Cruise Control: Description and Operation

SYSTEM OUTLINE

Current is applied at all times through the STOP fuse to TERMINAL 2 of the stop light SW. With the ignition SW turned to on, the current flows through GAUGE fuse to TERMINAL (B) 10 of the cruise control indicator light. At the same time, the current through EFI 1 fuse flows to TERMINAL 5 of the EFI MAIN relay to TERMINAL 3 to TERMINAL (A) 16 of the engine control module and TERMINAL 1 of the mass air flow meter.

When the ignition SW is on and the cruise control SW is turned on, a signal is input from TERMINAL 2 of the cruise control SW to TERMINAL (A) 19 of the engine control module.

As a result, the engine control module functions and the cruise control system is ready for operation.

At the same time, the cruise control indicator light to light up, indicating that the cruise control is ready for operation.

1. SET OPERATION
When the cruise control SW is turned on and the set SW is pushed with the vehicle speed within the set limit (Approx. 40 km/h, 25 mph to 200 km/h, 124 mph), a signal is input to TERMINAL (A) 19 of the engine control module and the vehicle speed at the time set SW is released is memorized in the engine control module as the set speed.

2. SET SPEED CONTROL
During cruise control driving, the engine control module compares the set speed memorized in the engine control module with the actual vehicle speed input into TERMINAL (B) 22 of the engine control module from the combination meter, and controls the engine control module to maintain the set speed.
When the actual driving speed is lower than the set speed, the current flows from TERMINAL (D) 19 of the engine control module to TERMINAL 1 of the throttle control motor to TERMINAL 2 to TERMINAL (D) 29 of the engine control module to TERMINAL (D) 8 to GROUND. As a result, the throttle control motor causes the throttle valve to open which increases the vehicle speed. When the actual driving speed is higher than the set speed, the current flows from TERMINAL (D) 29 of the engine control module to TERMINAL 2 of the throttle control motor to TERMINAL 1 to TERMINAL (D) 19 of the engine control module to TERMINAL (D) 8 to GROUND and the throttle control motor causes the throttle valve to close which decreases the vehicle speed.

3. COAST CONTROL
During the cruise control driving, while the coast SW is on, the throttle control motor closes the throttle valve and decrease the driving speed. The vehicle speed when the coast SW is turned oft is memorized and the vehicle continues at the new set speed.

4. ACCEL CONTROL
During cruise control driving, while the accel SW is turned on, the throttle control motor opens the throttle valve and increase the driving speed.
The vehicle speed when the accel SW is turned oft is memorized and the vehicle continues at the new set speed.

5. RESUME CONTROL
Unless the vehicle speed falls below the minimum speed limit (Approx. 40 km/h, 25 mph) after canceling the speed by the cancel SW, pushing the resume SW will cause the vehicle to resume the speed set before cancellation.

6. MANUAL CANCEL MECHANISM
If any of the following operations occurs during cruise control operation, the magnetic clutch of the actuator turns off and the motor rotates to close the throttle valve and the cruise control is released.
- When shifting the gear, a signal is input into TERMINAL (A) 7 of the engine control module.
- Depressing the brake pedal (Stop light SW on). "Signal is input to TERMINAL (B) 6 of the engine control module"
- Pushing the cancel SW (Cancel SW on). "Signal is input to TERMINAL (A) 19 of the engine control module"
- Pushing the cruise SW oft. "Signal is input to TERMINAL (A) 19 of the engine control module"

7. TAP-UP CONTROL FUNCTION
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 1.6 km/h (1 mph) each time by operating the RESUME/ACCEL SW quickly within 0.6 seconds.

8. TAP-DOWN CONTROL FUNCTION
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 1.6 km/h (1 mph) each time by operating the SET/COAST SW quickly within 0.6 seconds.

9. AUTO CANCEL FUNCTION
A. If any of the following operating conditions occurs during cruise control operation, the set speed is erased, cruise control is released. (Cruise control SW turns off).
When this occurs, the ignition SW must be turned off once before the main SW will turn on.
- Open circuit for TERMINAL (A) 18 of the engine control module and TERMINAL 3 of the stop light SW.
- Abnormality in the vehicle speed signal.
- Malfunction in the electronically controlled throttle parts.

B. If any of the following conditions occurs during cruise control operation, the set speed is erased and the cruise control is released.
- When the vehicle speed falls below the minimum speed limit (Approx. 40 km/h 25 mph).
- When the vehicle speed falls more than 16 km/h (10 mph) below the set speed, E.G. on an upward slope.