Cruise Control System System Description

Cruise Control System. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Cruise Control. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

  1. CRUISE CONTROL SYSTEM

  1. LIMIT CONTROL

  1. OPERATION OF CRUISE CONTROL

  1. AUTO CANCEL (FAIL-SAFE)

Cruise Control System -- System Description



CRUISE CONTROL SYSTEM
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, - (COAST)/SET, + (ACCEL)/RES, CANCEL, vehicle speed operation, motor output control, and shift down control.
  1. The ECM compares the driving vehicle speed from the combination meter with the stored vehicle speed set through the cruise control main switch. The ECM controls the throttle valve motor of the throttle body to open the valve when the driving speed is less than the stored speed.
  2. The ECM receives signals such as ON-OFF, - (COAST)/SET, + (ACCEL)/RES, and CANCEL from the cruise control main switch and executes the corresponding function.
  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 park/neutral position switch signal (for Automatic Transaxle, 2GR-FE).
  6. 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 park/neutral position switch signal (for Automatic Transaxle, 1AZ-FE, 2AZ-FE).
  7. The ECM cancels the cruise control system when the shift lever is moved from D to N and the ECM receives the park/neutral position signal, or when the S1, S2 or S3 range is selected with the shift lever in S and the ECM receives the transmission control switch signal or transmission shift switch signal (for CVT).
  8. The ECM cancels the cruise control system when the clutch pedal is depressed and the ECM receives the clutch switch signal (for Manual Transaxle).

LIMIT CONTROL

  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, + (ACCEL)/RES cannot be used to increase speed beyond the high speed limit.


OPERATION OF CRUISE CONTROL
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 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 pushing the cruise control main switch to -/SET 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° and decelerates the vehicle when -/SET 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, the vehicle speed is stored and constant speed control is maintained.

    HINT:
    1. The throttle valve is not fully closed due to idle speed control, etc.
    2. w/ VSC, except CVT:
      The brake is also used to decelerate the vehicle.

  3. TAP-DOWN CONTROL
    When tapping down the cruise control main switch to -/SET (for approximately 0.6 seconds) while the cruise control system is in operation, 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 and the difference between the driving and the stored vehicle speed is less than 5 km/h (3 mph), the vehicle speed is stored and constant speed control 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 +/RES on the cruise control switch is pressed and held while the cruise control system is operating. When the cruise control main switch is released from +/RES, the vehicle speed is stored and constant speed is maintained.

  5. TAP-UP CONTROL
    When tapping up the cruise control main switch to +/RES (for approximately 0.6 seconds) while the cruise control system is in operation, 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 (approximately 3 mph), the stored vehicle speed will not be changed.

  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 +/RES 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. Pulling the cruise control main switch to CANCEL
    3. The shift lever is moved from D or 4 to N, 3, 2 or 1 (for Automatic Transaxle, 2GR-FE).
    4. The shift lever is moved from D or 3 to N, 2 or 1 (for Automatic Transaxle, 1AZ-FE, 2AZ-FE).
    5. The shift lever is moved from D to N, or the S1, S2 or S3 range is selected with the shift lever in S (for CVT).
    6. Depressing the clutch pedal (for Manual Transaxle).
    7. Pushing the cruise control main switch OFF (the stored vehicle speed in the ECM is not maintained)

AUTO CANCEL (FAIL-SAFE)

  1. This system has an automatic cancellation function (fail-safe) (RAV4_ACA30 RM000000ST1045X.html).