CRUISE CONTROL SYSTEM


  1. FUNCTION OF MAIN COMPONENTS


    1. Constant Speed Control Mode

      Component Function
      Cruise Control Main Switch "ON-OFF" Button Turns on/off the power to the constant speed control mode.
      "CANCEL" A cancel signal can be output to the ECM through the operation of this switch.
      "+ RES" The acceleration function and resume control function can be performed by operating this switch. A signal is output to the ECM when this switch is operated.
      "- SET" The deceleration function and set control function can be performed by operating this switch. A signal is output to the ECM when this switch is operated.
      ECM

      • Controls the constant speed control mode in accordance with signals from the switches, sensors and ECUs.

      • If the ECM detects a malfunction in the cruise control system, it will store a Diagnostic Trouble Code (DTC).
      Skid Control ECU Transmits the VSC operation signal to the ECM.*1
      Combination Meter Assembly Cruise Main Indicator Light

      • Illuminates when the "ON-OFF" button on the cruise control main switch has been pressed to turn the constant speed control mode on.

      • If the ECM detects a malfunction, this light blinks to warn the driver.
      Cruise SET Indicator Light Illuminates when the vehicle speed is set.
      Throttle with Motor Body Assembly Throttle Control Motor Adjusts the throttle valve to the limiter position in accordance with signals from the ECM.
      Throttle Position Sensor Transmits the throttle valve position information to the ECM.
      Front Speed Sensor LH/RH, Rear Speed Sensor LH/RH (Skid Control Sensor Wire LH/RH) Detects the vehicle speed and transmits a signal via the skid control ECU to the combination meter assembly.
      Stop Light Switch Assembly Detects the depressing of the brake pedal and transmits a signal to the ECM.
      Clutch Switch Assembly*2 Detects the depressing of the clutch pedal and transmits a signal to the ECM.
      Park/Neutral Position Switch Assembly*3 Detects the shift position and transmits a signal to the ECM.
      Transmission Control Switch*3 Detects a signal when the shift lever is moved from D to M, or from M to "+" or from M to "-", and transmits it to the ECM.
      Shift Paddle Switch (Transmission Shift Switch Assembly)*3 Detects a shift paddle switch (transmission shift switch assembly) operation when it is operated, and transmits a signal to the ECM.

      • *1: Models with ABS with EBD, Brake Assist, TRC and VSC

      • *2: Models with manual transaxle

      • *3: Models with CVT

    2. Speed Limiter Control Mode

      Component Function
      Speed Limiter Main Switch Turns on/off the power to the speed limiter control mode.
      Cruise Control Main Switch "CANCEL" A cancel signal can be output to the ECM through the operation of this switch.
      "+ RES" The acceleration function and resume control function can be performed by operating this switch. A signal is output to the ECM when this switch is operated.
      "- SET" The deceleration function and set control function can be performed by operating this switch. A signal is output to the ECM when this switch is operated.
      ECM

      • Controls the speed limiter control mode in accordance with signals from the switches and sensors.

      • If the ECM detects a malfunction in the cruise control system, it will store a Diagnostic Trouble Code (DTC).
      Combination Meter Assembly Speed Limiter Main Indicator Light

      • Illuminates when the speed limiter main switch has been pressed to turn the speed limiter control mode on.

      • If the ECM detects a malfunction, this light blinks to warn the driver.
      Multi-information Display Shows the state of the speed limiter control mode.
      Throttle with Motor Body Assembly Throttle Control Motor Adjusts the throttle valve to the limiter position in accordance with signals from the ECM.
      Throttle Position Sensor Transmits the throttle valve position information to the ECM.
      Speed Sensor Detects the vehicle speed and transmits a signal via the skid control ECU to the combination meter assembly.
      Accelerator Pedal Sensor Assembly Detects whether the accelerator pedal is in the kick down mode and transmits signals to the ECM.
      Clutch Switch Assembly* Detects the depressing of the clutch pedal and transmits a signal to the ECM.

