Infiniti Q45 (FY33). Manual — part 239
SEF012V
SEF880T
SEF605U
DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK POWER SUPPLY.
1. Disconnect EVAP canister purge control
solenoid 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 connector
M49
,
F63
I
10A fuse
I
Harness for open or short
between EVAP canister
purge control solenoid
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
22
and terminal
q
1
.
Continuity should exist.
If OK, check harness for short to ground
and short to power.
OK
E
NG
Repair harness or connec-
tors.
CHECK COMPONENT
(EVAP canister purge control solenoid
valve).
Refer to “COMPONENT INSPECTION”
below.
OK
E
NG
Replace EVAP canister
purge control solenoid
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 P1492
Evaporative Emission (EVAP) Canister Purge
Control Valve/Solenoid Valve (Circuit) (Cont’d)
H
H
H
H
H
EC-485
SEF765X
SEF400W
SEF313Q
COMPONENT INSPECTION
EVAP canister purge control solenoid valve
1. Turn ignition switch “ON”.
2. Select “PURG CONT S/V” of “ACTIVE TEST” mode
with CONSULT-II.
3. Start engine and warm it up to normal operating tem-
perature.
4. Disconnect vacuum hose at EVAP canister purge con-
trol valve.
5. Touch “ON” and “OFF” and check for vacuum passing
through the hose.
Condition
Vacuum
Idle
Not exist
2,000 rpm
Exist
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Check air passage continuity.
Condition
Air passage
continuity
between
q
A
and
q
B
Air passage
continuity
between
q
A
and
q
C
12V direct current supply
between terminals
Yes
No
No supply
No
Yes
If NG or operation takes more than 1 second, replace solenoid
valve.
TROUBLE DIAGNOSIS FOR DTC P1492
Evaporative Emission (EVAP) Canister Purge
Control Valve/Solenoid Valve (Circuit) (Cont’d)
EC-486
Evaporative Emission (EVAP) Canister Purge
Control Valve/Solenoid Valve
SYSTEM DESCRIPTION
Crankshaft position sensor (POS)
E
Engine speed
ECM
E
Engine coolant temperature sensor
E
Engine coolant temperature
EVAP canister
purge control sole-
noid valve
Vacuum
signal
Closed throttle position switch
E
Closed throttle position
Vehicle speed sensor
E
Vehicle speed
Ignition switch
E
Start signal
EVAP canister
purge control valve
This system controls the vacuum signal applied to
the EVAP canister purge control valve.
When the ECM detects any of the following
conditions, current does not flow through the EVAP
canister purge control solenoid valve.
The solenoid valve cuts the vacuum signal so that
the EVAP canister purge control valve remains
closed.
I
Start switch “ON”
I
Closed throttle position
I
Low or high engine coolant temperature
I
During deceleration
I
Engine stopped
I
For 60 seconds after starting engine
(After warming up to normal operating tempera-
ture)
SEF383RE
COMPONENT DESCRIPTION
EVAP canister purge control solenoid valve
The EVAP canister purge control solenoid valve responds to sig-
nals from the ECM. When the ECM sends an OFF signal, the
vacuum signal (from the intake manifold to the EVAP canister
purge control valve) is cut.
When the ECM sends an ON (ground) signal, the vacuum signal
passes through the EVAP canister purge control solenoid valve.
The signal then reaches the EVAP canister purge control valve.
SEF343QB
EVAP canister purge control valve
When the vacuum signal is cut by EVAP canister purge control
solenoid valve, EVAP canister purge control valve shuts off the
EVAP purge line.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P1493
H
EC-487
EVAPORATIVE EMISSION SYSTEM DIAGRAM
SEF850U
CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
PURG CONT S/V
I
Engine: After warming up
Idle
OFF
2,000 rpm
ON
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)
22
Y
EVAP canister purge con-
trol solenoid valve
Engine is running.
Idle speed
BATTERY VOLTAGE
(11 - 14V)
Engine is running.
Engine speed is 2,000 rpm.
Approximately 0V
ON BOARD DIAGNOSIS LOGIC
Diagnostic
Trouble Code
No.
Malfunction is detected when .
Check Items
(Possible Cause)
P1493
0312
I
EVAP canister purge control valve does not operate
properly (stuck open).
I
EVAP canister purge control valve
I
EVAP canister purge control solenoid valve
I
Vacuum hoses for clogging or disconnection
I
EVAP control system pressure sensor
I
EVAP canister vent control valve
I
Water separator
I
EVAP canister saturated with water
TROUBLE DIAGNOSIS FOR DTC P1493
Evaporative Emission (EVAP) Canister Purge
Control Valve/Solenoid Valve (Cont’d)
EC-488
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