CRUISE CONTROL SYSTEM SYSTEM DESCRIPTION


  1. CRUISE CONTROL SYSTEM (for 2TR-FE)

    This system is controlled by the ECM and actuated by the throttle body. The ECM controls the following functions: ON-OFF, -SET, +RES, CANCEL, vehicle speed operation, throttle motor output control and shift down control*.

    *: for Automatic Transmission


    • 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 to open the valve when the driving speed is less than the stored speed.

    • The ECM receives signals such as ON-OFF, -SET, +RES and CANCEL from the cruise control main switch and executes the corresponding function.

    • The ECM illuminates the cruise control indicator light in the combination meter assembly in green when the cruise control system is turned on using the cruise control main switch.

    • w/ Multi-information Display:

      The cruise control indicator light (green) in the combination meter assembly goes out and a warning message is displayed when a malfunction occurs during cruise control driving.

    • A01BH40E06
      Text in Illustration
      *a Cruise Control Indicator Light (Illuminated in Green or in Yellow)
      *b Cruise Control SET Indicator

      The ECM illuminates the cruise control SET indicator light in the combination meter assembly when vehicle speed control begins after the cruise control main switch is pushed to -/SET while driving.

    • The ECM cancels cruise control when the brake pedal is depressed and the ECM receives the stop light switch signal.

    • for Automatic Transmission:

      The ECM cancels cruise control when the shift lever is moved from D to N, or other shift position.

    • for Manual Transmission:

      The ECM cancels cruise control when the clutch pedal is depressed and the ECM receives the clutch switch signal.

  2. CRUISE CONTROL SYSTEM (for 1KD-FTV)

    This system controls the vehicle speed by using the ECM to change the fuel injection quantity. The ECM controls the following functions: ON-OFF, -SET, +RES, CANCEL, vehicle speed operation and fuel injection quantity control and shift down control*.

    *: for Automatic Transmission


    • The ECM compares the driving vehicle speed from the vehicle speed sensor with the stored vehicle speed set through the cruise control switch. The ECM increases the fuel injection quantity when the driving speed is less than the stored speed.

    • The ECM receives signals such as ON-OFF, -SET, +RES and CANCEL from the cruise control main switch and executes the corresponding function.

    • w/ Multi-information Display:

      The cruise control indicator light (green) in the combination meter assembly goes out and a warning message is displayed when a malfunction occurs during cruise control driving.

    • A01BH40E06
      Text in Illustration
      *a Cruise Control Indicator Light (Illuminated in Green or in Yellow)
      *b Cruise Control SET Indicator

      The ECM illuminates the cruise control SET indicator light in the combination meter assembly when vehicle speed control begins after the cruise control main switch is pushed to -/SET while driving.

    • The ECM cancels cruise control when the brake pedal is depressed and the ECM receives the stop light switch signal.

    • for Automatic Transmission:

      The ECM cancels cruise control when the shift lever is moved from D to N, or other shift position.

    • for Manual Transmission:

      The ECM cancels cruise control when the clutch pedal is depressed and the ECM receives the clutch switch signal.

  3. 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 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.

  4. OPERATION OF CRUISE CONTROL

    The cruise control 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 (for 2TR-FE)

      When the cruise control 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. Then, the vehicle speed is stored and maintained when the cruise control switch is released.

    3. COAST CONTROL (for 1KD-FTV)

      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 fuel injection quantity signal to the injector driver. Then, the vehicle speed is stored and maintained when the cruise control switch is released.

    4. 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.

    5. ACCELERATION CONTROL (for 2TR-FE)

      The throttle motor of the throttle body 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.

    6. ACCELERATION CONTROL (for 1KD-FTV)

      While the cruise control system is in operation, if the cruise control main switch is pushed to +RES, the injector driver increases the fuel injection quantity. 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.

    7. 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 stored vehicle speeds is more than approximately 5 km/h (3 mph), the stored vehicle speed will not be changed.

    8. RES (RESUME) CONTROL

      If cruise control operation was 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.

    9. SHIFT DOWN CONTROL*


      • Overdrive may be canceled automatically when using cruise control while driving on inclined roads, etc.

      • 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.

      • If overdrive was canceled during an ACCEL or RESUME operation, overdrive will be restored after the ACCEL or RESUME operation is completed.

      *: for Automatic Transmission

    10. 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).


      • Depressing the brake pedal

      • Pulling the cruise control main switch to CANCEL

      • Driving the vehicle while the vehicle stability control system is operating

      • Turning the cruise control main switch off (the stored vehicle speed in the ECM is not maintained)

      • for Automatic Transmission:

        Moving the shift lever from D to N, or selecting 3rd, 2nd or L range

      • for Manual Transaxle:

        Depressing the clutch pedal

  5. AUTO CANCEL (FAIL-SAFE)

    This system has an automatic cancellation function (fail-safe) Click here.