MAIN SWITCH
When the switch is pushed once the cruise control system turns ON and becomes ready to set the cruise control. When the switch is pushed again the cruise control turns OFF.
CANCEL, RESUME/ACCEL AND SET/COAST SWITCH
Each switch contact is held closed as long as the lever is kept pressed in the relevant direction (except the CANCEL switch which should be pulled), and resulting current is applied as a signal to the engine control module (ECM).
CANCEL SIGNAL
A cancel signal deactivates the cruise control function. Operating any of the following switches results in generation of a cancel signal. On receiving a signal, the engine control module (ECM) cancels the cruise control function.
- Stop light switch
- Brake switch
- Clutch switch (MT)
- Inhibitor switch (AT)
- Neutral position switch (MT)
- MAIN switch (OFF operation)
- Command switch (CANCEL position)
- Ignition switch (OFF operation)
VEHICLE SPEED SIGNAL
Vehicle speed signals are sent from the ABS control module or vehicle dynamic control (VDC) control module to the engine control module (ECM), which uses the signals in controlling the cruise control function.
ENGINE CONTROL MODULE (ECM)
- Based on signals from the related switches and sensors, the engine control module (ECM) controls all the following control functions: Constant speed control; speed setting control; deceleration control; acceleration control; resume control; manual cancel control; low speed limit control; electronic control throttle control
- The engine control module (ECM) (A) is located at the legroom of the front passenger's seat.
Scheme 4
FAIL-SAFE FUNCTION
The cruise control system has a fail-safe function that cancels the cruise control operation when any of the following conditions occurs.
CONFLICT BETWEEN CRUISE CONTROL SWITCHES AND CANCELLATION SIGNAL GENERATING SWITCHES
- The cruise control system is deactivated if any of the cruise control switches (SET/COAST, RESUME/ACCEL, and CANCEL switches) is turned ON while any of the cancellation signal generating switches (brake, stop light, clutch, neutral position and inhibitor switches) is activated. The system is re-activated when the cruise control switch is turned OFF and then turn ON again after the cancellation signal generating switch has been returned to its released position.
- When the ignition switch is turned ON while any of the command switches is in the ON position, the cruise control system is deactivated. The system deactivating function is retained until the ignition switch is turned OFF.
ABNORMALITIES IN ELECTRIC CIRCUITS
The cruise control system is deactivated and the set speed is also canceled if any of the following abnormalities occurs in the system electric circuits. The system deactivation function is retained until the ignition switch is turned OFF.
- Abnormality of the command switch is detected.
- Abnormality of the stop light switch and brake switch is detected.
- Abnormality of the inhibitor switch is detected. (AT)
- Abnormality of the neutral position switch is detected. (MT)
- Abnormality of the ignition switch is detected.
- Change in vehicle speed signal is detected.
- Abnormality in any of the engine related sensors is detected.
- Abnormality of the brake switch input circuit in the engine control module (ECM) is detected.
- The MAIN switch and command switch were already ON when the ignition switch is turned ON.
CRUISE CONTROL CANCEL FUNCTION
When any of the following conditions is met, the cruise control is cancelled.
To set the cruise control again, the vehicle speed must be returned to within the speed setting range and necessary conditions must be met.
- Abnormal engine speed acceleration is detected.
- The vehicle speed has dropped below the lower control limit during cruise control driving.
- The vehicle has been running at speed higher than the set speed for an abnormally long time during cruise controlled driving.
- The set speed became impossible to be maintained for some reason (steep upgrade, hand brake operation, abnormal engine power drop, etc.).