Nissan Frontier D22. Manual — part 639
DTC P1448 EVAP CANISTER VENT CONTROL VALVE
EC-1659
[VG33ER]
C
D
E
F
G
H
I
J
K
L
M
A
EC
DTC P1448 EVAP CANISTER VENT CONTROL VALVE
PFP:14935
Component Description
UBS00E1C
NOTE:
If DTC P1448 is displayed with P0442, perform trouble diagno-
sis for DTC P1448 first.
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 (Small Leak)” diagnosis.
CONSULT-II Reference Value in Data Monitor Mode
UBS00E1D
Specification data are reference values.
On Board Diagnosis Logic
UBS00E1E
DTC Confirmation Procedure
UBS00E1F
NOTE:
●
If DTC P1448 is displayed with P0442, perform trouble diagnosis for DTC P1448 first.
●
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait
at least 5 seconds before conducting the next test.
WITH CONSULT-II
TESTING CONDITION:
●
Perform “DTC WORK SUPPORT” when the fuel level is less than 3/4 full and vehicle is placed on
flat level surface.
SEF032W
SEF143S
MONITOR ITEM
CONDITION
SPECIFICATION
VENT CONT/V
●
Ignition switch: ON
OFF
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1448
EVAP canister vent control
valve open
EVAP canister vent control valve remains
open under specified driving conditions.
●
EVAP canister vent control valve
●
EVAP control system pressure sensor
and the circuit
●
Blocked rubber tube to EVAP canister
vent control valve
●
Water separator
●
EVAP canister is saturated with water
●
Vacuum cut valve
EC-1660
[VG33ER]
DTC P1448 EVAP CANISTER VENT CONTROL VALVE
●
Always perform test at a temperature of 0 to 30
°C (32 to 86°F).
●
It is better that the fuel level is low.
1.
Turn ignition switch ON.
2.
Turn ignition switch OFF and wait at least 5 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.
NOTE:
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 5 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.
11. Make sure the following.
If the result is NG, go to
EC-1663, "Diagnostic Procedure"
.
If the result is OK, go to
EC-1502, "Diagnostic Procedure"
COOLAN TEMP/S
0 - 32
°C (32 - 90°F)
INT/A TEMP SE
More than 0
°C (32°F)
SEF475Y
Condition
VENT CONTROL/V
Air passage continuity between A and
B
ON
No
OFF
Yes
PBIB1461E
SEF013Z
DTC P1448 EVAP CANISTER VENT CONTROL VALVE
EC-1661
[VG33ER]
C
D
E
F
G
H
I
J
K
L
M
A
EC
Overall Function Check
UBS00E1G
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-1663, "Diagnostic Procedure"
If the result is OK, go to
EC-1502, "Diagnostic Procedure"
.
Condition
Air passage continuity
12V direct current supply between ter-
minals 1 and 2
No
No supply
Yes
BBIA0309E
EC-1662
[VG33ER]
DTC P1448 EVAP CANISTER VENT CONTROL VALVE
Wiring Diagram
UBS00E1H
BBWA1086E
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст