Infiniti Q45 (FY33). Manual — part 238
Evaporative Emission (EVAP) Canister Purge
Control Valve/Solenoid Valve (Circuit)
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 P1492
H
EC-481
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)
P1492
0807
I
The improper voltage signal is sent to ECM through
EVAP canister purge control solenoid valve.
I
Harness or connectors
(The EVAP canister purge control solenoid valve cir-
cuit is open or shorted.)
I
EVAP canister purge control solenoid valve
TROUBLE DIAGNOSIS FOR DTC P1492
Evaporative Emission (EVAP) Canister Purge
Control Valve/Solenoid Valve (Circuit) (Cont’d)
EC-482
SEF392X
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn the igni-
tion switch “OFF” and wait at least 5 seconds before conduct-
ing the next test.
DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE
1) Turn ignition switch “ON”.
2) Select “DATA MONITOR” mode with CONSULT-II.
3) Wait at least 5 seconds.
4) If 1st trip DTC is detected, go to “DIAGNOSTIC
PROCEDURE”, EC-485.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Follow the procedure “With CONSULT-II” above.
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)
EC-483
TEC071M
TROUBLE DIAGNOSIS FOR DTC P1492
Evaporative Emission (EVAP) Canister Purge
Control Valve/Solenoid Valve (Circuit) (Cont’d)
EC-484
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