CRUISE CONTROL SYSTEM DETAILS


  1. FUNCTION OF MAIN COMPONENTS

    Component Function
    Cruise Control Main Switch ON-OFF Button Turns on/off the power to the cruise control system.
    CANCEL Switch A cancel signal can be output to the ECM through the operation of this switch.
    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.
    Injector Assemblies*1 Adjusts the fuel injection volume based on the signals from the injector driver.
    Stop Light Switch Assembly Detects the depressing of the brake 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.
    Combination Meter Assembly Cruise Control Indicator Light

    • Illuminates when the cruise control main switch has been pressed to turn the cruise control system on.

    • If the ECM detects a malfunction, this light illuminates in yellow to warn the driver.*3

    • If the ECM detects a malfunction, this light blinks to warn the driver.*4
    ECM

    • Controls the cruise control system 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).
    Throttle Body*5 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.
    Clutch Switch Assembly*6 Detects the depressing of the clutch pedal and transmits a signal to the ECM.

    • *1: Models with diesel engine

    • *2: Models with automatic transmission

    • *3: Models for Europe

    • *4: Except models for Europe

    • *5: Models with gasoline engine

    • *6: Models with manual transmission

  2. FUNCTION


    1. The cruise control system has the following functions:

      Function Outline
      Set Control When the ON-OFF button is turned on and the cruise control main switch is pushed to 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 approx. 40 km/h (25 mph) and approx. 200 km/h (125 mph).
      Coast Control Gasoline Engine When the cruise control main switch is kept pushed 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 main switch is released. From then on, the ECM controls the vehicle speed at that speed constantly.
      Diesel Engine When the cruise control main switch is kept pushed to the SET/- direction while the cruise control system is running, the ECM decreases the fuel injection volume by regulating the 4 injectors via the EDU. As the vehicle continues to decelerate, the ECM stores the vehicle speed at the time the cruise control 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 approx. 5 km/h (3 mph), the set speed can be lowered by approx. 1.6 km/h (1 mph) each time by operating the cruise control main switch in the SET/- direction quickly within approx. 0.6 seconds. However, if the difference between the actual vehicle speed and the set vehicle speed is greater than approx. 5 km/h (3 mph), the set vehicle speed will change to the speed at which the vehicle was traveling at when the switch was released.
      Accelerator Control Gasoline Engine When the cruise control main 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 stores the vehicle speed when the cruise control main switch is released. From then on, the ECM controls the vehicle speed at that speed constantly.
      Diesel Engine When the cruise control main switch is kept pushed to the RES/+ direction while the cruise control system is running, the ECM increases the fuel injection volume by regulating the 4 injector assemblies via the EDU. As the vehicle continues to accelerate, the ECM stores the vehicle speed at the time 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 approx. 5 km/h (3 mph), the set speed can be increased by approx. 1.6 km/h (1 mph) each time by operating the cruise control main switch in the RES/+ direction quickly within approx. 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 approx. 40 km/h (25 mph). The cruise control system cannot be set below that speed. If the vehicle speed drops below that speed while the cruise control system is running, the cruise control system is canceled automatically. However the set speed is kept in memory.
      Resume Control After the cruise control system is canceled by a switch other than the ON-OFF button, 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 above the low speed limit (approx. 40 km/h [25 mph]).
      Shift Down Control*1 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.
      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 assembly on signal (depress the brake pedal)

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

      • D position circuit in park/neutral position switch assembly off signal*1

      • Signal to move the shift lever from D or 4 to any position except D or 4*3

      • Signal to move the shift lever from D or 3 to any position except D or 3*4

      • CANCEL switch on signal

      • ON-OFF button off signal
      Automatic Cancel Control

      When any of the following conditions occurs while the cruise control system is running, the set speed in the memory is cleared to cancel the cruise control system.

      Furthermore, the cruise control indicator light blinks or illuminates in yellow until the ON-OFF button is turned off, and the operation of the cruise control system 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 any of the following conditions occurs while the cruise control system is running, the set speed in the memory is cleared to cancel the cruise control system.

      Furthermore, the cruise control indicator light blinks or illuminates in yellow until the ON-OFF button is turned off, and the operation of the cruise control system 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 any of the following conditions occurs, the set speed in the memory is cleared to cancel the cruise control system.

      Furthermore, the cruise control indicator light turns off at that moment, and control is prohibited until the ON-OFF button is turned off and then turned on again.


      • The ETCS-i has a malfunction.*5

      • The ECD system has a malfunction.*6

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


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

      • The vehicle speed drops more than approx. 16 km/h (10 mph) below the set speed. The set speed in the memory is cleared.
      Other Cancellation Items*7 While the vehicle is being driven while the cruise control system is running, cruise control will be canceled if the VSC is activated. The set speed in the memory is maintained.

      • *1: Models with automatic transmission

      • *2: Models with manual transmission

      • *3: Models with 5-speed automatic transmission

      • *4: Models with 4-speed automatic transmission

      • *5: Models with gasoline engine

      • *6: Models with diesel engine

      • *7: Models with VSC

  3. CONSTRUCTION


    1. Cruise Control Main Switch


      1. The cruise control main switch consists of an ON-OFF button and 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.

        A01EZF8E01
        Text in Illustration
        *1 RES/+ *2 CANCEL
        *3 SET/- *4 ON-OFF Button

    2. Combination Meter Assembly

      A01EZHWE01
      Text in Illustration
      *1 Cruise Control Indicator Light - -

      1. The combination meter assembly illuminates the cruise control indicator light in accordance with each respective condition.

        Condition A01EZQL
        ON-OFF Button On Illuminates
        Set Control Illuminates
        Malfunction Occurred Blinks

  4. DIAGNOSIS


    1. If a malfunction occurs in the cruise control system, the ECM cancels the cruise control system. The ECM blinks the cruise control 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 corresponding Repair Manual for this model.