CRUISE CONTROL SYSTEM


  1. FUNCTION OF MAIN COMPONENTS

    Component Function
    Cruise Control Main Switch Main Switch 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.
    Speed Sensor Detects the vehicle speed and transmits a signal via the skid control ECU to the combination meter assembly.
    Throttle Body 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.
    Stop Light Switch Assembly Detects the depressing of the brake pedal and transmits a signal to the ECM.
    Park/Neutral Position Switch Assembly Detects the shift position and transmits a signal to the ECM.
    Combination Meter Assembly Cruise Main 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 blinks to warn the driver.
    Cruise SET Indicator Light Illuminates when the SET/- switch on the cruise control main switch has been pressed to set the cruise control system.
    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).
    4WD Control ECU Sends a cruise control system cancel signal to the driving support ECU if an abnormality occurs when the drive mode is switched between low and high, when the center differential lock is switched, etc.

  2. FUNCTION


    1. The cruise control system has the following functions:

      Function Outline
      Set Control When the main switch 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 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.
      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 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.
      Accelerator Control 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.
      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 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 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 main switch, 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 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 on signal (depress the brake pedal)

      • Signal to move the shift lever from D to N

      • The 1st, 2nd or 3rd range is selected in the S mode position.

      • CANCEL switch on signal

      • Main switch 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 main indicator light blinks until the main switch is turned off, and the operation of the cruise control system is disabled until the main switch is turned on again.


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

      • The vehicle speed signal is abnormal.

      • The ETCS-i has a malfunction.

      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 main indicator light blinks until the main switch is turned off, and the operation of the cruise control system is disabled until the engine switch is turned off.


      • The stop light switch input signal is abnormal.

      • The cancel circuit has a malfunction.

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

  3. 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-informationdisplay 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.