Infiniti Q45. Manual - part 446

DTC P0447 EVAP CANISTER VENT CONTROL VALVE

EC-423

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Wiring Diagram

NBS001XE

TBWM1233E

EC-424

DTC P0447 EVAP CANISTER VENT CONTROL VALVE

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

Diagnostic Procedure

NBS001XF

PROCEDURE FOR MALFUNCTION A

1. 

INSPECTION START

Do you have CONSULT-II?

Yes or No

Yes

>> GO TO 2.

No

>> GO TO 3.

2. 

CHECK EVAP CANISTER VENT CONTROL VALVE CIRCUIT

 With CONSULT-II

1.

Turn ignition switch OFF and then turn ON

2.

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

3.

Touch “ON/OFF” on CONSULT-II screen.

4.

Check for operating sound of the valve.
Clicking noise should be heard.

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 3.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

111

W/B

ECM relay
(Self shut-off)

[Engine is running]
[Ignition switch: OFF]

●

For a few seconds after turning ignition 
switch OFF

0 - 1.5V

[Ignition switch: OFF]

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More than a few seconds after turning igni-
tion switch OFF

BATTERY VOLTAGE
(11 - 14V)

117

L/Y

EVAP canister vent control 
valve

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

119

120

R
R

Power supply for ECM

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

PBIB1679E

DTC P0447 EVAP CANISTER VENT CONTROL VALVE

EC-425

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3. 

CHECK EVAP CANISTER VENT CONTROL VALVE POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect EVAP canister vent control valve harness connector.

3.

Turn ignition switch ON.

4.

Check voltage between EVAP canister vent control valve termi-
nal 1 and ground with CONSULT-II or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors M135, F105

●

Harness connectors M139, B209

●

Harness connectors B251, B401

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Harness for open or short between EVAP canister vent control valve and ECM relay

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

5. 

CHECK EVAP CANISTER VENT CONTROL 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 117 and EVAP canister vent control valve terminal 2.
Refer to Wiring Diagram.

4.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

Voltage: Battery voltage

PBIB0026E

PBIB0152E

Continuity should exist.

EC-426

DTC P0447 EVAP CANISTER VENT CONTROL VALVE

6. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors F105, M135

●

Harness connectors M141, B211

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Harness connectors B251, B401

●

Harness for open or short between EVAP canister vent control valve and ECM

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

7. 

CHECK RUBBER TUBE FOR CLOGGING

1.

Disconnect rubber tube connected to EVAP canister vent control valve.

2.

Check the rubber tube for clogging.

OK or NG

OK

>> GO TO 8.

NG

>> Clean the rubber tube using an air blower.

8. 

CHECK EVAP CANISTER VENT CONTROL VALVE

Refer to 

EC-428, "Component Inspection"

 .

OK or NG

OK

>> GO TO 9.

NG

>> Replace EVAP canister vent control valve.

9. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

PROCEDURE FOR MALFUNCTION B

1. 

CHECK RUBBER TUBE

1.

Turn ignition switch OFF.

2.

Disconnect rubber tube connected to EVAP canister vent control valve.

3.

Check the rubber tube for clogging.

OK or NG

OK

>> GO TO 2.

NG

>> Clean rubber tube using an air blower.

PBIB0026E