Subaru 2002 Impreza Service Manual page 473

CRUISE CONTROL
Cruise Control Svstem
C: CONTROL AND OPERATION
Constant speed
control
Speed setting
control
Deceleration
control
Acceleration
control
Resume control
Manual cancel
control
Low speed limit
control
Motor control
When actual vehicle speed is higher than the "set" speed, the motor in the actuator operates to move the
throttle valve in the closing direction by the amount corresponding to the difference between the two speeds.
When actual driving speed is lower than "set" speed, the motor operates to move the throttle valve in the
opening enabling direction according to the difference in speed.
When SETKOAST switch is pressed with main switch ON while the vehicle is being driven at a speed great-
er than 40 km/h (25 MPH), current flows to the actuator. This causes the clutch in the actuator to engage,
enabling the motor to operate. The motor moves the throttle valve to the position corresponding to the accel-
erator pedal position. The vehicle is driven at the set speed.
When SETKOAST switch is turned ON while the vehicle is cruising at a constant speed, the motor in the
actuator rotates to move the throttle valve in the closing direction. This causes the vehicle to coast. When the
switch is turned OFF, the vehicle speed is stored in memory and the vehicle maintains that speed thereafter.
When RESUME/ACCEL switch is turned ON while the vehicle is cruising at a constant speed, the motor in
the actuator rotates to move the throttle valve in the opening direction. This causes the vehicle to accelerate
by a certain amount. When the switch is turned OFF, the vehicle speed is stored in memory and the vehicle
maintains that speed thereafter.
When RESUME/ACCEL switch is turned ON after the cruise control is temporarily cancelled, vehicle speed
returns to that speed which was stored in memory just before the cruise control is cancelled. This occurs only
when the vehicle is running at a speed greater than 32 km/h (20 MPH).
In the following cases, however, the set vehicle speed is completely cleared. Therefore, no resume control is
performed.
(1 ) Ignition switch is turned OFF
(2) Main switch is turned OFF
When any of the following signals is entered into the cruise control module, the clutch is disengaged and the
cruise control is deactivated.
(1) Stop light switch ON signal (Brake pedal depressed) (2) Brake switch OFF signal (Brake pedal de-
pressed) (3) Clutch switch OFF signal (Clutch pedal depressed
-
MT) (4) Inhibitor switch ON signal (Selector
lever set to "N"
-
AT) (5) CANCEL switch ON signal (Command switch cruise control lever pulled) (6) Ignition
switch OFF signal (7) Main switch OFF signal
When the vehicle speed drops below 32 km/h (20 MPH), the cruise control is automatically cancelled. Cruise
control at any speed lower than 40 km/h (25 MPH) cannot be effected.
When the vehicle speed becomes 10 km/h (6 MPH) or more higher than the memorized speed while vehicle
is running utilizing the cruise control (in a downgrade, for example), the actuator's clutch is turned OFF so
that the vehicle decelerates. When the vehicle's speed becomes 8 km/h (5 MPH) or more lower than the
memorized speed, the clutch is turned ON again so that the cruise control resumes.
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