Infiniti QX4 (R50). Manual — part 276
16
CHECK THROTTLE POSITION SWITCH
1. Install all removed parts.
2. Start engine and warm it up to normal operating temperature.
3. Turn ignition switch “OFF”.
4. Remove vacuum hose connected to throttle opener.
5. Connect suitable vacuum hose to vacuum pump and the throttle opener.
6. Apply vacuum [more than −40.0 kPa (−300 mmHg, −11.81 inHg)] until the throttle drum becomes free from the rod of
the throttle opener.
SEF793W
7. Disconnect closed throttle position switch harness connector.
8. Check continuity between closed throttle position switch terminals 6 and 5 under the following conditions.
Resistance measurement must be made with throttle position switch installed in vehicle.
SEF998Y
OK or NG
OK
©
GO TO 18.
NG
©
GO TO 17.
17
ADJUST THROTTLE POSITION SWITCH
Check the following items. Refer to “Basic Inspection”, EC-101.
MTBL0470
Is it possible to adjust closed throttle position switch?
Yes or No
Yes
©
GO TO 18.
No
©
Replace throttle position switch.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1447 EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM PURGE
FLOW MONITORING
Diagnostic Procedure (Cont’d)
EC-571
18
CHECK EVAP PURGE LINE
Inspect EVAP purge line (pipe and rubber tube). Check for evidence of leaks.
Refer to “EVAPORATIVE EMISSION LINE DRAWING”, EC-36.
OK or NG
OK
©
GO TO 19.
NG
©
Replace it.
19
CLEAN EVAP PURGE LINE
Clean EVAP purge line (pipe and rubber tube) using air blower.
©
GO TO 20.
20
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-140.
©
INSPECTION END
DTC P1447 EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM PURGE
FLOW MONITORING
Diagnostic Procedure (Cont’d)
EC-572
SEF032W
SEF143S
Component Description
NBEC0338
NOTE:
If DTC P1448 is displayed with P0440, 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
NBEC0339
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
VENT CONT/V
I
Ignition switch: ON
OFF
ECM Terminals and Reference Value
NBEC0680
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.
TERMI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
40
G/Y
EVAP canister vent
control valve
[Ignition switch “ON”]
BATTERY VOLTAGE
(11 - 14V)
On Board Diagnosis Logic
NBEC0341
Malfunction is detected when EVAP canister vent control valve
remains opened under specified driving conditions.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1448 EVAPORATIVE EMISSION (EVAP) CANISTER VENT CONTROL
VALVE (OPEN)
Component Description
EC-573
Possible Cause
NBEC0591
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
NBEC0342
NOTE:
I
If DTC P1448 is displayed with P0440 or P1440, 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.
SEF565X
SEF566X
SEF567X
WITH CONSULT-II
NBEC0342S01
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
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 “EVAP SML LEAK P0440/P1440” 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 “Basic Inspection”,
EC-101.
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.
DTC P1448 EVAPORATIVE EMISSION (EVAP) CANISTER VENT CONTROL
VALVE (OPEN)
Possible Cause
EC-574
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст