CRUISE CONTROL SYSTEM (for Hatchback) > SYSTEM DESCRIPTION



CRUISE CONTROL SYSTEM
This system is controlled by the ECM and actuated by the throttle body with motor assembly. The ECM controls the following functions: ON-OFF, -SET, +RES, CANCEL, vehicle speed operation, throttle motor output control and shift down control.
  1. The ECM compares the driving vehicle speed from the vehicle speed sensor with the stored vehicle speed set through the cruise control main switch. The ECM controls the throttle motor of the throttle body with motor assembly to open the valve when the driving speed is less than the stored speed.
  2. The ECM receives signals, such as ON-OFF, -SET, +RES and CANCEL, from the cruise control main switch and executes the corresponding function.
  3. The ECM illuminates the cruise control indicator light in the combination meter assembly when it receives the cruise control main switch on signal.
  4. The ECM illuminates the cruise control SET indicator light in the combination meter assembly when the cruise control system is operated by pushing the cruise control main switch to -SET.
  5. The ECM cancels cruise control when the brake pedal is depressed and the ECM receives the stop light switch signal.
  6. for Automatic Transaxle:
    The ECM cancels cruise control when the shift lever is moved from D to a position other than D.
  7. for Manual Transaxle:
    The ECM cancels cruise control when the clutch pedal is depressed.

LIMIT CONTROL

  1. Low speed limit
    The lower limit of the speed setting range is set at approximately 40 km/h (25 mph). The cruise control system cannot be set when the driving vehicle speed is below the low speed limit. The cruise control operation will be automatically canceled but the stored vehicle speed will be retained when the vehicle speed decreases below the low speed limit of approximately 40 km/h (25 mph) while cruise control is in operation.

  2. High speed limit
    The upper limit of the speed setting range is set at approximately 200 km/h (125 mph). The cruise control system cannot be set when the driving vehicle speed is over the high speed limit. Also, +RES cannot be used to increase speed beyond the high speed limit.


OPERATION OF CRUISE CONTROL
The cruise control main switch is used to operate 7 functions: SET, COAST, TAP-DOWN, RES (RESUME), ACCELERATION, TAP-UP and CANCEL. The SET, TAP-DOWN and COAST functions and the RES (RESUME), TAP-UP and ACCELERATION functions are operated with the same switch. The cruise control main switch is an automatic return type switch which turns on only while holding it in each direction and turns off after releasing it.

  1. SET CONTROL
    The vehicle speed is stored and constant speed control is initiated when pushing the switch to -SET while driving with the cruise control main switch on (the cruise control indicator light is on) and with the vehicle speed within the set speed range (between the low and high speed limits).

  2. COAST CONTROL
    When the cruise control main switch is pushed to -SET and held in that position while the cruise control system is operating, the ECM sends a throttle valve opening angle 0° demand signal to the throttle body with motor assembly. Then, the vehicle speed is stored and maintained when the cruise control main switch is released.

  3. TAP-DOWN CONTROL
    When tapping down the cruise control main switch to -SET (for approximately 0.6 seconds) while the cruise control system is in operation, the stored vehicle speed decreases each time by approximately 1.6 km/h (1.0 mph). However, when the difference between the driving and stored vehicle speeds is more than approximately 5 km/h (3 mph), the stored vehicle speed is set to the actual vehicle speed at the moment the cruise control main switch is released from -SET and constant speed control is initiated.

  4. ACCELERATION CONTROL
    The throttle motor of the throttle body with motor assembly is instructed by the ECM to open the throttle valve when the cruise control main switch is pushed to +RES and held while the cruise control system is in operation. When the cruise control main switch is released from +RES, the vehicle speed is stored and the vehicle is controlled in order to maintain a constant speed.

  5. TAP-UP CONTROL
    When tapping up the cruise control main switch to +RES (for approximately 0.6 seconds) while the cruise control system is in operation, the stored vehicle speed increases each time by approximately 1.6 km/h (1.0 mph). However, when the difference between the driving and the stored vehicle speed is more than approximately 5 km/h (3 mph), the stored vehicle speed will not be changed.

  6. RES (RESUME) CONTROL
    If cruise control operation is canceled with the stop light switch, CANCEL switch, etc., and if the driving speed is within the set speed range, pushing the cruise control main switch to +RES restores the vehicle speed memorized at the time of cancellation, and initiates constant speed control.

  7. SHIFT DOWN CONTROL

    1. Overdrive may be canceled automatically when using cruise control while driving on inclined roads, etc.
    2. After overdrive is canceled, if the system determines that the road is no longer inclined based on the throttle valve opening amount, overdrive will be restored.
    3. If overdrive is canceled during an ACCEL or RESUME operation, overdrive will be restored after the ACCEL or RESUME operation is completed.

  8. MANUAL CANCEL CONTROL
    Performing any of the following cancels cruise control while the system is operating (the stored vehicle speed in the ECM is maintained).

    1. Depressing the brake pedal
    2. Pulling the cruise control main switch to CANCEL
    3. Driving the vehicle while the vehicle stability control system is operating
    4. Turning the cruise control main switch off (the stored vehicle speed in the ECM is not maintained)
    5. for Automatic Transaxle:
      Moving the shift lever from D to a position other than D.
    6. for Manual Transaxle:
      Depressing the clutch pedal

AUTO CANCEL (FAIL-SAFE)
This system has an automatic cancellation function (fail-safe) (Click here).