User's Manual

GENERAL INFORMATION 1-11
Technical Information – A ir Inlet System
Operation
The subthrottle control system consists of the subthrottle valve, subthrottle valve actuator with a
stepping 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 the ECU. The open/close oper-
ation of 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 m easuring voltage and
the EC U determines the subthrottle valve angle based on the operation m ap.
When turning the ignition switch O N, every time the ECU automatically drives the subthrottle valve
from fully closed position to fully opened position. The ECU memorizes these positions and turns
back the subthrottle valve to the original point to confirm the subthrottle valve idling voltage.
A. Subthrottle Valves
B. Subthrottle Valve Actuator
C. Subthrottle Sensor
D. Main Throttle Sensor
E. ECU (Electric Control Unit)
F. Air Cleaner Side
G. Crankshaft Sensor
H. Speed Sensor