      • *: Models with manual transaxle

  2. FUNCTION


    1. Constant Speed Control Mode

      Function Outline
      Constant Speed Control The ECM compares the actual vehicle speed and the set speed and if the vehicle speed is lower than the set speed, it uses the throttle control motor to increase the throttle opening.
      Set Control When the "ON-OFF" button is turned on and the cruise control main switch is pressed in the "- SET" direction and released, the ECM stores the vehicle speed in the memory and continues to control the vehicle at that speed. The set speed is between 40 km/h (25 mph) and 200 km/h (125 mph).
      Coast Control When the cruise control main switch is held down in the "- SET" direction while the vehicle is running in the constant speed control mode, the throttle control motor is energized in the throttle closing direction, and the vehicle keeps decelerating. The ECM stores the vehicle speed when the cruise control main switch is released. From then on, the ECM continues to control the vehicle at that speed.
      Tap-down Control When the difference between the actual vehicle speed and the set speed is less than 5 km/h (3 mph), the set speed can be lowered in steps of approximately 1.6 km/h (1 mph) by operating the cruise control main switch in the "- SET" direction quickly within approximately 0.6 seconds. However, if the difference between the actual vehicle speed and the set speed is greater than 5 km/h (3 mph), the set speed will change to the speed at which the vehicle was traveling at when the switch was released.
      Accelerator Control When the cruise control main switch is kept pushed to the "+ RES" direction while the vehicle is running in the constant speed control mode, the throttle control motor is energized in the throttle opening direction. The vehicle keeps accelerating and the ECM stores the vehicle speed when the cruise control main switch is released. From then on, the ECM continues to control the vehicle at that speed.
      Tap-up Control When the difference between the actual vehicle speed and the set speed is less than 5 km/h (3 mph), the set speed can be increased in steps of approximately 1.6 km/h (1 mph) by operating the cruise control main switch in the "+ RES" direction quickly within approximately 0.6 seconds. However, if the difference between the actual vehicle speed and the set speed is greater than 5 km/h (3 mph), the set speed will not change.
      Low Speed Limit Control The low speed limit is the lowest speed that the constant speed control mode can be set to and is set at approximately 40 km/h (25 mph). The constant speed control mode cannot be set below that speed. If the vehicle speed drops below that speed while running in the constant speed control mode, the constant speed control mode is canceled automatically. However the set speed is kept in memory.
      Resume Control When the constant speed control mode has been canceled by something other than the "ON-OFF" button operation, the mode can be resumed and controlled at the set speed by operating the cruise control main switch in the "+ RES" direction when the vehicle speed returns to above the low speed limit (approximately 40 km/h [25 mph]).
      Manual Cancel Control

      • If any of the following signals is sent to the ECM while the vehicle is running in the constant speed control mode, the constant speed control mode is canceled accordingly.


        • Stop light switch assembly on signal (depress the brake pedal).

        • Signal to move the shift lever to any position other than D.*1

        • Clutch switch assembly off signal (depress the clutch pedal).*2

        • Signal to move the shift lever to any position other than D or M. Or, signal when any one of M1, M2, M3, D1, D2 or D3 range is selected.*1

        • "CANCEL" switch on signal.

        • "ON-OFF" button off signal.

        • VSC operation.*3
      Automatic Cancel Control

      • When any of the following conditions occurs during constant speed control mode, the set speed in the memory is cleared to cancel the constant speed control mode. Furthermore, the cruise main indicator light blinks until the "ON-OFF" button is turned off, and the operation of the constant speed control mode is disabled until the "ON-OFF" button is turned on again.


        • The stop light switch assembly has an open or short circuit.

        • The vehicle speed signal is abnormal.

      • When the following condition occurs during constant speed control mode, the speed that is set in the memory is cleared and the constant speed control mode is cancelled. Furthermore, the operation of the constant speed control mode will be disabled until the "ON-OFF" button is turned on again.


        • ETCS-i has a malfunction.

      • When any of the following conditions occurs during the constant speed control mode, the set speed in the memory is cleared to cancel the constant speed control mode. Furthermore, the cruise main indicator light blinks until the "ON-OFF" button is turned off, and the operation of the constant speed control mode is disabled until the ignition switch is turned off.


        • The stop light switch assembly input signal is abnormal.

        • The cancel circuit has a malfunction.

      • When the following condition occurs during constant speed control mode, the speed that is set in the memory is cleared and the constant speed control mode is cancelled.


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

      • When the following condition occurs during constant speed control mode, the constant speed control mode is cancelled.


