CRUISE CONTROL SYSTEM

FUNCTION OF MAIN COMPONENTS

1. Constant Speed Control Mode

   Component		Function
   Cruise Control Switch	Main Switch	Turns on/off the power to the constant speed control mode.
   	CANCEL Switch	A cancel signal can be output to the ECM through the operation of this switch.
   	RES/+ Switch	The acceleration function and resumption of a preset speed can be performed by operating this switch. A signal is output to the ECM when this switch is operated.
   	SET/- Switch	The deceleration function and set control function can be performed by operating this switch. A signal is output to the ECM when this switch is operated.
   Speed Sensor		Detects the vehicle speed and transmits a signal via the skid control ECU to the combination meter assembly.
   Throttle Body	Throttle Control Motor	Adjusts the throttle valve operating angle in accordance with signals from the ECM.
   	Throttle Position Sensor	Transmits the throttle valve position information to the ECM.
   Stop Light Switch Assembly		Detects the depressing of the brake pedal and transmits a signal to the ECM.
   Clutch (Brake) Pedal Stroke Sensor Assembly*1		Detects the depressing of the clutch pedal and transmits a signal via the electric parking brake ECU to the ECM.
   Park/Neutral Position Switch*2		Detects the shift position and transmits a signal to ECM.
   Combination Meter Assembly	Cruise Main Indicator Light	Illuminates when the switch on the cruise control switch has been pressed to turn the constant speed control mode on. If the ECM detects a malfunction, this light turns off to warn the driver.
   	Cruise SET Indicator Light	Illuminates when the SET/- switch on the cruise control switch has been pressed to turn the constant speed control mode set.
   ECM		Controls the constant speed control mode in accordance with signals from the switches and sensors. If the ECM detects a malfunction in the cruise control system, it will store Diagnostic Trouble Code (DTC).

   
   

   • *1: Models with manual transaxle

   • *2: Models with CVT

2. Speed Limiter Control Mode

   Component		Function
   Speed Limiter Main Switch		Turns on/off the power to the speed limiter control mode.
   Cruise Control Main Switch	CANCEL Switch	A cancel signal can be output to the ECM through the operation of this switch.
   	RES/+ Switch	The acceleration function and the speed limiter control can be started by operating this switch. A signal is output to the ECM when this switch is operated.
   	SET/- Switch	The deceleration function and vehicle speed setting resume signals are output to the ECM due to operation of this switch.
   Speed Sensor		Detects the vehicle speed and transmits a signal via the skid control ECU to the combination meter assembly.
   Throttle Body	Throttle Control Motor	Adjusts the throttle valve to the limiter position in accordance with signals from the ECM.
   	Throttle Position Sensor	Transmits the throttle valve position information to the ECM.
   Accelerator Pedal Assembly - Position Sensor		Detects whether the accelerator pedal is in the kick down mode and transmits signals to the ECM.
   Clutch (Brake) Pedal Stroke Sensor Assembly		Detects the depressing of the clutch pedal and transmits a signal via the electric parking brake ECU to the ECM.
   Combination Meter Assembly	Speed Limiter Main Indicator Light	Illuminates when the speed limiter main switch has been pressed to turn the speed limiter control mode on. If the ECM detects a malfunction, this light turns off to warn the driver.
   	Multi-information Display	Shows the state of the speed limiter control mode.
   ECM		Controls the speed limiter control mode in accordance with signals from the switches and sensors. If the ECM detects a malfunction in the cruise control system, it will store Diagnostic Trouble Code (DTC).

