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Description
NHEC0523
If DTC P1130 is displayed with P1165, first perform trouble diag-
nosis for DTC P1165, EC-478.
SYSTEM DESCRIPTION
NHEC0523S01
Sensor Input Signal to ECM
ECM func-
tion
Actuator
Throttle position sensor Throttle position
Swirl control
valve con-
trol
Swirl control valve control sole-
noid valve
" Vacuum signal
Swirl control valve actuator
"
Swirl control valve
Ignition switch Start signal
Crankshaft position sensor (POS) Engine speed (POS signal)
Crankshaft position sensor (REF) Engine speed (REF signal)
Mass air flow sensor Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
This system has a swirl control valve in the intake passage of each
cylinder.
While idling and during low engine speed operation, the swirl con-
trol valve closes. Thus the velocity of the air in the intake passage
increases, promoting the vaporization of the fuel and producing a
swirl in the combustion chamber.
Because of this operation, this system tends to increase the burn-
ing speed of the gas mixture, improve fuel consumption, and
increase the stability in running conditions.
Also, except when idling and during low engine speed operation,
this system opens the swirl control valve. In this condition, this
system tends to increase power by improving intake efficiency via
reduction of intake flow resistance, intake flow.
The solenoid valve controls swirl control valve’s shut/open condi-
tion. This solenoid valve is operated by the ECM.
Throttle position
sensor (Idle posi-
tion)
Engine speed
Swirl control valve
control solenoid
valve
Swirl control valve
ON Below 3,200 rpm ON Closed
OFF
Less than 3,200
rpm
ON Closed
More than 3,600
rpm
OFF Open
When engine coolant temperature is below 10°C (50°F) and above 55°C (131°F),
swirl control valve is kept open regardless of above condition.
SEF372X
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1130 SWIRL CONTROL VALVE CONTROL SOLENOID VALVE
Description
EC-453
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