Infiniti F50. Manual - part 478

 

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Infiniti F50. Manual - part 478

 

 

DTC P1448 EVAP CANISTER VENT CONTROL VALVE

EC-553

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DTC Confirmation Procedure

EBS00ML4

NOTE:

If DTC P1448 is displayed with P0442, P0455, P0456, P1442 or P1456, first perform trouble diagno-
sis for DTC P1448.

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

TESTING CONDITION:

Perform “DTC WORK SUPPORT” when the fuel level is between 1/4 and 3/4 full and vehicle is
placed on flat level surface.

Always perform test at a temperature of 0 to 30

°

C (32 to 86

°

F).

1.

Turn ignition switch “ON”.

2.

Turn ignition switch “OFF” and wait at least 10 seconds.

3.

Turn ignition switch “ON” and select “DATA MONITOR” mode with CONSULT-II.

4.

Make sure that the following conditions are met.

5.

Select “EVAP SML LEAK P0442/P1442” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” mode
with CONSULT-II.
Follow the instruction displayed.

If the engine speed cannot be maintained within the range displayed on the CONSULT-II screen, go to

EC-82, "Basic Inspection"

 .

6.

Make sure that “OK” is displayed.
If “NG” is displayed, go to the following step.

NOTE:
Make sure that EVAP hoses are connected to EVAP canister
purge volume control solenoid valve properly.

7.

Stop engine and wait at least 10 seconds, then turn “ON”.

8.

Disconnect hose from water separator.

9.

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

10. Touch “ON” and “OFF” alternately.

COOLAN TEMP/S

0 - 70

°

C (32 - 158

°

F)

INT/A TEMP SE

0 - 30

°

C (32 - 86

°

F)

SEF475Y

PBIB0829E

SEC763C

EC-554

DTC P1448 EVAP CANISTER VENT CONTROL VALVE

11. Make sure the following.

If the result is NG, go to 

EC-556, "Diagnostic Procedure"

 .

If the result is OK, go to “Diagnostic Procedure” for DTC P0442,

EC-332

 .

Overall Function Check

EBS00ML5

Use this procedure to check the overall function of the EVAP canister vent control valve circuit. During this
check, a DTC might not be confirmed.

 WITH GST

1.

Disconnect hose from water separator.

2.

Disconnect EVAP canister vent control valve harness connector.

3.

Verify the following.

If the result is NG, go to 

EC-556, "Diagnostic Procedure"

 .

If the result is OK, go to “Diagnostic Procedure” for DTC P0442,

EC-332

 .

Condition

VENT CONTROL/V

Air passage continuity between A  and 

B

ON

No

OFF

Yes

PBIB0153E

Condition

Air passage continuity

12V direct current supply between ter-
minals 1 and 2

No

No supply

Yes

AEC783A

DTC P1448 EVAP CANISTER VENT CONTROL VALVE

EC-555

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Wiring Diagram

EBS00ML6

TBWM0131E

EC-556

DTC P1448 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

EBS00ML7

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 EVAP CANISTER VENT CONTROL VALVE

Refer to 

EC-558, "Component Inspection"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Replace EVAP canister vent control valve.

3. 

CHECK VACUUM CUT VALVE

Refer to 

EC-590, "Component Inspection"

 .

OK or NG

OK

>> GO TO 4.

NG

>> Replace vacuum cut valve.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

158

L/Y

EVAP canister vent 
control valve

[Ignition switch “ON”]

BATTERY VOLTAGE
(11 - 14V)

PBIB0026E

 

 

 

 

 

 

 

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