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Nissan Altima L32. Manual - part 296

P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID

VALVE

EC-305

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE

Description

INFOID:0000000004349337

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.

DTC Logic

INFOID:0000000004349338

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CONDITIONING

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.

>> GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

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

2. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Go to

EC-305, "Diagnosis Procedure"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004349339

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.

JMBIA0069ZZ

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0444

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

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-306

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID

VALVE

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.

>> GO TO 2.

DETECT MALFUNCTIONING PART

Check the following.

• Junction block E44, E45

• Harness connectors E11, F2

• 15A fuse (No.42)

• 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 open circuit or short to ground or short to power in harness or connectors.

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-1 >> With CONSULT-III: GO TO 4.

YES-2 >> Without CONSULT-III: GO TO 5.

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

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE OPERATION

With CONSULT-III

1. Reconnect all harness connectors disconnected.

2. Start engine.

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

ies according to the valve opening.

Is the inspection result normal?

YES

>> GO TO 6.

>> GO TO 5.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to

EC-307, "Component Inspection"

Is the inspection result normal?

YES

>> GO TO 6.

>> Replace EVAP canister purge volume control solenoid valve.

CHECK INTERMITTENT INCIDENT

Refer to

GI-42, "Intermittent Incident"

EVAP canister purge volume

control solenoid valve

Ground

Voltage

Connector

Terminal

F29

Ground

Battery voltage

PBIB0080E

EVAP canister purge volume

control solenoid valve

ECM

Continuity

Connector

Terminal

Connector

Terminal

F29

F14

Existed

P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID

VALVE

EC-307

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

>> INSPECTION END

Component Inspection

INFOID:0000000004349340

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.

6. Touch “Qd” and “Qu” on CONSULT-III screen to adjust “PURG

VOL CONT/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

>> Replace EVAP canister purge volume control solenoid valve

Condition

(PURG VOL CONT/V value)

Air passage continuity

between (A) and (B)

100%

Existed

Not existed

JMBIA0068ZZ

Condition

Air passage continuity

between (A) and (B)

12V direct current supply between
terminals 1 and 2

Existed

No supply

Not existed

EC-308

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

P0447 EVAP CANISTER VENT CONTROL VALVE

P0447 EVAP CANISTER VENT CONTROL VALVE

Description

INFOID:0000000004349341

The EVAP canister vent control valve is located on the EVAP canis-

ter and is used to seal the canister vent.

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” diagnosis.

DTC Logic

INFOID:0000000004349342

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

PRECONDITIONING

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.

>> GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Start engine and wait at least 8 seconds.

2. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Go to

EC-308, "Diagnosis Procedure"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004349343

INSPECTION START

Do you have CONSULT-III?
Do you have CONSULT-III?

YES

>> GO TO 2.

>> GO TO 3.

CHECK EVAP CANISTER VENT CONTROL VALVE CIRCUIT

With CONSULT-III

1. Turn ignition switch OFF and then turn ON.

2. Select “VENT CONTROL/V” in “ACTIVE TEST” mode with CONSULT-III.

3. Touch “ON/OFF” on CONSULT-III screen.

4. Check for operating sound of the valve.

PBIB1263E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0447

EVAP canister vent con-
trol 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

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