CRUISE CONTROL SYSTEM


  1. FUNCTION OF MAIN COMPONENTS


    1. Constant Speed Control Mode

      Component Function
      Cruise Control Switch ON-OFF Button Turns the cruise control system on and off.
      CANCEL Switch A cancel signal is output to the ECM*1 or driving support ECU assembly*2 when this switch is operated.
      RES/+ Switch The accelerate function and resuming of a preset speed can be performed by operating this switch. A signal is output to the ECM*1 or driving support ECU assembly*2 when this switch is operated.
      SET/- Switch The decelerate function and vehicle speed setting signals are output to the ECM*1 or driving support ECU assembly*2 when this switch is operated.
      ECM

      • Controls all functions of the cruise control system in accordance with the signals from switches, sensors and ECUs.*1

      • If the ECM detects a malfunction in the cruise control system, it will store a Diagnostic Trouble Code (DTC).*1

      • Adjusts the fuel injection volume based on the signals from the driving support ECU assembly.*2
      Driving Support ECU Assembly*2

      • Receives the signals from the switches, sensors and ECUs; compares the actual vehicle speed and the set speed; and sends the cruise control demand torque signal to the ECM to control the fuel injection volume to adjust the actual speed to the set speed.

      • If the driving support ECU assembly detects a malfunction in the cruise control system, it will store a Diagnostic Trouble Code (DTC).
      Combination Meter Assembly Cruise Control Indicator Light*3

      • Based on a cruise control indicator light operation signal sent by the ECM*1 or driving support ECU assembly*2, the combination meter assembly illuminates the cruise control indicator light in green when the cruise control system has been turned on using the ON-OFF button on the cruise control switch.

      • Based on a cruise control indicator light operation signal sent by the ECM*1 or driving support ECU assembly*2, the combination meter assembly illuminates the cruise control indicator light in yellow if a malfunction occurs in the cruise control system.
      Cruise Control SET Indicator Light*3 Illuminates when the SET/- switch on the cruise control switch has been pressed to enable constant speed control at a set vehicle speed.
      Multi-information Display*4 Cruise Control Indicator

      • Based on a cruise control indicator operation signal sent by the ECM*1 or driving support ECU assembly*2, the combination meter assembly illuminates the cruise control indicator when the cruise control system has been turned on using the ON-OFF button on the cruise control switch.

      • Based on a cruise control indicator operation signal sent by the ECM*1 or driving support ECU assembly*2, the combination meter assembly turns off the cruise control indicator if a malfunction occurs in the cruise control system.
      Cruise Control SET Indicator Illuminates when the SET/- switch on the cruise control switch has been pressed to enable constant speed control at a set vehicle speed.
      Multi-information Display*4 Displays a warning message to alert the driver in accordance with a signal provided by the ECM*1 or driving support ECU assembly*2.
      Throttle Body with Motor Assembly*5 Throttle Control Motor Adjusts the throttle valve opening angle in accordance with signals from the ECM.
      Throttle Position Sensor Detects the throttle valve opening angle and outputs it to the ECM.
      Throttle Body Assembly*6 Throttle Control Motor Adjusts the throttle valve opening angle in accordance with signals from the ECM.
      Throttle Position Sensor Detects the throttle valve opening angle and outputs it to the ECM.
      Brake Actuator Assembly Skid Control ECU

      • Transmits the VSC operation signal to the ECM*1 or driving support ECU assembly*2.*7

      • Transmits the speed signal to the combination meter assembly.

      • Transmits the speed signal to the driving support ECU assembly*2.
      Speed Sensors Detects the wheel speed of each of the 4 wheels.
      Park/Neutral Position Switch Assembly*8 Detects the shift lever position and transmits signals to the ECM.
      Clutch Start Switch Assembly*9 Detects the depressing of the clutch pedal and transmits a signal to the ECM.
      Shift Lock Control Unit Assembly*8 Transmission Control Switch

      • Detects the shift lever position and transmits signals to the ECM.

      • Informs the ECM of driver upshift or downshift operations in M mode.
      Shift Paddle Switch (Transmission Shift Switch)*10 Informs the ECM of driver upshift or downshift operations in the D or M position.
      Stop Light Switch Assembly Detects the brake pedal being depressed and transmits a signal to the ECM*1 or driving support ECU assembly*2.

      *1: Except models with driving support ECU assembly

      *2: Models with driving support ECU assembly

      *3: Models with segment LCD type multi-information display

      *4: Models with dot LCD type multi-information display

      *5: Models with 1NR-FE engine or 8NR-FTS engine

      *6: Models with 1ZR-FAE engine, 1ZR-FE engine or 2ZR-FE engine

      *7: Models with vehicle stability control (VSC)

      *8: Models with multidrive/continuously variable transaxle

      *9: Models with manual transaxle

      *10: Models with shift paddle switch

    2. Speed Limiter Control Mode

      Component Function
      Speed Limiter Switch Turns speed limiter control on and off.
      Cruise Control Switch CANCEL Switch A cancel signal is output to the ECM when this switch is operated.
      RES/+ Switch 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/- Switch 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 Indicator Light*1

      • Based on a speed limiter indicator light operation signal sent by the ECM, the combination meter assembly illuminates the speed limiter indicator light in green when the speed limiter switch has been pressed to turn the speed limiter control mode on.

      • Based on a speed limiter indicator light operation signal sent by the ECM, the combination meter assembly illuminates the speed limiter indicator light in yellow if a malfunction occurs in the speed limiter control system.
      Multi-information Display Speed Limiter Indicator*2

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

      • If the ECM detects a malfunction, this light turns off to warn the driver.
      Multi-information Display

      • Shows the state of speed limiter control mode.

      • Displays a warning message to alert the driver in accordance with a signal provided by the ECM.*2
      Throttle Body with Motor Assembly*3 Throttle Control Motor Adjusts the throttle valve opening angle in accordance with signals from the ECM.
      Throttle Position Sensor Detects the throttle valve opening angle and outputs it to the ECM.
      Throttle Body Assembly*4 Throttle Control Motor Adjusts the throttle valve opening angle in accordance with signals from the ECM.
      Throttle Position Sensor Detects the throttle valve opening angle and outputs it to the ECM.
      Brake Actuator Assembly Skid Control ECU Transmits the speed signal to the combination meter assembly.
      Speed Sensors Detects the wheel speed of each of the 4 wheels.
      Accelerator Pedal Sensor Assembly Detects depressing of the accelerator pedal, whether the depressing of the accelerator pedal has exceeded the kick down mode threshold and transmits signals to the ECM.
      Clutch Start Switch Assembly*5 Detects the depressing of the clutch pedal and transmits a signal to the ECM.

      *1: Models with segment LCD type multi-information display

      *2: Models with dot LCD type multi-information display

      *3: Models with 1NR-FE engine or 8NR-FTS Engine

      *4: Models with 1ZR-FAE engine, 1ZR-FE engine

      *5: Models with manual transaxle

  2. FUNCTION


    1. The cruise control system has the following functions:

      Constant Speed Control Mode
      Function Outline
      Set Control When the cruise control switch is turned on and the cruise control switch is pressed to the SET/- direction and released, the ECM*1 or driving support ECU assembly*2 stores the vehicle speed in memory and continues to control the vehicle at that speed. The set speed is approximately 40 km/h (25 mph) or more.
      Coast Control

      When the cruise control switch is held to the SET/- direction while the cruise control system is running, 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 switch is released. From then on, the ECM controls the vehicle speed at that speed constantly.*1

      The driving support ECU assembly compares the actual vehicle speed to the set speed and if the vehicle speed is lower than the set speed, the driving support ECU assembly increases the requested motive force.*2
      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 by approximately 1.6 km/h (1 mph) each time by operating the cruise control switch in the SET/- direction quickly within approximately 0.6 seconds.
      Accelerator Control When the cruise control switch is kept pushed to the RES/+ direction while the cruise control system is running, the throttle control motor is energized in the throttle opening direction. The vehicle keeps accelerating and the ECM*1 or driving support ECU assembly*2 stores the vehicle speed when the cruise control switch is released. From then on, the ECM*1 or driving support ECU assembly*2 controls the vehicle speed at that speed constantly.
      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 by approximately 1.6 km/h (1 mph) each time by operating the cruise control switch in the RES/+ direction quickly within approximately 0.6 seconds.
      Low Speed Limit Control The low speed limit is the lowest speed that the cruise control system can be set to and is set at approximately 40 km/h (25 mph). The cruise control system cannot be set below that speed. If the vehicle speed drops below that speed while running in the cruise control system, the cruise control system is canceled automatically.
      Resume Control After the cruise control system is canceled by a switch other than the cruise control switch, the mode can be resumed and controlled at the set speed by operating the cruise control switch in the RES/+ direction when the vehicle speed returns 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 cruise control system is running, the cruise control system is canceled accordingly.


      • Stop light switch on signal (the brake pedal is depressed)

      • Signal to move the shift lever from D to N*3

      • When 1st, 2nd or 3rd range is selected in M mode.*3

      • When 1st, 2nd or 3rd range is selected in D position by shift paddle switch.*4

      • CANCEL switch on signal

      • Cruise control switch ON-OFF button off signal

      • Clutch start switch assembly off signal*5

      • Speed limiter main switch on signal*6
      Automatic Cancel Control

      If any of the following conditions occur during cruise control speed control operation, the speed that is set in memory is cleared and cruise control speed control operation is canceled.


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

      • The vehicle speed signal is abnormal.

      Furthermore, the cruise control indicator light will illuminate in yellow until the cruise control system is turned off using the cruise control switch, and the operation of the cruise control is disabled until the cruise control system is turned on again using the ON-OFF button.*7

      Furthermore, the cruise control indicator will turn off until the cruise control system is turned off using the cruise control switch, and the operation of the cruise control is disabled until the cruise control system is turned on again using the ON-OFF button.*8

      If the following condition occurs during cruise control speed control operation, the speed that is set in memory is cleared and cruise control speed control operation is canceled.


      • The ETCS-i*9 or ECD*10 has a malfunction.

      Furthermore, the cruise control indicator light will turn off until the cruise control system is turned off using the cruise control switch, and the operation of the cruise control is disabled until the cruise control system is turned on again using the ON-OFF button.*7

      Furthermore, the cruise control indicator will turn off until the cruise control system is turned off using the cruise control switch, and the operation of the cruise control is disabled until the cruise control system is turned on again using the ON-OFF button.*8

      If any of the following conditions occur during cruise control speed control operation, the speed that is set in memory is cleared and cruise control is canceled.


      • The stop light switch input signal is abnormal.

      • The cancel circuit has a malfunction.

      Furthermore, the cruise control indicator light will illuminate in yellow and a message indicating a malfunction will be displayed on the multi-information display until the cruise control system is turned off using the cruise control switch, and the operation of the cruise control is disabled until the engine switch is turned off.*7

      Furthermore, the cruise control indicator will turn off and a message indicating a malfunction will be displayed on the multi-information display until the cruise control system is turned off using the cruise control switch, and the operation of the cruise control is disabled until the ignition switch is turned off.*8

      When any of the following conditions occurs while the cruise control system is running, speed control by the cruise control system is canceled. The cruise control system can be resumed at the set speed by operating the cruise control switch in the SET/- or RES/+ direction providing that the vehicle speed is above the low speed limit (approximately 40 km/h [25 mph]).


      • The vehicle speed falls below the low speed limit (approximately 40 km/h [25 mph]). The set speed in memory is maintained.

      • The vehicle speed drops more than 16 km/h (10 mph) below the set speed. The set speed in memory is cleared.
      Other Cancelation Items*11 While the vehicle is being driven under cruise control system, cruise control will be canceled if the VSC is activated. The set speed in memory is maintained.

      *1: Except models with driving support ECU assembly

      *2: Models with driving support ECU assembly

      *3: Models with multidrive/continuously variable transaxle

      *4: Models with shift paddle switch

      *5: Models with manual transaxle

      *6: Models with speed limiter control

      *7: Models with segment LCD type multi-information display

      *8: Models with dot LCD type multi-information display

      *9: Models with 1NR-FE engine, 1ZR-FAE engine, 1ZR-FE engine, 2ZR-FE or 8NR-FTS engine

      *10: Models with 1ND-TV engine or 1WW engine

      *11: Models with Vehicle Stability Control (VSC)

      Speed Limiter Control Mode
      Function Outline
      Set Control When the driver turns on the speed limiter switch, the speed limiter indicator light will illuminate in the combination meter assembly. In this state, when the cruise control 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 switch as a limit speed, and display the limit speed on the combination meter assembly (If the cruise control 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 memorize the limit speed as being approximately 30 km/h [20 mph]).
      Constant Speed Control When 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*1, or 4 fuel injector assembly*2. Thus, the system reduces the actual vehicle speed to the limit speed.
      Coast Control If the driver continues to press the cruise control 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 switch, that speed will be rendered as the set speed.
      Tap-down Control If the driver presses the cruise control switch momentarily (approximately 0.6 seconds) in the SET/- direction, the system will reduce the limit speed by 1 km/h or 1 mph with each press of the switch.
      Accelerator Control If the driver continues to press the cruise control 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 switch, that speed will be rendered as the limit speed.
      Tap-up Control If the driver presses the cruise control switch momentarily (approximately 0.6 seconds) in the RES/+ direction, the system will increase the limit speed by 1 km/h or 1 mph with each press of the switch.
      Override Control While driving the vehicle with speed limiter control mode on, if the driver fully depresses the accelerator pedal, the ECM will detect that the accelerator pedal position sensor is in 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 speed limiter control mode on, if any one of the following signals is input into the ECM, the system will cancel speed limiter control mode:


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

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

      • Cruise control switch on signal (transfers to the constant speed control mode, turns off the speed limiter indicator light, and deletes the limit speed).
      Resume Control After turning the CANCEL switch on to turn speed limiter control mode off, if the driver pushes the cruise control switch in the RES/+ direction, the system will limit the vehicle speed at the limit speed that was set at the time of cancelation.

      *1: Models with 1NR-FE engine, 1ZR-FAE engine, 1ZR-FE engine or 8NR-FTS engine

      *2: Models with 1ND-TV or 1WW engine

  3. DIAGNOSIS


    1. If a malfunction occurs in the cruise control system during constant speed control operation, the ECM*1 or driving support ECU assembly*2 automatically cancels control and turns off both the cruise control indicator and the cruise control SET indicator. At this time, "Check cruise control system" is displayed on the multi-information display. The ECM*1 or driving support ECU assembly*2 stores the malfunction in the form of a 5-digit Diagnostic Trouble Code (DTC).*3

    2. If a malfunction occurs in the cruise control system during constant speed control operation, the ECM*1 or driving support ECU assembly*2 automatically cancels control and illuminates the cruise control indicator light in yellow to inform the driver of the malfunction. At this time, the ECM*1 or driving support ECU assembly*2 stores the malfunction in the form of a 5-digit Diagnostic Trouble Code (DTC).*4

    3. If a malfunction occurs in the cruise control system during speed limiter control operation, the ECM automatically cancels control and turns off the speed limiter indicator. At this time, "Check speed limiter system" is displayed on the multi-information display. The ECM stores the malfunction in the form of a 5-digit Diagnostic Trouble Code (DTC).*3

    4. If a malfunction occurs in the cruise control system during speed limiter control operation, the ECM automatically cancels control and illuminates the speed limiter indicator light in yellow. At this time, the ECM stores the malfunction in the form of a 5-digit Diagnostic Trouble Code (DTC).*4

    5. The 5-digit DTC can be read by connecting the Global TechStream (GTS) to the DLC3. For details, refer to the Repair Manual.

      *1: Except models with driving support ECU assembly

      *2: Models with driving support ECU assembly

      *3: Models with dot LCD type multi-information display

      *4: Models with segment LCD type multi-information display