The engine-A/T-ECU calculates the cruise control system operation status when
the cruise control section of the cruise control system inside the engine-A/T-ECU receives
the input signals of the cruise control switch, vehicle speed sensor and cancel system (stop
lamp switch and inhibitor switch.) To the engine control section it sends the target accelerator
pedal opening angle value for cruise control system, to the A/T control section it issues
a command to shift control, and to the gauge it issues an ON/OFF command for the cruise
control indicator lamp. In the engine control section, the target throttle valve opening angle value is calculated
from the target accelerator pedal opening angle value for auto-cruise control system and the
actual accelerator angle value, and the vehicle speed is controlled by applying the throttle
actuator control motor. BLOCK DIAGRAM
SYSTEM OUTLINE <4M4>
The engine-ECU calculates the amount of fuel consumption at the cruise control section
based on signals which are input from the cruise control switch, vehicle speed signal and cancel
system (stop lamp switch, clutch switch <M/T>
and inhibitor switch <A/T>.)
And to the cruise control section it issues a shift control command for the A/T-ECU <A/T>. To the gauge it issues an ON/OFF command for the cruise control indicator lamp. In the engine control section, the amount of fuel consumption is calculated based on the
target engine torque signal from the cruise control section and the actual accelerator pedal
opening angle signal, and the vehicle speed is controlled by controlling the fuel injection
system. BLOCK DIAGRAM
SYSTEM FUNCTIONS
SET FUNCTION
1.While driving in the vehicle speed range of approximately 40 to 165 km/h,
press the "COAST/SET" switch. 2.The cruise control system stores the vehicle speed when the "COAST/SET" switch
is released, and then performs a constant speed driving at the stored vehicle speed. 3.When the "COAST/SET" switch is operated while driving at the vehicle speed
of high speed limit (approximately 165 km/h) or faster, the constant speed driving
is not performed.
DECELERATION FUNCTION
1.When the "COAST/SET" switch is pressed and held for approximately 0.5 second
or longer during the constant speed driving, the vehicle is decelerated by using engine braking while
the switch is pressed. 2.After that the "COAST/SET" switch is released, the vehicle speed of that
time is newly stored, and then the constant speed driving is performed at that speed. 3.In addition, when the "COAST/SET" switch is pressed for less than approximately
0.5 second, the vehicle speed is decreased by approximately 1.6 km/h from the constant
speed driving speed. The decelerated speed is newly stored, and then the constant speed driving
is performed at that speed. 4.When the "COAST/SET" switch is pressed and held, and the vehicle speed is decelerated
to low speed limit (approximately 40 km/h) or less, the set function and coast function are
released, and the constant speed driving is cancelled. <6G7> 5.When the "COAST/SET" switch is pressed and held, and the vehicle speed is decelerated
to low speed limit (approximately 40 km/h) or less, the vehicle speed of low speed
limit (approximately 40 km/h) becomes a newly stored vehicle speed. <4M4>
RESUME FUNCTION
1.During the constant speed driving, press the "CANCEL" switch, or depress the brake pedal
to cancel the constant speed driving. 2.Afterward, when the "ACC/RES" switch is pressed while driving at a vehicle
speed of low speed limit (approximately 40 km/h) or more, a constant speed driving
is performed at the vehicle speed stored when the constant speed driving was cancelled.
ACCELERATION FUNCTION
1.During the constant speed driving, when the "ACC/RES" switch is pressed and
held for approximately 0.5 seconds or longer, the vehicle is accelerated with the specified acceleration
while the switch is pressed. 2.After that the "ACC/RES" switch is released, the vehicle speed of that time
is newly stored, and then the constant speed driving is performed at that speed. 3.In addition when the "ACC/RES" switch is pressed for less than approximately
0.5 seconds, the vehicle speed is increased by approximately 1.6 km/h from that of
the constant speed driving. The accelerated vehicle speed is newly stored, and then the constant
speed driving is performed at that speed. 4.It is possible to accelerate the vehicle speed to high speed limit (approximately
165 km/h) or more by pressing and holding the "ACC/RES" switch. However, after
the "ACC/RES" switch is released, the vehicle speed of high speed limit (approximately
165 km/h) becomes a newly stored vehicle speed, and then the constant speed driving
is performed at that speed. <6G7>
CANCEL FUNCTION
When any one of the following conditions is met, the constant speed driving will be cancelled.
The cruise control system is stopped by the pressing
the "ON/OFF" switch.
The "CANCEL" switch is pressed.
The brake pedal is depressed.
The clutch pedal is depressed. <M/T>
The select lever is shifted to the "N" position. <A/T>
The vehicle speed becomes low speed limit (approximately 40 km/h) or less.
The vehicle speed is decreased by 15 km/h or more from the starting speed
of the constant speed driving.
Also, the constant speed driving may be deactivated as follows.
The engine speed rises and approaches the tachometer’s red zone.
FAIL-SAFE FUNCTION
When one of the following conditions is met, the cruise control system function will be
suspended until the system returns to normal condition. Also, when one of the following conditions
is met, a constant speed driving is cancelled immediately.
An abnormality occurs in the cruise control switch.
An abnormality occurs in the stop lamp signal.
When one of the following conditions is met, unless the vehicle is stopped to turn the
ignition switch to the "LOCK" (OFF) position, the cruise control system function will be suspended
even if the system returns to the normal state. Also, one of the following conditions is met,
a constant speed driving is cancelled immediately.
Engine-ECU <4M4>
abnormality or engine-A/T-ECU <6G7>
abnormality
Accelerator pedal position sensor abnormality
A/T-ECU abnormality. <4M41-A/T>
An abnormality occurs in the vehicle speed signal.
Throttle position sensor abnormality. <6G7>
DIAGNOSIS FUNCTION
With the cruise control indicator lamp, the diagnosis
code inspection is available. <6G7>
To ease the system inspection, the service data output inspection is available by M.U.T.-III. <6G7>
To ease the system inspection, the diagnosis code inspection and service data output
inspection is available by M.U.T.-III. <4M4>
note
For the diagnosis items, service data output items and inspection method, refer to the
Workshop Manual.
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