Infiniti I35 (A33). Manual — part 306
11
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
1. Remove EVAP control system pressure sensor with its harness connector connected.
CAUTION:
Never apply force to the air hole protector of the sensor if equipped.
SEF799W
2. Remove hose from EVAP control system pressure sensor.
3. Turn ignition switch “ON”.
4. Use pump to apply vacuum and pressure to EVAP control system pressure sensor as shown in figure.
CAUTION:
I
Always calibrate the vacuum pump gauge when using it.
I
Do not apply below −20 kPa (−150 mmHg, −5.91 inHg) or over 20 kPa (150 mmHg, 5.91 inHg) of pressure.
5. Check input voltage between ECM terminal 60 and ground.
SEC908C
MTBL1159
CAUTION:
Discard and EVAP control system pressure sensor which has been dropped from a height of more than 0.5 m
(19.7 in) onto a hard surface such as a concrete floor; use a new one.
OK or NG
OK
©
GO TO 12.
NG
©
Replace EVAP control system pressure sensor.
12
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-152.
©
INSPECTION END
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DTC P1446 EVAP CANISTER VENT CONTROL VALVE
Diagnostic Procedure (Cont’d)
EC-565
SEF381Z
SEF267X
Component Description
NHEC1103
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 can-
ister 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 ener-
gized. A plunger will then move to seal the canister vent. The abil-
ity 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
evaporative emission control system is depressurized and allows
“EVAP Control System (Small Leak)” diagnosis.
CONSULT-II Reference Value in Data Monitor
Mode
NHEC1104
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
VENT CONT/V
I
Ignition switch: ON
OFF
On Board Diagnosis Logic
NHEC1106
DTC No.
Trouble diagnosis
name
DTC Detecting Condition
Possible Cause
P1448
1448
EVAP canister vent
control valve open
EVAP canister vent control valve remains opened
under specified driving conditions.
I
EVAP canister vent control valve
I
EVAP control system pressure sensor
and circuit
I
Blocked rubber tube to EVAP canister
vent control valve
I
Water separator
I
EVAP canister is saturated with water.
I
Vacuum cut valve
DTC Confirmation Procedure
NHEC1107
NOTE:
I
If DTC P1448 is displayed with P0442, perform trouble
diagnosis for DTC P1448 first.
I
If
DTC
Confirmation
Procedure
has
been
previously
conducted, always turn ignition switch OFF and wait at least 10
seconds before conducting the next test.
DTC P1448 EVAP CANISTER VENT CONTROL VALVE
Component Description
EC-566
SEC760C
SEC761C
SEC762C
SEC763C
WITH CONSULT-II
NHEC1107S01
TESTING CONDITION:
I
Perform “DTC WORK SUPPORT” when the fuel level is
between 1/4 to 3/4 full and vehicle is placed on flat level
surface.
I
Always perform test at a temperature of 0 to 30°C (32 to
86°F).
I
Open engine hood before conducting the following proce-
dure.
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.
COOLAN TEMP/S
0 - 70°C (32 - 158°F)
INT/A TEMP SE
0 - 30°C (32 - 86°F)
5)
Select “EVP 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 dis-
played on the CONSULT-II screen, go to “Basic Inspection”,
EC-120.
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.
PBIB0153E
11) Make sure the following.
Condition
VENT CONTROL/V
Air passage continuity
between A and B
ON
No
OFF
Yes
If the result is NG, go to “Diagnostic Procedure”, EC-570.
If the result is OK, go to “Diagnostic Procedure” for DTC
P0442, EC-347.
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DTC P1448 EVAP CANISTER VENT CONTROL VALVE
DTC Confirmation Procedure (Cont’d)
EC-567
SEF380Z
Overall Function Check
NHEC1108
Use this procedure to check the overall function of the EVAP can-
ister vent control valve circuit. During this check, a DTC might not
be confirmed.
WITH GST
NHEC1108S01
1)
Disconnect hose from water separator.
2)
Disconnect EVAP canister vent control valve harness connec-
tor.
3)
Verify the following.
Condition
Air passage continuity
12V direct current supply between ter-
minals 1 and 2
No
No supply
Yes
If the result is NG, go to “Diagnostic Procedure”, EC-570.
If the result is OK, go to “Diagnostic Procedure” for DTC
P0442, EC-347.
DTC P1448 EVAP CANISTER VENT CONTROL VALVE
Overall Function Check
EC-568
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