Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2004 WRX STi 08. MECHANISM AND FUNCTION 62. CRUISE CONTROL SYSTEM 01. Cruise Control
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W1860BE.book Page 2 Tuesday, January 28, 2003 11:01 PM
CRUISE CONTROL
CRUISE CONTROL SYSTEM
1. Cruise Control
A: OPERATION
The cruise control system automatically controls the vehicle speed. It allows the vehicle to run at
a constant speed without need for the driver to keep the accelerator pedal depressed.
When the driver has activated the system and made a desired speed setting, the cruise control
module compares the actual vehicle speed detected by the speed sensor (MT) or transmission con-
trol module (AT) with the preset speed in the memory, then generates a signal according to the dif-
ference between the two speeds.
This signal is transmitted to the actuator located in the engine compartment.
The actuator operates the throttle cam as necessary to keep the preset vehicle speed.
CC-2
W1860BE.book Page 3 Tuesday, January 28, 2003 11:01 PM
CRUISE CONTROL
CRUISE CONTROL SYSTEM
B: LOCATION OF COMPONENTS
(1)
(2)
(8)
(3)
(4)
(5)
(6)
(7)
CC-00194
(1) Actuator (5) Clutch switch (MT)
(2) Inhibitor switch (AT) (6) Stop and brake switch
(3) Command switch (cruise control lever) (7) Control module
(4) Main switch (8) Cruise indicator light and cruise set indicator light
CC-3
W1860BE.book Page 4 Tuesday, January 28, 2003 11:01 PM
CRUISE CONTROL
CRUISE CONTROL SYSTEM
C: CONTROL AND OPERATION
Constant speed When actual vehicle speed is higher than the "set" speed, the motor in the actuator operates to move the throttle
control valve in the closing direction by the amount corresponding to the difference between the two speeds.When ac-
tual driving speed is lower than "set" speed, the motor operates to move the throttle valve in the opening enabling
direction according to the difference in speed.
Speed setting When SET/COAST switch is pressed with main switch ON while the vehicle is being driven at a speed greater
control than 40 km/h (25 MPH), current flows to the actuator. This causes the clutch in the actuator to engage, enabling
the motor to operate. The motor moves the throttle valve to the position corresponding to the accelerator pedal
position. The vehicle is driven at the set speed.
Deceleration When SET/COAST switch is turned ON while the vehicle is cruising at a constant speed, the motor in the actu-
control ator rotates to move the throttle valve in the closing direction. This causes the vehicle to decelerate a certain
amount. When the switch is turned OFF, the vehicle speed is stored in memory and the vehicle maintains that
speed thereafter.
Acceleration When RESUME/ACCEL switch is turned ON while the vehicle is cruising at a constant speed, the motor in the
control actuator rotates to move the throttle valve in the opening direction. This causes the vehicle to accelerate by a
certain amount. When the switch is turned OFF, the vehicle speed is stored in memory and the vehicle maintains
that speed thereafter.
Resume control When RESUME/ACCEL switch is turned ON after the cruise control is temporarily cancelled, vehicle speed re-
turns to that speed which was stored in memory just before the cruise control is cancelled. This occurs only when
the vehicle is running at a speed greater than 32 km/h (20 MPH). In the following cases, however, the set vehicle
speed is completely cleared. Therefore, no resume control is performed.
(1) Ignition switch is turned OFF
(2) Main switch is turned OFF
Manual cancel When any of the following signals is entered into the cruise control module, the clutch is disengaged and the
control cruise control is deactivated.
(1) Stop light switch ON signal (brake pedal depressed) (2) Brake switch OFF signal (brake pedal depressed)
(3) Clutch switch OFF signal (clutch pedal depressed -- MT) (4) Inhibitor switch ON signal (selector lever set
to N -- AT) (5) CANCEL switch ON signal (command switch (cruise control lever) pulled) (6) Ignition switch
OFF signal (7) Main switch OFF signal
Low speed limit When the vehicle speed drops below 32 km/h (20 MPH), the cruise control is automatically cancelled. Cruise
control control at any speed lower than 40 km/h (25 MPH) cannot be effected.
