Cruise Control System System Description

Engine Hybrid System. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
Cruise Control. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

  1. CRUISE CONTROL SYSTEM

  1. LIMIT CONTROL

  1. OPERATION OF CRUISE CONTROL

  1. AUTO CANCEL (FAIL-SAFE)

Cruise Control System -- System Description



CRUISE CONTROL SYSTEM
This system is controlled by the ECM, and is actuated by the fuel injector. The ECM controls the following functions: ON-OFF, -SET, +RES, CANCEL, vehicle speed operation and injector output control.
  1. The ECM compares the driving vehicle speed from the vehicle speed sensor with the stored vehicle speed set through the cruise control main switch. When the actual vehicle speed exceeds the stored vehicle speed, the ECM decreases the fuel injection quantity. When the actual vehicle speed is less than the stored vehicle speed, the ECM increases the fuel injection quantity.
  2. The ECM receives signals such as ON-OFF, -SET, +RES, and CANCEL from the cruise control main switch and executes the corresponding function.
  3. The ECM illuminates the cruise control indicator light on the combination meter when it receives the cruise control main switch on signal.
  4. The ECM cancels the cruise control system when the brake pedal is depressed and the ECM receives the stop light switch signal.
  5. The ECM cancels cruise control when the shift lever is moved from D or 3 to a position other than D or 3, and the ECM receives the park/neutral position switch signal*1.
  6. The ECM cancels cruise control when the shift lever is moved from D or 3 to a position other than D or 4, and the ECM receives the park/neutral position switch signal*2.
  1. *1: for A340F Automatic Transmission
  2. *2: for A750F Automatic Transmission

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 approximately 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.

    HINT:
    Due to engine limitations, a speed of 200 km/h (125 mph) is not possible.

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

  2. COAST CONTROL
    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. When the cruise control main switch is released from -SET, the vehicle speed is stored and constant speed control is maintained.

  3. 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.

  4. ACCELERATION CONTROL
    While the cruise control system is in operation, if the cruise control main switch is pressed to +RES, the injector driver increases the fuel injector quantity. When the cruise control main switch is released from +RES, the vehicle speed is stored and the vehicle is controlled at a constant speed.

  5. 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.

  6. 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.

  7. 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).

    1. Depressing the brake pedal
    2. Moving the shift lever to any position except D or 3*1
    3. Moving the shift lever to any position except D or 4*2
    4. Pulling the cruise control main switch to CANCEL
    5. Turning the cruise control main switch off (the stored vehicle speed in the ECM is not maintained)
    1. *1: for A340F Automatic Transmission
    2. *2: for A750F Automatic Transmission

AUTO CANCEL (FAIL-SAFE)
This system has an automatic cancellation function (fail-safe) (HILUX_TGN26 RM000000ST1077X.html).