CRUISE CONTROL SYSTEM SYSTEM DESCRIPTION


  1. CRUISE CONTROL SYSTEM

    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, COAST, RES, ACCEL, 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 main switch. When the actual vehicle speed exceeds the stored vehicle speed, the ECM decreases the fuel injection quantity. When the actual vehicle speed is less than the stored vehicle speed, the ECM increases the fuel injection quantity.

    • The ECM receives signals such as ON-OFF, SET, COAST, RES, ACCEL, and CANCEL from the cruise control main switch and executes the command.

    • The ECM illuminates the combination meter assembly cruise control indicator light when it receives the cruise control main switch on signal.

    • The ECM turns off the combination meter assembly cruise control indicator light and displays a warning message when a malfunction occurs during cruise control driving.

    • B003OYNC33
      *1 Cruise Control Indicator Light
      *2 Cruise Control SET Indicator Light

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

    • The ECM cancels control of vehicle speed when the brake pedal is depressed and the ECM receives a signal from the stop light switch assembly.

    • for Manual Transmission:

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

    • for Automatic Transmission:

      The ECM cancels control of vehicle speed when the shift lever is moved from D or S to any other position.

      The ECM cancels control of vehicle speed when the shift lever is used to select the 3rd, 2nd or 1st range with the shift lever in S.

      w/ Transmission Shift Switch:

      The ECM cancels cruise control when it detects that the transmission is changed from 4th gear to 3rd, 2nd or 1st gear with the transmission shift switch assembly while the shift lever is in D or S.

    • The ECM cancels control of vehicle speed when the cruise control main switch is pulled to CANCEL.

    • The ECM cancels control of vehicle speed when the cruise control system is turned off using the cruise control main switch.

  2. LIMIT CONTROL


    1. Low speed limit

      The lowest possible set speed is approximately 40 km/h (25 mph). The cruise control system cannot be set when the vehicle speed is below the low speed limit. Control of vehicle speed will be automatically canceled but the stored vehicle speed will be retained when the vehicle speed drops below the low speed limit while the cruise control is controlling vehicle speed.

    2. High speed limit

      The highest possible set speed is approximately 200 km/h (124 mph). The cruise control system cannot be set when the vehicle speed is over the high speed limit. Also, +RES cannot be used to increase the speed beyond the high speed limit.

  3. OPERATION OF CRUISE CONTROL

    The cruise control main switch is used to turn the cruise control system on and off, as well as operate 7 functions: SET, - (COAST), TAP-DOWN, RES (RESUME), + (ACCEL), TAP-UP, and CANCEL. The SET, TAP-DOWN, and - (COAST) functions, and the RES (RESUME), TAP-UP, and + (ACCEL) functions are operated with the same switch. The cruise control main switch is an automatic return type switch which turns on only while being operated in the direction of each arrow, and turns off when it is released.


    1. SET CONTROL

      The vehicle speed is stored and speed control begins when the cruise control main switch is pushed to -SET while driving with the cruise control system on (while the cruise control indicator light is illuminated), and the vehicle speed is 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 fuel injection quantity signal. Then, the vehicle speed is stored and maintained when the cruise control main switch is released.

    3. TAP-DOWN CONTROL

      When the cruise control system is controlling vehicle speed and the cruise control main switch is tapped to the -SET side (for approximately 0.6 seconds or less), the stored vehicle speed decreases by approximately 1.6 km/h (1 mph) for each time the switch is tapped. When the cruise control main switch is tapped to -SET and the difference between the current and stored vehicle speed is more than approximately 5 km/h (3 mph), the current vehicle speed is stored and speed control is performed.

    4. ACCELERATION CONTROL

      While the cruise control system is in operation, if the cruise control main switch is pushed to +RES, the ECM 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.

    5. TAP-UP CONTROL

      When the cruise control system is controlling vehicle speed and the cruise control main switch is tapped to the +RES side (for approximately 0.6 seconds or less), the stored vehicle speed increases by approximately 1.6 km/h (1 mph) for each time the switch is tapped. When the cruise control main switch is tapped to +RES and the difference between the current and stored vehicle speed is more than approximately 5 km/h (3 mph), the stored vehicle speed will not be changed.

    6. RESUME CONTROL

      If control of vehicle speed by the cruise control system was canceled due to any of the manual cancel conditions (other than turning the cruise control system off using the cruise control main switch), and if the vehicle speed is between the low and high speed limits, the stored vehicle speed from the time of cancelation will be resumed and maintained when the cruise control main switch is pushed to +RES.

    7. SHIFT DOWN CONTROL*

      When the vehicle is traveling uphill using cruise control, automatic transmission control may cause the transmission to shift down. During shift down control, when the end of uphill travel is determined, the transmission will shift up after a certain period of time. When the transmission shifts down during the accelerator control or the resume control, the transmission will shift up after the accelerator control or the resume control ends.


      • *: for Automatic Transmission

    8. CANCEL CONTROL


        Manual cancel

      • Performing any of the following cancels control of vehicle speed by the cruise control system (the stored vehicle speed in the ECM is maintained).


        • Depressing the brake pedal.

        • for Manual Transmission:

          Depressing the clutch pedal.

        • for Automatic Transmission:

          Moving the shift lever to any position except D or S (6th, 5th or 4th gear).

          w/ Transmission Shift Switch:

          The transmission is changed from 4th gear to 3rd, 2nd or 1st gear with the transmission shift switch assembly while the shift lever is in D or S.

        • Pulling the cruise control main switch to CANCEL.

      • Performing any of the following cancels control of vehicle speed by the cruise control system (the stored vehicle speed in the ECM is not maintained).


        • Turning the cruise control system off using the cruise control main switch (ON/OFF)


        Auto cancel

      • Performing any of the following cancels the cruise control system (the stored vehicle speed in the ECM is maintained).


        • Vehicle speed decreases below the low speed limit approximately 40 km/h (25 mph).

        • VSC operates while the vehicle is in motion.

        • TRC operates for certain amount of time while driving with cruise control system controlling vehicle speed.

        • TRC and VSC are off.

        • Switching between 2WD and 4WD.

      • Performing any of the following cancels the cruise control system (the stored vehicle speed in the ECM is not maintained).


        • Vehicle speed decreases by 16 km/h (10 mph) or more below the speed at which the cruise control is set.

  4. AUTO CANCEL (FAIL-SAFE)

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

    Click here