GSIC - Global Service Information Center

# CRUISE CONTROL SYSTEM > SYSTEM DESCRIPTION

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CRUISE CONTROL SYSTEM (1GR-FE)

This system is controlled by the ECM, and is activated by the throttle position sensor and motor. The ECM controls the following functions: ON-OFF, SET/COAST, RESUME/ACCEL, CANCEL, vehicle speed operation, motor output control, and overdrive control.

1. The ECM compares the vehicle speed from the speed sensor with the stored vehicle speed set through the cruise control main switch . The ECM controls the throttle valve motor of the throttle position sensor and motor to open the valve when the driving speed is less than the stored speed.
2. The ECM receives signals such as ON-OFF, SET/COAST, RESUME/ACCEL, and CANCEL from the cruise control main switch and executes them.
3. The ECM illuminates the combination meter's CRUISE main indicator light when it receives the cruise control main switch ON signal.
4. The ECM cancels the cruise control system when the brake pedal is depressed and the ECM receives the stop light switch signal.
5. The ECM cancels the cruise control system when the shift lever is moved from D or 4 to a position other than D or 4, and the ECM receives the PNP switch signal.

CRUISE CONTROL SYSTEM (1KD-FTV)

The cruise control 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, RESUME/ACCEL, CANCEL, vehicle speed operation, motor output control, and overdrive control.

1. The ECM compares the vehicle speed from the 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.
2. The ECM receives signals such as ON-OFF, SET/COAST, RESUME/ACCEL, and CANCEL from the cruise control main switch and executes them.
3. The ECM illuminates the combination meter's CRUISE main indicator light when it receives the cruise control main switch ON signal.
4. The ECM cancels the cruise control system when the brake pedal is depressed and the ECM receives the stop light switch signal.
5. The ECM cancels the cruise control system when the shift lever is moved from D or 3 to a position other than D or 3, and the ECM receives the PNP switch signal.

LIMIT CONTROL (1GR-FE)

1. Low speed limit
   The lowest possible limit of the speed setting range is set at approximately 40 km/h (25 mph). The cruise control system cannot be set when the driving vehicle speed is below the low speed limit. Cruise control operation will be automatically canceled when the vehicle speed decreases below the low speed limit 40 km/h (25 mph) while the cruise control is in operation.

2. High speed limit
   The highest possible limit of the speed setting range is set at approximately 200 km/h (125 mph). The cruise control system cannot be set when the driving vehicle speed is over the high speed limit. Also, RESUME/ACCEL cannot be used to increase speed beyond the high speed limit.

LIMIT CONTROL (1KD-FTV)

1. Low speed limit
   The lowest possible limit of the speed setting range is set at approximately 40 km/h (25 mph).The cruise control system cannot be set when the vehicle speed is below this speed. Cruise control operation will be automatically canceled and the stored vehicle speed will be erased when the vehicle speed decreases below the low speed limit approximately 40 km/h (25mph) while the cruise control system is operating.

2. High speed limit
   The highest possible limit of the speed setting range is set at approximately 200 km/h (125 mph).The cruise control system cannot be set when the vehicle speed is over the high speed limit. Also, RESUME/ACCEL cannot be used to increase speed beyond the high speed limit.

OPERATION OF CRUISE CONTROL (1GR-FE)

The cruise control main switch operates 7 functions: SET, COAST, TAP-DOWN, RESUME, ACCELERATION (ACCEL), TAP-UP, and CANCEL. The SET, TAP-DOWN and COAST functions, and the 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 pressing it in each arrow direction and turns off after releasing it.

1. SET CONTROL
   Vehicle speed is stored and constant speed control is maintained when pushing the switch to SET/COAST while driving with the cruise control main switch ON (the CRUISE main indicator light is illuminated), and the vehicle speed is within the set speed range (between the low and high speed limits).

2. COAST CONTROL
   The ECM changes the cruise control demanding throttle opening angle to 0 degrees and decelerates the vehicle when SET/COAST on the cruise control main switch is pressed and held while the cruise control system is operating. When the cruise control main switch is released from SET/COAST, the vehicle speed is stored and constant speed control is maintained.

   HINT:
     The throttle valve is not fully closed due to idle speed control, etc.

