VENT CONTROL VALVE

P0447 EVAP CANISTER VENT CONTROL VALVE

Component Description

INFOID:0000000009480949

The EVAP canister vent control valve (1) is located on the EVAP canister (4) and is used to seal the canister

vent.

• EVAP control system pressure sensor (2)

• Drain filter (3)
•

: Vehicle front

This solenoid valve responds to signals from the ECM. When the

ECM sends an ON signal, the coil in the solenoid valve is energized.

A plunger will then move to seal the canister vent. The ability to seal

the vent is necessary for the on board diagnosis of other evaporative

emission control system components.

This solenoid valve is used only for diagnosis, and usually remains

opened.

When the vent is closed, under normal purge conditions, the evapo-

rative emission control system is depressurized and allows EVAP

Control System diagnoses.

On Board Diagnosis Logic

INFOID:0000000009480950

DTC Confirmation Procedure

INFOID:0000000009480951

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

1. Start engine and wait at least 8 seconds.

2. Check 1st trip DTC.

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

EC-290, "Diagnosis Procedure"

.

WITH GST

Follow the procedure “WITH CONSULT” above.

Diagnosis Procedure

INFOID:0000000009480952

1.

INSPECTION START

Do you have CONSULT?
Yes or No

ALBIA0514ZZ

PBIB1263E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0447
0447

EVAP canister vent control
valve circuit open

An improper voltage signal is sent to ECM
through EVAP canister vent control valve.

• Harness or connectors

(The valve circuit is open or shorted.)

• EVAP canister vent control valve