Infiniti F50. Manual — part 478
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DTC P1448 EVAP CANISTER VENT CONTROL VALVE
EC-553
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EC
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
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
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EC-554
DTC P1448 EVAP CANISTER VENT CONTROL VALVE
11. Make sure the following.
EC-556, "Diagnostic Procedure"
.
If the result is OK, go to “Diagnostic Procedure” for DTC P0442,
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.
EC-556, "Diagnostic Procedure"
.
If the result is OK, go to “Diagnostic Procedure” for DTC P0442,
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
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DTC P1448 EVAP CANISTER VENT CONTROL VALVE
EC-555
C
D
E
F
G
H
I
J
K
L
M
A
EC
Wiring Diagram
EBS00ML6
TBWM0131E
![](/vehicles/zatt/pasieses/thed/inds.png)
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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