Hyundai Sonata 1991 Shop Manual page 169

AUTOMATIC SPEED CONTROL (CRUISE)
NOTE
The ECU has a built-in current detection circuit to prevent the
actuator motor from becoming overloaded when the throttle
valve is fully opened.
The figure at the left shows control signals applied to the actua-
tor motor under operation. The extension or retraction of the
actuator rack gear is dependent of the direction of current flow
to the actuator motor windings.
ACTUATOR
MOTOR
ELECTRONIC CONTROL UNIT (ECU)
The ECU incorporates circuity which provides the set, coast,
resume, acceleration, cancel, low-speed limitation, overdrive OFF
control and automatic cancellation functions. The ECU inputs sig-
nals from the vehicle-speed sensor and the switches, and outputs
control signals to the actuator's D.C. motor, the electromagnetic
clutch, the automatic transaxle (ELC 4 AfT) control unit, and
the alarm.
27-50
Throttle (close direction)
Throttle (open direction)
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