CRUISE CONTROL SYSTEM SYSTEM DESCRIPTION

CRUISE CONTROL SYSTEM

for 1GR-FE, 2TR-FE

This system is controlled by the ECM. Control is performed using the throttle position sensor and motor. The ECM controls the following functions: ON-OFF, SET, COAST, RES, ACCEL, CANCEL, vehicle speed operation and shift down control*.

The ECM compares the vehicle speed from the speed sensor with the stored vehicle speed set using the cruise control main switch. The ECM instructs the throttle valve motor of the throttle with motor body assembly to close the valve when the vehicle speed is greater than the stored speed, and instructs it to open the valve when the vehicle speed is less than the stored speed.

*: for Automatic Transmission

for 1GD-FTV, 2GD-FTV, 1KD-FTV

This system controls the vehicle speed by using the ECM to change the fuel injection quantity. The ECM controls the following functions: ON-OFF, SET, COAST, RES, ACCEL, CANCEL, vehicle speed operation and fuel injection quantity control and shift down control*.

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.

*: for Automatic Transmission

The ECM receives signals such as ON-OFF, SET, COAST, RES, ACCEL, and CANCEL from the cruise control main switch and executes the command.
The ECM illuminates the combination meter assembly cruise control indicator light when it receives the cruise control main switch on signal.
w/ Multi-information Display:

The ECM turns off the combination meter assembly cruise control indicator light and displays a warning message when a malfunction occurs during cruise control driving.
w/o Multi-information Display:

The cruise control indicator light in the combination meter assembly changes to yellow when a malfunction occurs during cruise control driving.
The ECM illuminates the combination meter assembly cruise control SET indicator light when vehicle speed control begins after the cruise control main switch is pushed to -SET while driving.

*1	Cruise Control Indicator Light
*2	Cruise Control SET Indicator Light

The ECM cancels the cruise control system when the brake pedal is depressed and the ECM receives the stop light switch signal.

for Manual Transmission:

The ECM cancels the cruise control system when the clutch pedal is depressed and the ECM receives the clutch switch assembly.
for Automatic Transmission:

The ECM cancels control of vehicle speed when the shift lever is moved from D or S to any other position.

The ECM cancels control of vehicle speed when the shift lever is used to select the 3rd, 2nd or 1st range with the shift lever in S.
The ECM cancels control of vehicle speed when the cruise control main switch is pulled to CANCEL.
The ECM cancels control of vehicle speed when the cruise control system is turned off using the cruise control main switch.

LIMIT CONTROL
1. Low speed limit
  
  The lowest possible set speed is approximately 40 km/h (25 mph). The cruise control system cannot be set when the vehicle speed is below the low speed limit. Control of vehicle speed will be automatically canceled but the stored vehicle speed will be retained when the vehicle speed drops below the low speed limit while the cruise control is controlling vehicle speed.
2. High speed limit
  
  The highest possible set speed is approximately 200 km/h (125 mph). The cruise control system cannot be set when the vehicle speed is over the high speed limit. Also, +RES cannot be used to increase the speed beyond the high speed limit.
OPERATION OF CRUISE CONTROL

The cruise control main switch is used to turn the cruise control system on and off, as well as operate 7 functions: SET, - (COAST), TAP-DOWN, RES (RESUME), + (ACCEL), TAP-UP, and CANCEL. The SET, TAP-DOWN, and - (COAST) functions, and the RES (RESUME), TAP-UP, and + (ACCEL) functions are operated with the same switch. The cruise control main switch is an automatic return type switch which turns on only while being operated in the direction of each arrow, and turns off when it is released.
1. SET CONTROL
  
  The vehicle speed is stored and speed control begins when the cruise control main switch is pushed to -SET while driving with the cruise control system on (while the cruise control indicator light is illuminated), and the vehicle speed is within the set speed range (between the low and high speed limits).
2. - (COAST) CONTROL (for 1GR-FE, 2TR-FE)
  
  When the cruise control system is controlling vehicle speed and the cruise control main switch is pushed to -SET and held in that position, the cruise control system sends a "throttle valve opening angle 0°" demand signal to the ECM. Following this, the vehicle speed is stored and maintained when the cruise control main switch is released.
  
  Tech Tips
  
  An actual throttle valve opening angle of 0° is not possible due to items such as idle speed control.
3. - (COAST) CONTROL (for 1GD-FTV, 2GD-FTV)
  
  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. Then, the vehicle speed is stored and maintained when the cruise control main switch is released.
4. - (COAST) CONTROL (for 1KD-FTV)
  
  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. Then, the vehicle speed is stored and maintained when the cruise control main switch is released.
5. TAP-DOWN CONTROL
  
  When the cruise control system is controlling vehicle speed and the cruise control main switch is tapped to the -SET side (for approximately 0.6 seconds or less), the stored vehicle speed decreases by approximately 1.6 km/h (1 mph) for each time the switch is tapped. When the cruise control main switch is tapped to -SET and the difference between the current and stored vehicle speed is more than approximately 5 km/h (3 mph), the current vehicle speed is stored and speed control is performed.
6. ACCELERATION CONTROL (for 1GR-FE, 2TR-FE)
  
  When the cruise control system is controlling vehicle speed and the cruise control main switch is pushed to +RES and held in that position, the cruise control system sends a signal to the ECM to operate the throttle valve motor of the throttle with motor body assembly to open the throttle valve. Following this, the vehicle speed is stored and maintained when the cruise control main switch is released.
7. ACCELERATION CONTROL (for 1GD-FTV, 2GD-FTV)
  
  While the cruise control system is in operation, if the cruise control main switch is pushed to +RES, the ECM increases the fuel injection quantity. When the cruise control main switch is released from +RES, the vehicle speed is stored and the vehicle is controlled in order to maintain a constant speed.
8. ACCELERATION CONTROL (for 1KD-FTV)
  
  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.
9. TAP-UP CONTROL
  
  When the cruise control system is controlling vehicle speed and the cruise control main switch is tapped to the +RES side (for approximately 0.6 seconds or less), the stored vehicle speed increases by approximately 1.6 km/h (1 mph) for each time the switch is tapped. When the cruise control main switch is tapped to +RES and the difference between the current and stored vehicle speed is more than approximately 5 km/h (3 mph), the stored vehicle speed will not be changed.
10. RESUME CONTROL
  
  If control of vehicle speed by the cruise control system was canceled due to any of the manual cancel conditions (other than turning the cruise control system off using the cruise control main switch), and if the vehicle speed is between the low and high speed limits, the stored vehicle speed from the time of cancelation will be resumed and maintained when the cruise control main switch is pushed to +RES.
11. SHIFT DOWN CONTROL (for Automatic Transmission)
  
  When the vehicle is traveling uphill using cruise control, automatic transmission control may cause the transmission to shift down. During shift down control, when the end of uphill travel is determined, the transmission will shift up after a certain period of time. When the transmission shifts down during the accelerator control or the resume control, the transmission will shift up after the accelerator control or the resume control ends.
12. CANCEL CONTROL
  - Performing any of the following cancels control of vehicle speed by the cruise control system (the stored vehicle speed in the ECM is maintained).
  - Performing any of the following cancels the cruise control system (the stored vehicle speed in the ECM is maintained).
  - Performing any of the following cancels the cruise control system (the stored vehicle speed in the ECM is not maintained).
AUTO CANCEL (FAIL-SAFE)

This system has an automatic cancellation function (fail-safe).

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