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

      • *1: Models with CVT

      • *2: Models with manual transaxle

      • *3: Models with ABS with EBD, Brake Assist, TRC and VSC

    2. Speed Limiter Control Mode

      Function Outline
      Constant Speed Control When the speed limiter control mode is on, the ECM will compare the actual vehicle speed with the limit speed. If the actual vehicle speed is greater than the limit speed, the ECM will control the throttle control motor in the closing direction. Thus, the system reduces the actual vehicle speed to the limit speed.
      Set Control When the driver turns on the speed limiter main switch, the speed limiter main indicator light will illuminate in the combination meter assembly. In this state, when the cruise control main switch is pressed in the "- SET" direction, the system will memorize the speed that the vehicle was traveling at prior to the operation of the cruise control main switch as a limit speed, and display the limit speed on the combination meter assembly (If the cruise control main switch is pressed in the "- SET" direction while the vehicle is being driven at 30 km/h [20 mph] or less, or while the vehicle is stopped, the system will store the limit speed as being approximately 30 km/h [20 mph]).
      Coast Control If the driver continues to press the cruise control main switch in the "- SET" direction, the system will reduce the limit speed in 5 km/h or 5 mph increments. The instant the driver releases the cruise control main switch, that speed will be stored as the set speed.
      Tap-down Control If the driver presses the cruise control main switch momentarily (for approximately 0.6 seconds) in the "- SET" direction, the system will reduce the limit speed by 1 km/h or 1 mph with each pressing of the switch.
      Accelerator Control If the driver continues to press the cruise control main switch in the "+ RES" direction, the system will increase the limit speed in 5 km/h or 5 mph increments. The instant the driver releases the cruise control main switch, that speed will be stored as the limit speed.
      Tap-up Control If the driver presses the cruise control main switch momentarily (for approximately 0.6 seconds) in the "+ RES" direction, the system will increase the limit speed by 1 km/h or 1 mph with each pressing of the switch.
      Override Control While driving the vehicle with the speed limiter control mode on, if the driver fully depresses the accelerator pedal, the ECM will detect that the accelerator pedal sensor assembly is in the kick down mode. Then, the ECM will recognize this to be the driver's acceleration requirement, and allow the vehicle to accelerate higher than the limit speed. After the acceleration, when the vehicle speed falls below the limit speed, this function will resume limit speed control.
      Cancel Control

      • While the vehicle is being driven with the speed limiter control mode on, if any one of the following signals is input into the ECM, the system will cancel the speed limiter control mode:


        • "CANCEL" switch on signal (the driver has pressed the cruise control main switch in the "CANCEL" direction).

        • Speed limiter main switch off signal (deletes the limit speed).

        • "ON-OFF" button on signal (transfers to the constant speed control mode, turns off the speed limiter main indicator light, and deletes the limit speed).
      Resume Control After turning the "CANCEL" switch on to turn the speed limiter control mode off, if the driver pushes the cruise control main switch in the "+ RES" direction, the system will limit the vehicle speed at the limit speed that was set at the time of cancellation.
      Other Cancellation Items

      • While the clutch pedal is depressed, the system temporarily deactivates the speed limiter control mode.*

      • If the ignition switch is turned off, the limit speed is deleted.

      • *: Models with manual transaxle

  3. CONSTRUCTION


    1. Cruise Control Main Switch


      1. The cruise control main switch consists of the "ON-OFF" button, "+ RES", "- SET" and "CANCEL" switches. The "+ RES", "- SET" and "CANCEL" switches are operated using a lever that operates in 3 directions.

      2. The cruise control main switch is an automatic reset (normally open) type that turns on only when the switch is being operated and turns off as soon as the driver releases the switch. Furthermore, the functions of the control switch are active only when the cruise control system has been turned on.

        A01UWDWE09
        Text in Illustration
        *1 Cruise Control Main Switch - -
        *a "ON-OFF" Button *b "+ RES"
        *c "- SET" *d "CANCEL"

  4. OPERATION


    1. Combination Meter Assembly


      1. The combination meter assembly illuminates an indicator light or gives an indication on the multi-information display.

        Mode Condition A01UW9R A01UWN5 A01UVW6 Multi-information Display
        Constant Speed Control "ON-OFF" Button On Illuminates - - -
        Mode Set Illuminates Illuminates - -
        Malfunction Occurred Blinks - - -
        Speed Limiter Control* Speed Limiter Main Switch On - - Illuminates -
        Mode Set Effecting Control - - Illuminates A01UVYX
        Set Speed Exceeded - - Illuminates A01UVYX A01UWKI A01UWQN

        • The indication comes on and off repeatedly.
        Malfunction Occurred - - Blinks -

        • *: Models with speed limiter control mode

  5. DIAGNOSIS


    1. If a malfunction occurs in the cruise control system, the ECM cancels the cruise control system. The ECM blinks the cruise main indicator light or the speed limiter main indicator light* to inform the driver of a malfunction. Furthermore, the ECM displays a warning message on the multi-information display when in speed limiter control mode*. At this time, the ECM memorizes the malfunction in the form of a 5-digit Diagnostic Trouble Code (DTC). For details of the DTC, refer to the Repair Manual.


      • *: Models with speed limiter control mode