FUNCTION

1. The cruise control system has the following function:

   Mode	Function	Outline
   Constant Speed Control	Set Control	When the main switch is turned on and the cruise control switch is pressed to the SET/- direction and released, the ECM stores the vehicle speed in the memory and continues to control the vehicle at that speed. The set speed is between 40 km/h (25 mph) and 200 km/h (125 mph).
   	Coast Control	When the cruise control switch is kept pushed to the SET/- direction while running in the constant speed control mode, the throttle control motor is energized in the throttle closing direction, and the vehicle keeps decelerating. The ECM stores the vehicle speed when the cruise control switch is released. From then on, the ECM controls the vehicle speed at that speed constantly.
   	Tap-down Control	When the difference between the actual vehicle speed and the set speed is less than 5 km/h (3 mph), the set speed can be lowered approx. 1.6 km/h (1 mph) each time by operating the cruise control switch in the SET/- direction quickly within approx. 0.6 seconds.
   	Accelerator Control	When the cruise control switch is kept pushed to the RES/+ direction while running in the constant speed control mode, the throttle control motor is energized in the throttle opening direction. The vehicle keeps accelerating and the ECM stores the vehicle speed when the cruise control switch is released. From then on, the ECM controls the vehicle speed at that speed constantly.
   	Tap-up Control	When the difference between the actual vehicle speed and the set speed is less than 5 km/h (3 mph), the set speed can be increased approx. 1.6 km/h (1 mph) each time by operating the cruise control switch in the RES/+ direction quickly within approx. 0.6 seconds.
   	Low Speed Limit Control	The low speed limit is the lowest speed that the constant speed control mode can be set to and is set at approx. 40 km/h (25 mph). The constant speed control mode cannot be set below that speed. If the vehicle speed drops below that speed while running in the constant speed control mode, the constant speed control mode is cancelled automatically.
   	Resume Control	After the constant speed control mode is cancelled by a switch other than the main switch, the mode can be resumed and controlled at the set speed by operating the cruise control switch in the RES/+ direction when the vehicle speed returns above the low speed limit (approx. 40 km/h [25 mph]).
   	Pulley Ratio Control*1	When the vehicle is cruising uphill, the pulley ratio control may be performed by the CVT.
   Constant Speed Control	Manual Cancel Control	If any of the following signals is sent to the ECM while the vehicle is running in the constant speed control mode, the constant speed control mode is cancelled accordingly. Stop light switch assembly on signal (Depress the brake pedal) Clutch Pedal Stroke Sensor off signal (Depress the clutch pedal)*2 Signal to move the shift lever from D or M to N*1 Signal to select the M1, M2 and M3 ranges*1 CANCEL switch on signal Main switch off signal
   	Automatic Cancel Control	When any of the following conditions occurs during constant speed control mode, the set speed in the memory is cleared to cancel the constant speed control mode. Furthermore, the cruise main indicator light turns off, and a warning message displays on the multi-information display until the ON/OFF button is turned off, and the operation of the constant speed control mode is disabled until the ON/OFF button is turned on again. The stop light switch assembly has an open or short circuit. The vehicle speed signal is abnormal.
   		When any of the following conditions occurs during constant speed control mode, the set speed in the memory is cleared to cancel the cruise control system. Furthermore, the operation of the constant speed control mode is disabled until the ON/OFF button is turned on again. The ETCS-i has a malfunction.
   		When any of the following conditions occurs during constant speed control mode, the set speed in the memory is cleared to cancel the constant speed control mode. Furthermore, the cruise main indicator light turns off, and a warning message displays on the multi-information display until the ON/OFF button is turned off, and the operation of the constant speed control mode is disabled until the ignition switch (engine switch*3) is turned off. The stop light switch input signal is abnormal. The cancel circuit has a malfunction.
   		When the following condition occurs during constant speed control mode, the constant speed control mode is canceled. The constant speed control mode can be resumed at the set speed by operating the cruise control main switch assembly in the -SET or +RES direction providing that the vehicle speed is above the lower speed limit (approx. 40 km/h [25 mph]). The vehicle speed falls below the low speed limit (approx. 40 km/h [25 mph]). The set speed in the memory is maintained.
   		When the following condition occurs during constant speed control mode, the constant speed control mode is canceled. The constant speed control mode can be set by operating the cruise control main switch assembly in the -SET direction providing that the vehicle speed is above the lower speed limit (approx. 40 km/h [25 mph]). The vehicle speed drops more than 16 km/h (10 mph) below the set speed. The set speed in the memory is cleared.
   	Other Cancellation Items	While the vehicle is being driven under constant speed control mode, cruise control will be canceled if the VSC is activated. The set speed in the memory is maintained.
   Speed Limiter Control	Set Control	When the driver turns on the speed limiter main switch, the speed limiter main indicator light will illuminate in the combination meter assembly. In this state, when the cruise control switch is pressed in the SET/- direction, the system will memorize the vehicle speed that existed prior to the operation of the cruise control switch as a limit speed, and display the limit speed on the combination meter assembly. (If the cruise control switch is pressed in the SET/- direction while the vehicle is being driven at 30 km/h [20 mph] or less, or while the vehicle is stopped, the system will memorize the limit speed as being approx. 30 km/h [20 mph]).
   	Constant Speed Control	When the speed limiter control mode is on, the ECM will compare the actual vehicle speed with the limit speed. If the actual vehicle speed is greater than the limit speed, the ECM will control the throttle control motor in the closing direction. Thus, the system reduces the actual vehicle speed to the limit speed.
   	Coast Control	If the driver continues to press the cruise control switch in the SET/- direction, the system will reduce the limit speed in 5 km/h (5 mph) increments. The instant the driver releases the cruise control switch that speed will be rendered as the set speed.
   	Tap-down Control	If the driver presses the cruise control switch momentarily (approx. 0.6 seconds) in the SET/- direction, the system will reduce the limit speed by 1 km/h (1 mph) with each pressing of the switch.
   	Accelerator Control	If the driver continues to press the cruise control switch in the RES/+ direction, the system will increase the limit speed in 5 km/h (5 mph) increments. The instant the driver releases the cruise control switch that speed will be rendered as the limit speed.
   	Tap-up Control	If the driver presses the cruise control switch momentarily (approx. 0.6 seconds) in the RES/+ direction, the system will increase the limit speed by 1 km/h (1 mph) with each pressing of the switch.
   	Override Control	While driving the vehicle with the speed limiter control mode on, if the driver fully depresses the accelerator pedal, the ECM will detect that the accelerator pedal position sensor is in the kick down mode. Then, the ECM will recognize this to be the driver's acceleration requirement, and allow the vehicle to accelerate higher than the limit speed. After the acceleration, when the vehicle speed gets below the limit speed, this function will resume effecting limit speed control to the vehicle speed.
   	Cancel Control	While the vehicle is being driven with the speed limiter control mode on, if any one of the following signals is input into the ECM, the system will cancel the speed limiter control mode: CANCEL switch on signal (The driver has pressed the cruise control switch in the CANCEL direction.) Speed limiter main switch off signal (Deletes the limit speed.) Main switch on signal (Transfers to the constant speed control mode, turns off the speed limiter main indicator light, and deletes the limit speed.)
   	Resume Control	After turning the CANCEL switch on to turn the speed limiter control mode off, if the driver pushes the cruise control switch in the RES/+ direction, the system will limit the vehicle speed at the limit speed that existed at the time of cancellation.

   
   

   • *1: Models with CVT

   • *2: Models with manual transaxle

   • *3: Models with entry and start system

CONSTRUCTION

DIAGNOSIS

1. If a malfunction occurs in the cruise control system, the ECM cancels the cruise control system. The ECM turns off the cruise main indicator light or the speed limiter main indicator light to inform the driver of a malfunction. Furthermore, the ECM displays a warning message on the multi-information display. At this time, the ECM memorizes the malfunction in the form of a 5-digit Diagnostic Trouble Code (DTC). For details of the DTC, refer to the Repair Manual.