3. TAP-DOWN CONTROL
   When tapping down the cruise control main switch to SET/COAST (for approximately 0.6 seconds) while the cruise control system is operating, the stored vehicle speed decreases each time by approximately 1.6 km/h (1.0 mph). When the cruise control main switch is released from SET/COAST and the difference between the driving and stored vehicle speed is more than 5 km/h (3 mph), the vehicle speed is stored and constant speed is maintained.

4. ACCEL CONTROL
   The throttle valve motor of the throttle position sensor and motor is instructed by the ECM to open the throttle valve when RESUME/ACCEL on the cruise control main switch is pressed and held while the cruise control system is operating. When the cruise control main switch is released from RESUME/ACCEL, the vehicle speed is stored and constant speed is maintained.

5. TAP-UP CONTROL
   When tapping up the cruise control main switch to RESUME/ACCEL (for approximately 0.6 seconds) while the cruise control system is operating, the stored vehicle speed increases each time by approximately 1.6 km/h (1.0 mph). However, when the difference between the driving and the stored vehicle speed is more than 5 km/h (3 mph), the stored vehicle speed does not change.

6. RESUME CONTROL
   If the cruise control operation was canceled with the stop light switch or the CANCEL switch, and if driving speed is within the set speed range, setting the cruise control main switch to RESUME/ACCEL restores the vehicle speed memorized at the time of cancellation, and constant speed is maintained.

7. MANUAL CANCEL CONTROL
   Performing any of the following cancels the cruise control system (the stored vehicle speed in the ECM is maintained).

   1. Depressing the brake pedal
   2. Moving the shift lever to any position except D or 4
   3. Setting the cruise control main switch to CANCEL
   4. Turning the cruise control main switch OFF (the stored vehicle speed in the ECM is not maintained)

OPERATION OF CRUISE CONTROL (1KD-FTV)

The cruise control main switch operates 7 function: SET, COAST, TAP-DOWN, RESUME, ACCELERATION (ACCEL), TAP-UP, and CANCEL. The SET, TAP-DOWN and COAST functions, and the RESUME, TAP-UP and ACCEL function are operated with the same switch. The cruise control main switch is an automatic return type switch which turns on only when pressed in each arrow direction and turns off when released.

1. SET CONTROL
   Vehicle speed is stored and constant speed control is maintained when setting the switch to SET COAST while driving with the cruise control main switch ON (the CRUISE main indicator light is illuminated), and the vehicle speed is within the set speed range (between the low and high speed limits).

2. COAST CONTROL
   When the SET/COAST button on the cruise control main switch is pressed and held while the cruise control system is operating, ECM changes the required fuel injection quantity to 0 and decelerates the vehicle. When the cruise control main switch is released from SET/COAST, the vehicle speed is stored and constant speed control is maintained.

3. TAP-DOWN CONTROL
   When tapping down on the cruise control main switch to SET/COAST (for approximately 0.6 seconds) while the cruise control system is operating, the stored vehicle speed decreases each time by approximately 1.6 km/h (1.0 mph). When the cruise control main switch is released from SET/COAST and the difference between the driving and stored vehicle speed is more than 5 km/h (3 mph), the vehicle speed is stored and constant speed is maintained.

4. ACCEL CONTROL
   While the cruise control system is activated, if the main switch is set to RESUME/ACCEL, the EDU increases the fuel injection quantity. When the cruise control main switch is released from RESUME/ACCEL, the vehicle speed is stored and constant speed is maintained.

5. TAP-UP CONTROL
   When tapping up the cruise control main switch to RESUME/ACCEL (for approximately 0.6 seconds) while the cruise control system is operating, the stored vehicle speed increases each time by approximately 1.6 km/h (1.0 mph). However when the difference between the driving and the stored vehicle speed is more than 5 km/h (3 mph), the stored vehicle speed does not change.

6. RESUME CONTROL
   If the cruise control operation was canceled with the stop light switch or the CANCEL switch and if driving speed is within the set speed range, setting the cruise control main switch to RESUME/ACCEL restores the vehicle speed memorized at the time of cancellation and constant speed maintained.

7. MANUAL CANCEL CONTROL
   Performing any of the following cancels the cruise control system.

   1. Depressing the brake pedal
   2. Moving the shift lever to any position except D or 3
   3. Setting the cruise control main switch to CANCEL
   4. Turning the cruise control main switch OFF