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1-12 GENERAL INFORMATION
Technical Information – Air Inlet System
Operation
The subthrottle control system consists of the subthrottle valve, subthrottle valve actuator with a
steppi
ng motor built in it, ECU, and subthrottle sensor. The subthrottle valve is built in the each throttle
body.
The subthrottle control system operates on the signal supplied from t he ECU. The open/close oper-
ation o
f the subthrottle valve is performed by the subthrottle actuator which is controlled by the ECU
to change the current direction into the motor of the subthrottle valve actuator.
The s ubthrottle sensor detects the subthrottle valve actuator movement by measuring voltage and
the EC
U determines the subthrottle valve angle based on the operation map.
When turning the ignition switch ON, every time the EC U automatically drives the subthrottle valve
from fully closed position to fully opened position. The ECU memorizes these positions and turns
back t
he subthrottle valve to the original point to confirm the subthrottle valve idling voltage.
A. Su
bthrottle Valves
B. S ubthrottle Valve Actuator
C. S ubthrottle S ensor
D
.
M
ain Throttle Sensor
E. EC
U (Electric Control Unit)
F. Air Cleaner Side
G. Crankshaft Sensor
H
.
S
peed Sensor