Infiniti Q45. Manual - part 448

 

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Infiniti Q45. Manual - part 448

 

 

DTC P0448 EVAP CANISTER VENT CONTROL VALVE

EC-431

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DTC Confirmation Procedure

NBS0022Z

CAUTION:

Always drive vehicle at a safe speed.
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.

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Start engine.

4.

Drive vehicle at a speed of approximately 80 km/h (50 MPH) for
a maximum of 15 minutes.

NOTE:
If a malfunction exists, NG result may be displayed quicker.

5.

If 1st trip DTC is detected, go to 

EC-433, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure WITH CONSULT-II above.

PBIB1917E

EC-432

DTC P0448 EVAP CANISTER VENT CONTROL VALVE

Wiring Diagram

NBS00230

TBWM1233E

DTC P0448 EVAP CANISTER VENT CONTROL VALVE

EC-433

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EC

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

NBS00231

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.

2. 

CHECK WATER SEPARATOR

Refer to 

EC-403, "Component Inspection"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Clean or replace water separator.

3. 

CHECK EVAP CANISTER VENT CONTROL VALVE

Refer to 

EC-435, "Component Inspection"

 .

OK or NG

OK

>> GO TO 4.

NG

>> Replace EVAP canister vent control valve.

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]

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)

PBIB0026E

EC-434

DTC P0448 EVAP CANISTER VENT CONTROL VALVE

4. 

CHECK IF EVAP CANISTER SATURATED WITH WATER

1.

Remove EVAP canister with EVAP canister vent control valve attached.

2.

Does water drain from the EVAP canister.

Yes or No

Yes

>> GO TO 5.

No

>> GO TO 7.

5. 

CHECK EVAP CANISTER

Weigh the EVAP canister with the EVAP canister vent control valve attached.
The weight should be less than 1.8 kg (4.0 lb).

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

6. 

DETECT MALFUNCTIONING PART

Check the following.

EVAP canister for damage

EVAP hose between EVAP canister and water separator for clogging or poor connection

>> Repair hose or replace EVAP canister.

7. 

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR

1.

Disconnect EVAP control system pressure sensor harness connector.

2.

Check connectors for water.

OK or NG

OK

>> GO TO 8.

NG

>> Replace EVAP control system pressure sensor.

8. 

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR

Refer to 

EC-450, "Component Inspection"

 .

OK or NG

OK

>> GO TO 9.

NG

>> Replace EVAP control system pressure sensor.

9. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

SEF596U

Water should not exist.

 

 

 

 

 

 

 

Content   ..  446  447  448  449   ..