Infiniti Q45 (FY33). Manual — part 196
SEF417U
SEF578Q
SEF418U
DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK POWER SUPPLY.
1. Turn ignition switch “OFF”.
2. Disconnect EVAP canister purge vol-
ume control valve harness connector.
3. Turn ignition switch “ON”.
4. Check voltage between terminals
q
2
,
q
5
and engine ground with CONSULT-II
or tester.
Voltage: Battery voltage
OK
E
NG
Check the following.
I
Harness for open or
short between EVAP
canister purge volume
control valve and ECM
relay
I
Harness for open or
short between EVAP
canister purge volume
control valve and ECM
If NG, repair harness or
connectors.
CHECK OUTPUT SIGNAL CIRCUIT.
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between
ECM terminal
q
28
and terminal
q
1
,
ECM terminal
q
29
and terminal
q
4
,
ECM terminal
q
35
and terminal
q
3
,
ECM terminal
q
36
and terminal
q
6
.
Continuity should exist.
If OK, check harness for short to
ground and short to power.
OK
E
NG
Replace harness or con-
nectors.
CHECK COMPONENT
(EVAP canister purge volume control
valve).
Refer to “COMPONENT INSPECTION” on
next page.
OK
E
NG
Replace EVAP canister
purge volume control
valve.
Perform “TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT”, EC-117.
INSPECTION END
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0443
Evaporative Emission (EVAP) Canister Purge
Volume Control Valve (Circuit) (Cont’d)
H
H
H
H
H
EC-313
SEF353Q
SEC049C
SEF763P
SEF417U
COMPONENT INSPECTION
EVAP canister purge volume control valve
1. Disconnect EVAP canister purge volume control valve
harness connector.
2. Check resistance between the following terminals.
terminal
q
2
and terminals
q
1
,
q
3
terminal
q
5
and terminals
q
4
,
q
6
Resistance:
Approximately 35 - 43
Ω
[At 25°C (77°F)]
3. Reconnect EVAP canister purge volume control valve
harness connector.
4. Remove EVAP canister purge volume control valve
from intake manifold collector and disconnect hoses
from the valve.
(Plug the purge hoses. The EVAP canister purge vol-
ume control valve harness connector should remain
connected.)
5. Turn ignition switch “ON”.
6. Perform “PURG VOL CONT/V” in “ACTIVE TEST”
mode with CONSULT-II. Check that EVAP canister
purge volume control valve shaft moves smoothly for-
ward and backward according to the valve opening.
If NG, replace the EVAP canister purge volume control
valve.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1. Disconnect EVAP canister purge volume control valve
harness connector.
2. Check resistance between the following terminals.
terminal
q
2
and terminals
q
1
,
q
3
terminal
q
5
and terminals
q
4
,
q
6
Resistance:
Approximately 35 - 43
Ω
[At 25°C (77°F)]
3. Reconnect EVAP canister purge volume control valve
harness connector.
4. Remove EVAP canister purge volume control valve
from intake manifold collector and disconnect hoses
from the valve.
(Plug the purge hoses. The EVAP canister purge vol-
ume control valve harness connector should remain
connected.)
5. Turn ignition switch “ON” and “OFF”. Check that EVAP
canister purge volume control valve shaft moves
smoothly forward and backward according to the igni-
tion switch position.
If NG, replace the EVAP canister purge volume control
valve.
TROUBLE DIAGNOSIS FOR DTC P0443
Evaporative Emission (EVAP) Canister Purge
Volume Control Valve (Circuit) (Cont’d)
EC-314
SEF032W
SEF419U
Evaporative Emission (EVAP) Canister Vent
Control Valve (Circuit)
COMPONENT DESCRIPTION
The EVAP canister vent control valve is located on the EVAP can-
ister and is used to seal the canister vent.
This solenoid (the EVAP canister vent control 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 evapora-
tive 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
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
VENT CONT/V
I
Ignition switch: ON
OFF
ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring voltage. Doing so may result in damage to the
ECM’s transistor. Use a ground other than ECM terminals such as the body ground.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA
(DC Voltage)
20
P/B
EVAP canister vent con-
trol valve
Ignition switch “ON”
BATTERY VOLTAGE
(11 - 14V)
ON BOARD DIAGNOSIS LOGIC
Diagnostic
Trouble Code
No.
Malfunction is detected when .
Check Items
(Possible Cause)
P0446
0903
I
An improper voltage signal is sent to ECM through
EVAP canister vent control valve.
I
Harness or connectors
(EVAP canister vent control valve circuit is open or
shorted.)
I
EVAP canister vent control valve
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0446
EC-315
SEF392X
DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has just been completed, always turn ignition switch
“OFF” and wait at least 5 seconds before conducting the next
test.
TESTING CONDITION:
Before performing the following procedure, confirm battery
voltage is more than 11V at idle.
1) Turn ignition switch “ON”.
2) Select “DATA MONITOR” mode with CONSULT-II.
3) Start engine and wait at least 8 seconds.
4) If 1st trip DTC is detected, go to “DIAGNOSTIC
PROCEDURE”, EC-318.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Follow the procedure “With CONSULT-II” above.
TROUBLE DIAGNOSIS FOR DTC P0446
Evaporative Emission (EVAP) Canister Vent
Control Valve (Circuit) (Cont’d)
EC-316
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст