CRUISE CONTROL SYSTEM


  1. FUNCTION OF MAIN COMPONENTS


    1. The main components in the cruise control system have the following functions:

      Component Function
      Cruise Control Main Switch "ON-OFF" Button Turns the power to the cruise control system on and off.
      "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.
      Combination Meter Assembly Cruise Main Indicator Light (Green) Illuminates when the "ON-OFF" button on the cruise control main switch has been pressed to turn the cruise control system on.
      Cruise Main Indicator Light (Yellow) If the ECM detects a malfunction, this light illuminates to warn the driver.
      Cruise SET Indicator Light Illuminates when the vehicle speed is set.
      Throttle Body with Motor 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 Detects the vehicle speed and transmits a signal via the skid control ECU to the combination meter assembly.
      Accelerator Pedal Sensor Assembly Detects the accelerator pedal depression degree and outputs it to the ECM.
      Stop Light Switch Assembly Detects the depressing of the brake pedal and transmits a signal to the ECM.
      Clutch Switch Assembly*1 Detects the depressing of the clutch pedal and transmits a signal to the ECM.
      Park/Neutral Position Switch Assembly*2 Detects the shift position and transmits a signal to the ECM.
      Transmission Control Switch*2 Detects a shift (up/down) operation and outputs a signal to the ECM while the D or M shift position is being selected.

      Shift Paddle Switch

      (Transmission Shift Switch Assembly)*3

      		 Detects a shift (up/down) operation and outputs a signal to the ECM while the D or M shift position is being selected.

      • *1: Models with manual transaxle

      • *2: Models with CVT

      • *3: Models with shift paddle switch (transmission shift switch assembly)

  2. FUNCTION


    1. The cruise control has the following control functions:

      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 approximately 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 cruise control, 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 or less. 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 pushed.
      Accelerator Control When the cruise control main switch is kept pushed to the "+ RES" direction while the vehicle is running in the cruise control, 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 or less. 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 cruise control can be set to and is set at approximately 40 km/h (25 mph). The cruise control cannot be set below that speed. If the vehicle speed drops below that speed while running in the cruise control, the cruise control is canceled automatically. However the set speed is kept in memory.
      Resume Control

      • When the cruise control has been canceled by something other than the "ON-OFF" button operation, the cruise control 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]).


        • If the vehicle speed is below the low speed limit, the system will not delete the speed in the memory, allowing cruise control mode to be resumed once the vehicle speed reaches above the low speed limit.
      Manual Cancel Control

      • If any of the following signals is sent to the ECM, the cruise control is cancelled accordingly.


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

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

        • Selects range 3 or lower while the M shift position is being selected (shift lever assembly operation). *1

        • Selects range 3 or lower while the D or M shift position is being selected (shift paddle switch operation).*2

        • Clutch switch assembly off signal (depress the clutch pedal).*3

        • "CANCEL" switch on signal.

        • "ON-OFF" button off signal.

        • VSC operation.
      Automatic Cancel Control

      • When any of the following conditions occurs during cruise control operation, the set speed in the memory is cleared to cancel the cruise control. Furthermore, the cruise main indicator light illuminates (yellow) until the "ON-OFF" button is turned off, and the operation of the cruise control 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 cruise control, the speed that is set in the memory is cleared and the cruise control is cancelled. Furthermore, the operation of the cruise control 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 cruise control, the set speed in the memory is cleared to cancel the cruise control. Furthermore, the cruise main indicator light illuminates (yellow) until the "ON-OFF" button is turned off, and the operation of the cruise control 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 cruise control, the speed that is set in the memory is cleared and the cruise control is cancelled.


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

      • When the following condition occurs during cruise control, the cruise control is cancelled.


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

      • *1: Models with CVT

      • *2: Models with shift paddle switch (transmission shift switch assembly)

      • *3: 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.

        A005GCDE04
        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 provides a cruise main indicator light and cruise SET indicator light to indicate in the cruise control system.

        Condition A005FUS A005FUN
        Set Standby Illuminates (Green) -
        Being Controlled Illuminates (Green) Illuminates
        System Malfunction Illuminates (Yellow) -

  5. DIAGNOSIS


    1. If a malfunction occurs in the cruise control system, the ECM cancels the cruise control system. The ECM illuminates (yellow) the cruise main indicator light to inform the driver of a malfunction. 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.