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System Description
 
 
SYSTEM DIAGRAM
Component partsFunction
Stop light switchStop Light SwitchStop Lamp Switch.
ASCD steering switchSteering Switch.
TCM
  • It transmits the output shaft speed signal to ECM via CAN communication.
  • It transmits the park/neutral position signal to ECM via CAN communication.
Combination meter
  • It transmits the vehicle speed signal to ECM via CAN communication.
  • It receives the ASCD status signal from ECM via CAN communication.
ECMECM.
Electric throttle control actuatorElectric Throttle Control Actuator.
 
 
BASIC ASCD SYSTEM
Refer to Owner's Manual for ASCD operating instructions.
Automatic Speed Control Device (ASCD) allows a driver to keep vehicle at predetermined constant speed without depressing accelerator pedal. Driver can set vehicle speed in advance between approximately 40 km/h (25 MPH) and 144 km/h (89 MPH).
ECM controls throttle angle of electric throttle control actuator to regulate engine speed.
The ASCD operation status is indicated by two indicators (CRUISE and SET on the information display) on the combination meter. If any malfunction occurs in ASCD system, SET indicator blinks and ASCD control is deactivated.
noteAlways drive vehicle in safe manner according to traffic conditions and obey all traffic laws.
 
 
SET OPERATION
Press MAIN switch. (CRUISE is indicated on the information display.)
When vehicle speed reaches a desired speed between approximately 40 km/h (25 MPH) and 144 km/h (89 MPH), press SET- switch or RES+ switch. (Then SET is indicated on the information display.)
noteIf press RES+ switch when there is no set speed, the set speed is set to the current speed.
 
 
ACCELERATE OPERATION
If the RES+ switch is pressed during cruise control driving, increase the vehicle speed until the switch is released or vehicle speed reaches maximum speed controlled by the system.
And then ASCD will keep the new set speed.
 
 
CANCEL OPERATION
When any of following conditions exist, cruise operation will be canceled.
  • CANCEL switch is pressed
  • More than 2 switches at ASCD steering switch are pressed at the same time (Set speed will be cleared)
  • Brake pedal is depressed
  • Selector lever is changed to N, P, R position
  • Vehicle speed decreased to 13 km/h (8 MPH) lower than the set speed
  • TCS system is operated
When the ECM detects any of the following conditions, the ECM will cancel the cruise operation and inform the driver by blinking indicators.
  • Engine coolant temperature is slightly higher than the normal operating temperature, CRUISE indicator may blink slowly.
    When the engine coolant temperature decreases to the normal operating temperature, CRUISE indicator will stop blinking and the cruise operation will be able to work by pressing SET- switch or RES+ switch.
  • Malfunction for some self-diagnoses regarding ASCD control: SET indicator will blink quickly.
If MAIN switch is turned to OFF during ASCD is activated, all of ASCD operations will be canceled and vehicle speed memory will be erased.
 
 
COAST OPERATION
When the SET- switch is pressed during cruise control driving, decrease vehicle set speed until the switch is released. And then ASCD will keep the new set speed.
 
 
RESUME OPERATION
When the RES+ switch is pressed after cancel operation other than pressing MAIN switch is performed, vehicle speed will return to last set speed. To resume vehicle set speed, vehicle condition must meet following conditions.
  • Brake pedal is released
  • Selector lever is in other than P and N positions
  • Vehicle speed is greater than 40 km/h (25 MPH) and less than 144 km/h (89 MPH)