Infiniti Q45 (FY33). Manual — part 197
TEC058M
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0446
Evaporative Emission (EVAP) Canister Vent
Control Valve (Circuit) (Cont’d)
EC-317
SEF419U
SEC052C
SEF150S
SEF420U
DIAGNOSTIC PROCEDURE
INSPECTION START
With CONSULT-II
E
Without CONSULT-II
Go to CHECK POWER SUPPLY
.
CHECK CIRCUIT.
1. Perform “VENT CONTROL/V” in
“ACTIVE TEST” mode.
2. Make sure that ratching sound is heard
from the vent control valve.
NG
E
OK
Go to “CHECK COMPO-
NENT” after procedure
.
CHECK POWER SUPPLY.
1. Disconnect EVAP canister vent control
valve harness connector.
2. Turn ignition switch “ON”.
3. Check voltage between terminal
q
2
and
ground with CONSULT-II or tester.
Voltage: Battery voltage
OK
E
NG
Check the following.
I
Harness connectors
C14
,
B64
,
B65
,
B178
I
Harness connectors
B102
,
F64
,
F63
,
M49
I
10A fuse
I
Harness for open or
short between EVAP
canister vent control
valve and fuse
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
20
and terminal
q
1
.
Continuity should exist.
If OK, check harness for short to
ground and short to power.
OK
E
NG
Check the following.
I
Harness connectors
C14
,
B64
,
B65
,
B178
I
Harness connectors
B102
,
F64
I
Harness for open or
short between EVAP
canister vent control
valve and ECM
If NG, repair open circuit or
short to ground or short to
power in harness or con-
nectors.
CHECK COMPONENT
(EVAP canister vent control valve and
O-ring).
Refer to “COMPONENT INSPECTION” on
next page.
OK
E
NG
Replace EVAP canister
vent control valve and
O-ring.
Perform “TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT”, EC-117.
INSPECTION END
TROUBLE DIAGNOSIS FOR DTC P0446
Evaporative Emission (EVAP) Canister Vent
Control Valve (Circuit) (Cont’d)
H
H
H
H
H
H
EC-318
SEC050C
AEC783A
COMPONENT INSPECTION
EVAP canister vent control valve
Check air passage continuity.
Perform “VENT CONTROL/V” in “ACTIVE TEST” mode with
CONSULT-II.
Condition
VENT CONTROL/V
Air passage continuity
between
q
A
and
q
B
ON
No
OFF
Yes
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Condition
Air passage continuity
between
q
A
and
q
B
12V direct current supply between ter-
minals
q
1
and
q
2
No
No supply
Yes
If NG or operation takes more than 1 second, clean valve using air
blower or replace as necessary.
If portion
q
B
is rusted, replace EVAP canister vent control
valve.
Make sure new O-ring is installed properly.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0446
Evaporative Emission (EVAP) Canister Vent
Control Valve (Circuit) (Cont’d)
EC-319
SEF429Q
Evaporative Emission (EVAP) Control System
Pressure Sensor
COMPONENT DESCRIPTION
The EVAP control system pressure sensor detects pressure in the
purge line. The sensor output voltage to the ECM increases as
pressure increases. The EVAP control system pressure sensor is
not used to control the engine system. It is used only for on board
diagnosis.
SEF954S
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
EVAP SYS PRES
I
Ignition switch: ON
Approx. 3.4V
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)
98
BR/W
Sensors’ power supply
Ignition switch “ON”
Approximately 5V
92
W/R
EVAP control system
pressure sensor
Ignition switch “ON”
Approximately 3.4V
ON BOARD DIAGNOSIS LOGIC
Diagnostic Trouble
Code No.
Malfunction is detected when .
Check Items
(Possible Cause)
P0450
0704
I
An improper voltage signal from EVAP control sys-
tem pressure sensor is sent to ECM.
I
Harness or connectors
(The EVAP control system pressure sensor circuit
is open or shorted.)
I
Rubber hose to EVAP control system pressure
sensor is clogged, bent, kinked, disconnected or
not corrected properly.
I
EVAP control system pressure sensor
I
EVAP canister vent control valve (The valve is
stuck open.)
I
EVAP canister purge volume control valve
I
EVAP canister
I
Rubber hose from EVAP canister vent control
valve to water separator
TROUBLE DIAGNOSIS FOR DTC P0450
EC-320
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст