System Outline

The cruise control system is a constant vehicle speed controller which allows the driver to control the opening angle of the engine throttle valve with a SW, and allows the vehicle to be driven at a constant speed without depressing the accelerator pedal.

1. Set Control 

   When the - SET SW is pressed while driving with the ON-OFF SW on, the vehicle speed when the - SET SW is released will be stored, and the vehicle will be maintained at that speed.

2. Coast Control 

   When the - SET SW is held down while driving with the cruise control active, the cruise control opening angle requirement is turned to 0 and the vehicle will be slowly and gradually decelerated. The vehicle speed when the - SET SW is released will be stored, and the vehicle will be maintained at that speed.

   Furthermore, every time the - SET SW is pressed momentarily (Approx. 0.5 sec.), the stored vehicle speed will be decreased by approx. 1.5 km/h (0.9 mph).

3. Accel Control 

   When the + RES SW is held down while driving with the cruise control active, the throttle motor rotates the throttle valve to the open direction and the vehicle will be slowly and gradually accelerated. The vehicle speed when the + RES SW is released will be stored, and the vehicle will be maintained at that speed.

   Furthermore, every time the + RES SW is pressed momentarily (Approx. 0.5 sec.), the stored vehicle speed will be increased by approx. 1.5 km/h (0.9 mph).

4. Manual Cancel Mechanism 

   If any of the following signals are received while driving with the cruise control active, the current to the motor flows in the direction to close the throttle valve, and cancel the cruise control.

   1. The stop light SW is turned on (Brake pedal is depressed)
   2. The CANCEL SW of the control SW is pressed
   3. The ON-OFF SW is turned off
   4. The gear is shifted from the D position to a different position.
5. Resume Control 

   After canceling the cruise control (except when the ON-OFF SW is off) if the vehicle speed is above the minimum speed limit (Approx. 40 km/h, 25 mph), pressing the + RES SW will cause the system to resume the vehicle speed that was set before the manual cancellation.

6. Overdrive Function 

   The overdrive may be disabled on an uphill grade, when driving with the cruise control active.

   After the overdrive has been disabled, if the throttle angle sensor determines that the uphill grade has finished, the overdrive will resume after the overdrive timer has expired.

7. Auto Cancel Operation 

* If any of the following conditions are detected, the set speed will be erased and the control will be canceled.

1. Disconnection and/or short in the stop light SW
2. Malfunction in the vehicle speed signal
3. Malfunction in the electronic throttle parts
4. Malfunction in the stop light SW input circuit
5. Malfunction in the cancel circuit
6. The actual vehicle speed falls to -16 km/h or more below the set speed

* If the following condition is detected, the set speed will be retained but the control will be canceled.

1. The actual vehicle speed falls below the minimum speed limit.