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Nissan Altima L32. Manual - part 550

P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID

VALVE

EC-1321

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID
VALVE

Description

INFOID:0000000004362161

The EVAP canister purge volume control solenoid valve is used to

control the flow rate of fuel vapor from the EVAP canister. 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 via the valve.

DTC Logic

INFOID:0000000004362162

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CONDITIONING

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

ing the next test.

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:

Before performing the following procedure, confirm battery voltage is more than 11 V 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-1321, "Diagnosis Procedure"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004362163

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.

PBIB3489E

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 via 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 via the valve

• Harness or connectors

(The solenoid valve circuit is shorted.)

• EVAP canister purge volume control so-

lenoid valve

EC-1322

< COMPONENT DIAGNOSIS >

[VQ35DE]

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.

• Harness connectors E11, F2

• 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, 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, 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 C/V” in “ACTIVE TEST” mode with CONSULT-III. Check that engine speed varies

according to the valve opening.

Does engine speed vary according to the valve opening?

YES

>> GO TO 6.

>> GO TO 5.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to

EC-1323, "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 con-

trol solenoid valve

ECM

Continuity

Connector

Terminal

Connector

Terminal

F29

F14

Existed

P0444, P0445 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID

VALVE

EC-1323

< COMPONENT DIAGNOSIS >

[VQ35DE]

>> INSPECTION END

Component Inspection

INFOID:0000000004362164

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 C/V” in “ACTIVE TEST” mode with CONSULT-III.

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

VOL C/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 C/V value)

Air passage continuity

between (A) and (B)

100%

Existed

Not existed

PBIB2058E

Condition

Air passage continuity

between (A) and (B)

12 V direct current supply between
terminals 1 and 2

Existed

No supply

Not existed

PBIB2059E

EC-1324

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0447 EVAP CANISTER VENT CONTROL VALVE

P0447 EVAP CANISTER VENT CONTROL VALVE

Description

INFOID:0000000004362165

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:0000000004362166

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

PRECONDITIONING

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

ing the next test.

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:

Before performing the following procedure, confirm battery voltage is more than 11 V 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-1324, "Diagnosis Procedure"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004362167

INSPECTION START

Will CONSULT-III be used?
Will CONSULT-III be used?

YES

>> GO TO 2.

>> GO TO 3.

CHECK EVAP CANISTER VENT CONTROL VALVE CIRCUIT

With CONSULT-III

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 via
the EVAP canister vent control valve.

• Harness or connectors

(The valve circuit is open or shorted.)

• EVAP canister vent control valve
• Hoses

(Hoses are connected incorrectly or
clogged.)

Content .. 548 549 550 551 ..