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Home >> Toyota Truck >> 1998 >> T100 Regular Cab Pickup 2WD L4-2693cc 2.7L DOHC MFI >> Repair and Diagnosis >> Cruise Control >> Diagrams >> Diagram Information and Instructions >> System Outline

System Outline

The current from the STOP fuse flows to the TERMINAL L of the cruise control actuator with ECU and to the TERMINAL 2 of the stop light SW.

Turning the ignition SW ON, the current flows through GAUGE fuse to the TERMINAL 8 of the cruise control indicator light. The current flowing through ENGINE fuse flows to TERMINAL +B of cruise control actuator with ECU.

When turning the ignition SW and cruise control main SW ON, the signal will be input from the TERMINAL 7 of cruise control SW to the TERMINAL CMSof cruise control actuator with ECU. With this, cruise control actuator with ECU will operate and the current loaded ON the TERMINAL +B of the cruise control actuator with ECU flows through TERMINAL GND of cruise control actuator with ECU to the GROUND and the cruise control system will become ready to operate. Simultaneously, the current flowing through the GAUGE fuse flows through the TERMINAL 8 of cruise control indicator light to the TERMINAL 6to TERMINAL PI of cruise control actuator with ECU to TERMINAL GND to GROUND, and cruise control indicator light comes ON and indicate that the cruise control is ready to be operated.

Cruise control actuator with ECU will input the signals from the speed sensor and each switch and process then according to the program memorized advance and output the control signal to the magnet clutch and motor of the actuator in the cruise control actuator with ECU and engine control module.

1. SET CONTROL
When the running vehicle speed is within the set rate (About 40 kph, 25 mph - 200 kph, 124 mph), turning the cruise control main SW ONand press the set SW The signal will be input to the TERMINAL CCS of the cruise control actuator with ECU and the ECU will memorize the vehicle speed as the set vehicle speed at the time of releasing hands from set SW.

2. VEHICLE SPEED CONTROL
ECU during cruise control compares this memorized vehicle speed with the running vehicle speed input from the speed sensor to the TERMINAL SPD of the cruise control actuator with ECU, and in order to hold the set vehicle speed, it controls the actuator inside the cruise control actuator with ECU.

Comparing the memorized vehicle speed and the running vehicle speed, in the case that the running vehicle speed is higher than the memorized vehicle speed, turn the throttle valve to close.

Turning the actuator motor, in the case that the running vehicle speed is lower than the memorized vehicle speed, turn the throttle valve to open and output the signal to turn the actuator motor.

3. COAST CONTROL
During cruise control driving and while the coast SW is ON, return the throttle cable to the direction where the cruise control actuator closes the throttle valve and reduce the speed and perform the normal speed drying by memorizing the vehicle speed when accel SW is OFF.

4. ACCELERATOR CONTROL
During cruise control driving and while the accel SW is ON, pull the throttle cable to the direction where the cruise control actuator opens the throttle valve and accelerate and perform normal speed driving by memorizing the vehicle speed when the accel SW is OFF.

5. RESUME CONTROL
After canceling with the cancel SW during the normal speed driving, if the vehicle speed is greater than the low speed limit (40 kph, less than 25 mph), by turning the resume SW ON, return it to the set vehicle speed before canceling.

6. MANUAL CANCEL CONTROL
If operating the following during cruise control driving the motor safety magnetic clutch of the actuator will turn OFF and the motor will turn to the direction to close the throttle valve and the cruise control will be canceled.

* Move the shift lever except to "D" position. (Park/Neutral position SW is OFF) (A/T) 'The signal is not input to the TERMINAL D of the cruise control actuator with ECU."

* Press the clutch pedal. (Cruise control clutch SW OFF) (M/T) "The signal is not input to the TERMINAL D of the cruise control actuator with ECU."

* Press the brake pedal. (Stop light SW is ON) "The signal is input to the TERMINAL STP- of the cruise control actuator with ECU."

* Press cancel SW. (Cancel SW is ON) "The signal is input to the TERMINAL CCS of the cruise control actuator with ECU."

7. AUTO CANCEL AND CUTTING OFF THE POWER OF THE ACTUATOR
A) During cruise control driving, in the case that the vehicle has become the following condition, delete the memorized vehicle speed and cancel the control. At the same time, until turning the main SW ON next time, the cruise control indicator light is flashing and will inhibit committing the main SW until turning the ignition SW ON again.

* When the motor inside the cruise control actuator with ECU is not operating.

* When the driving circuit of the motor inside the cruise control actuator with ECU is short or open.

B) During cruise control driving, in the case that the vehicle has become the following condition, delete the memorized vehicle speed and cancel the control. At the same time, until turning the main SW ON next time, the cruise control indicator light is flashing and will inhibit the control until turning the main SW ON.

* When the magnetic clutch system (Safety magnetic clutch) is short.

* When the magnetic clutch systems (Safety magnetic clutch) has a wire break, (Including the wire break of STOP fuse)

* When the vehicle speed signal will not be input.

* When each signal inside the cruise control SW has grounding short.

C) During cruise control driving, in case that the vehicle comes into the following condition, delete the memorized vehicle speed and cancel the control. Reset is possible.

* When the running speed has become less than the lowest limit (Approx. 40 kph, 25 mph) of the possible range of the speed setting.

8. AUTOMATIC TRANSMISSION CONTROL FUNCTION
* During cruise control driving and when the running speed has become the overdrive cut vehicle speed or less (Memorized vehicle speed 4 kph, 2.5 mph) ON a climbing lane and the likes, overdrive will be canceled promptly. This function works to increase the driving ability of the vehicle and make the drop of the vehicle speed small.

* After canceling the overdrive, in case that driving speed has become the overdrive returning speed (Memorized vehicle speed 2 kph, 1.2 mph) or more and also judged that the climbing was over, return it to the overdrive condition after the overdrive return timer has been through.
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