CRUISE CONTROL SYSTEM SYSTEM DESCRIPTION


  1. CRUISE CONTROL SYSTEM (for 1GR-FE, 2TR-FE)

    This system is controlled by the ECM and actuated by the throttle with motor body. The ECM controls the following functions: ON-OFF, -SET, +RES, CANCEL, vehicle speed operation, throttle motor output control and shift down control*.

    *: for Automatic Transmission


    • The ECM compares the driving vehicle speed from the vehicle speed sensor with the stored vehicle speed set through the cruise control main switch. The ECM controls the throttle motor of the throttle with motor body to open the valve when the driving speed is less than the stored speed.

    • The ECM receives signals, such as ON-OFF, -SET, +RES and CANCEL, from the cruise control main switch and executes the corresponding function.

    • The ECM illuminates the CRUISE main indicator light in the combination meter assembly when it receives the cruise control main switch ON signal.

    • A01XKGTE01
      Text in Illustration
      *1 Cruise Control Indicator Light
      *2 Cruise Control SET Indicator Light

      The ECM illuminates the SET indicator light in the combination meter assembly when the cruise control system is operated by pushing the cruise control main switch to -SET.

    • The ECM cancels cruise control when the brake pedal is depressed and the ECM receives the stop light switch signal.

    • for Automatic Transmission:

      The ECM cancels cruise control when the shift lever is moved from D to N or when 3rd, 2nd or 1st range is selected with the shift lever in S.

    • for Manual Transmission:

      The ECM cancels cruise control when the clutch pedal is depressed and the ECM receives the clutch switch signal.

  2. CRUISE CONTROL SYSTEM (for 1KD-FTV, 1GD-FTV)

    This system controls the vehicle speed by using the ECM to change the fuel injection quantity. The ECM controls the following functions: ON-OFF, -SET, +RES, CANCEL, vehicle speed operation and fuel injection quantity control and shift down control*.

    *: for Automatic Transmission


    • The ECM compares the driving vehicle speed from the vehicle speed sensor with the stored vehicle speed set through the cruise control main switch. The ECM increases the fuel injection quantity when the driving speed is less than the stored speed.

    • The ECM receives signals such as ON-OFF, -SET, +RES and CANCEL from the cruise control main switch and executes the corresponding function.

    • The ECM illuminates the CRUISE main indicator light on the combination meter assembly when it receives the cruise control main switch ON signal.

    • A01XKGTE01
      Text in Illustration
      *1 Cruise Control Indicator Light
      *2 Cruise Control SET Indicator Light

      The ECM illuminates the SET indicator light on the combination meter assembly when the cruise control system is operation by pushed the cruise control main switch to -SET.

    • The ECM cancels cruise control when the brake pedal is depressed and the ECM receives the stop light switch signal.

    • for Automatic Transmission:

      The ECM cancels cruise control when the shift lever is moved from D to N, or 3rd, 2nd or 1st range is selected with the shift lever in S.

    • for Manual Transmission:

      The ECM cancels cruise control when the clutch pedal is depressed and the ECM receives the clutch switch signal.

  3. LIMIT CONTROL


    1. Low speed limit

      The lower limit of the speed setting range is set at approximately 40 km/h (25 mph). The cruise control system cannot be set when the driving vehicle speed is below the low speed limit. The cruise control operation will be automatically canceled but the stored vehicle speed will be retained when the vehicle speed decreases below the low speed limit of 40 km/h (25 mph) while cruise control is in operation.

    2. High speed limit

      The upper limit of the speed setting range is set at approximately 200 km/h (125 mph). The cruise control system cannot be set when the driving vehicle speed is over the high speed limit. Also, +RES cannot be used to increase speed beyond the high speed limit.

  4. OPERATION OF CRUISE CONTROL

    The cruise control main switch is used to operate 7 functions: SET, COAST, TAP-DOWN, RES (RESUME), ACCELERATION, TAP-UP and CANCEL. The SET, TAP-DOWN and COAST functions and the RES (RESUME), TAP-UP and ACCELERATION functions are operated with the same switch. The cruise control main switch is an automatic return type switch which turns on only while holding it in each direction and turns off after releasing it.


    1. SET CONTROL

      The vehicle speed is stored and constant speed control is initiated when pushing the switch to -SET while driving with the cruise control main switch on (the CRUISE main indicator light and SET indicator light is on) and with the vehicle speed within the set speed range (between the low and high speed limits).

    2. COAST CONTROL (for 1GR-FE, 2TR-FE)

      When the cruise control main switch is pushed to -SET and held in that position while the cruise control system is operating, the ECM sends a throttle valve opening angle 0° demand signal to the throttle with motor body. Then, the vehicle speed is stored and maintained when the cruise control main switch is released.

    3. COAST CONTROL (for 1KD-FTV, 1GD-FTV)

      When the cruise control main switch is pushed to -SET and held in that position while the cruise control system is operating, the ECM sends a fuel injection quantity signal to the injector driver. Then, the vehicle speed is stored and maintained when the cruise control main switch is released.

    4. TAP-DOWN CONTROL

      When tapping down the cruise control main switch to -SET (for approximately 0.6 seconds) while the cruise control system is in operation, the stored vehicle speed decreases each time by approximately 1.6 km/h (1.0 mph). However, when the difference between the driving and stored vehicle speeds is more than approximately 5 km/h (3 mph), the stored vehicle speed is set to the actual vehicle speed at the moment the cruise control main switch is released from -SET and constant speed control is initiated.

    5. ACCELERATION CONTROL (for 1GR-FE, 2TR-FE)

      The throttle motor of the throttle with motor body is instructed by the ECM to open the throttle valve when the cruise control main switch is pushed to +RES and held while the cruise control system is in operation. When the cruise control main switch is released from +RES, the vehicle speed is stored and the vehicle is controlled in order to maintain a constant speed.

    6. ACCELERATION CONTROL (for 1KD-FTV, 1GD-FTV)

      While the cruise control system is in operation, if the cruise control main switch is pushed to +RES, the injector driver increases the fuel injection quantity. When the cruise control main switch is released from +RES, the vehicle speed is stored and the vehicle is controlled in order to maintain a constant speed.

    7. TAP-UP CONTROL

      When tapping up the cruise control main switch to +RES (for approximately 0.6 seconds) while the cruise control system is in operation, the stored vehicle speed increases each time by approximately 1.6 km/h (1.0 mph). However, when the difference between the driving and the stored vehicle speed is more than approximately 5 km/h (3 mph), the stored vehicle speed will not be changed.

    8. RES (RESUME) CONTROL

      If cruise control operation is canceled with the stop light switch, CANCEL switch, etc., and if the driving speed is within the set speed range, pushing the cruise control main switch to +RES restores the vehicle speed memorized at the time of cancellation, and initiates constant speed control.

    9. SHIFT DOWN CONTROL (for Automatic Transmission)


      • Overdrive may be canceled automatically when using cruise control while driving on inclined roads, etc.

      • for 1GR-FE, 2TR-FE:

        After overdrive is canceled, if the system determines that the road is no longer inclined based on the throttle value opening amount overdrive will be restored.

      • for 1KD-FTV, 1GD-FTV:

        After overdrive is canceled, if the system determines that the road is no longer inclined based on the fuel injection volume, overdrive is restored.

      • If overdrive is canceled during an ACCEL or RESUME operation, overdrive will be restored after the ACCEL or RESUME operation is completed.

    10. MANUAL CANCEL CONTROL

      Performing any of the following cancels cruise control while the system is operating (the stored vehicle speed in the ECM is maintained).


      • Depressing the brake pedal

      • Pulling the cruise control main switch to CANCEL

      • Driving the vehicle while the vehicle stability control system is operating

      • Turning the cruise control main switch off (the stored vehicle speed in the ECM is not maintained)

      • When the ECM detects a cruise control cancel signal from four wheel control ECU

      • for Automatic Transmission:

        Moving the shift lever from D to N, or selecting 3rd, 2nd or 1st range with the shift lever in S

      • for Manual Transmission:

        Depressing the clutch pedal

      • Driving while a cancellation request is received from the transfer system

      • Both VSC and TRC are turned off.

        Tech Tips

        Cruise control is not canceled when VSC and TRC are turned off (for 1KD-FTV, 1GR-FE [except Europe, Australia] and 2TR-FE [except Russia])

  5. AUTO CANCEL


    • Both VSC and TRC are turned off.

    • The TRC is operated for a certain amount of time.

      Tech Tips

      Cruise control is not canceled when VSC and TRC are turned off (for 1KD-FTV, 1GR-FE [except Europe, Australia] and 2TR-FE [except Russia])

    • This system has an automatic cancellation function (fail-safe) Click here.