System Description
Warning: Do not use the cruise control on slippery roads, steeply graded roads, or in heavy traffic of heavy or varying volume. Failure to follow these CAUTIONS could possibly cause you to loose control
of the vehicle and result in damage to the vehicle and personal injury.
The system is controlled by the engine control module (ECM), and is activated by the throttle position sensor and motor. The ECM controls the following functions:
| • | Vehicle speed operation |
The ECM compares the driving vehicle speed from the speed sensor with the stored vehicle speed set through the cruise control main switch. The ECM instructs the throttle valve motor of the throttle body assembly to close the valve when the driving speed
is greater than the stored speed, and instructs it to open the valve when the driving speed is less than the stored speed.
The ECM receives signals such as ON-OFF, -(COAST)/SET, +(ACCEL)/RES (RESUME), and CANCEL from the cruise control main switch and executes the command.
The ECM illuminates the instrument panel CRUISE main indicator light when it receives a cruise control main switch on signal.
The ECM cancels the cruise control system when as follows:
| • | When the brake pedal is depressed and the ECM receives a stop light switch signal |
| • | When the shift lever is moved to except D or S (5th and 4th) for 5A/T |
| • | When the shift lever is moved to except D or S (4th and 3rd) for 4A/T |
| • | When the clutch pedal is depressed and the ECM receives a clutch switch signal for M/T |
Limit Control
| • | 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 and the stored vehicle speed will be retained when the vehicle speed drops below the low speed limit 40 km/h (25 mph) while the cruise control is in operation. |
| • | 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
(RESUME) cannot be used to increase speed beyond the high speed limit. |
System Operation
The cruise control main switch operates 7 functions as follows:
The cruise control main switch is an automatic return type switch which turns On only while operating it in the direction of each arrow and turns off after releasing it.
The cruise control main switch operates the SET, -(COAST), TAP-DOWN, RES (RESUME), +(ACCEL), TAP-UP and CANCEL functions. 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 assembly is an automatic return type switch which turns on only while operating it in each arrow direction and turns off after releasing it.
| • | SET CONTROL--The vehicle speed is stored and constant speed control is maintained when pushing the cruise control main switch to -(COAST)/SET while driving with the main switch on (the CRUISE main indicator light is on), and the vehicle
speed is within the set speed range between the low and high speed limits. |
| • | -(COAST) CONTROL--When the cruise control main switch is set to -(COAST)/SET and held in that position while the cruise control system is operating, the ECM sends a "throttle valve opening angle 0°" demand signal
to the cruise control system. Then the vehicle speed, when the cruise control main switch is released, is stored and maintained. |
| • | TAP-DOWN CONTROL--When tapping down on the cruise control main switch to -(COAST)/SET (for approximately 0.6 second) 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 -(COAST)/SET and the difference between the driving and stored vehicle speed is more than 5 km/h (3.1 mph), the driving vehicle speed is stored and constant
speed control is maintained. |
| • | ACCELERATION CONTROL--The throttle valve motor of the throttle body assembly is instructed by the ECM to open the throttle valve when +(ACCEL)/RES (RESUME) on the cruise control main switch is pressed and held while the cruise control system
is in operation. When the cruise control main switch is released from +(ACCEL)/RES (RESUME), the vehicle speed is stored and the vehicle is controlled at a constant speed. |
| • | TAP-UP CONTROL--When tapping up on the cruise control main switch to RES/ACC (for approximately 0.5 second) 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 (3.1 mph), the stored vehicle speed will not be changed. |
| • | TAP-UP CONTROL--When tapping up on the cruise control main switch to +(ACCEL)/RES (RESUME) (for approximately 0.6 second) while the cruise control system is in operation, the stored vehicle speed increases each time by approximately
1.6 km/h (1 mph). However, when the difference between the driving speed and the stored vehicle speed is more than 5 km/h (3.1 mph), the stored vehicle speed will not be changed. |
| • | RESUME CONTROL--If cruise control operation was cancelled with the stop lamp switch, the CANCEL switch or the low speed limit control, and if driving speed is within the limit range, pushing the cruise control main switch to +(ACCEL)/RES (RESUME)
restores vehicle speed memorized at the time of cancellation, and maintains constant speed control. |
| • | MANUAL CANCEL CONTROL--Performing any of the following cancels the cruise control system while in operation (the stored vehicle speed in the ECM is maintained): |
| • | Depressing the brake pedal |
| • | Depressing the clutch pedal (for M/T) |
| • | The shift lever is moved to except D or S (5th and 4th) for 5A/T |
| • | The shift lever is moved to except D or S (4th and 3rd) for 4A/T |
| • | Pulling the cruise control main switch to CANCEL |
| • | Turning the cruise control main switch off (the stored vehicle speed in the ECM is not maintained) |
AUTO CANCEL (FAIL-SAFE)
If the following conditions are detected while the cruise control is in operation, the system clears the stored vehicle speed in the PCM and cancels the cruise control operation.
| • | The CRUISE main indicator light blinks. |
| - | An open or short in the stop lamp switch circuit |
| - | A problem with the vehicle speed signal |
| - | A problem with the throttle position sensor and motor |
| - | A problem with the input circuit of the stop lamp switch circuit |
| - | A problem with the cancel circuit |
| • | The CRUISE main indicator light remains On. |
| - | Vehicle speed is lower than the low speed limit, approximately 40 km/h (25 mph) while running with the cruise control On. |
| - | Vehicle speed is lower than the stored speed by approximately 16 km/h (10 mph) or more. |