Motor control When the vehicle speed becomes 10 km/h (6 MPH) or more higher than the memorized speed while vehicle is
running utilizing the cruise control (in a downgrade, for example), the actuator's clutch is turned OFF so that the
vehicle decelerates. When the vehicle's speed decreases by 8 km/h (5 MPH) or more from the memorized
speed, the clutch is turned ON again so that the cruise control resumes.
CC-4
W1860BE.book Page 5 Tuesday, January 28, 2003 11:01 PM
CRUISE CONTROL
CRUISE CONTROL SYSTEM
MEMO
CC-5
W1860BE.book Page 6 Tuesday, January 28, 2003 11:01 PM
CRUISE CONTROL
CRUISE CONTROL SYSTEM
D: SCHEMATIC
(12)
(13)
(1)
(2)
(14)
(3) (4) (5)
MT
(6)
AT (15)
(17)
AT MT
(16)
(7)
(8) (18) AT
(19)
(20)
(21)
(22)
(10)
(23)
(9) (24)
(11)
CC-00192
CC-6
W1860BE.book Page 7 Tuesday, January 28, 2003 11:01 PM
CRUISE CONTROL
CRUISE CONTROL SYSTEM
(1) Battery (13) Engine throttle valve
(2) Ignition switch (14) Cruise control cable
(3) Main switch (15) Actuator
(4) Cruise indicator light (16) TCM (AT)
(5) Cruise set indicator light (17) Vehicle speed sensor (MT)
(6) Clutch switch (MT) (18) Vehicle speed signal
(7) Clutch pedal (MT) (19) TCM (AT)
(8) Stop and brake switch (20) Cruise control module
(9) Brake pedal (21) RESUME/ACCEL switch
(10) Selector lever (22) CANCEL switch
(11) Inhibitor switch (P and N) (23) SET/COAST switch
(12) To accelerator pedal (24) Command switch (cruise control lever)
E: ACTUATOR
In response to a signal from the cruise control module, the clutch in the actuator is turned ON. This
causes the stepping motor to operate, pulling the throttle cam for speed control.
(1)
(A) (B)
(2)
(3)
(4) (5)
CC-00159
(1) Throttle cam (A) Release
(2) Clutch (B) Pulling direction
(3) Pulley
(4) Gear
(5) Stepping motor
CC-7
W1860BE.book Page 8 Tuesday, January 28, 2003 11:01 PM
CRUISE CONTROL
CRUISE CONTROL SYSTEM
F: MAIN SWITCH
The main switch is the main power supply switch of the cruise control module. The main switch
contains a night illumination light.
When the main switch is pressed, an indicator light in the combination meter illuminates.
When the ignition switch is placed in the OFF position with the main switch ON, the main switch
is also turned OFF. Even if the ignition switch is turned ON again, the main switch will stay in the
OFF state.
3 5 1 6 4 2
ON
2 1 OFF
(1) 6 5 4 3
(2) (3) (4) (5)
CC-00193
(1) Illumination (5) Illumination power
(2) Ignition switch (6) Illumination control
(3) Control module
CC-8
W1860BE.book Page 9 Tuesday, January 28, 2003 11:01 PM
CRUISE CONTROL
CRUISE CONTROL SYSTEM
G: COMMAND SWITCH (CRUISE CONTROL LEVER)
When the vehicle is driven with the cruise control activated, the command switch controls its op-
eration. It inputs SET/COAST signal, ACCEL/RESUME signal or CANCEL signal to the cruise con-
trol module.
When the cruise control is set, the SET indicator light in the combination meter illuminates.
(2) (4)
(3) (5)
+B (6)
(1)
(8) (7)
CC-00161
(1) Command switch (5) SET/COAST
(2) Horn relay (6) CANCEL
(3) Horn (7) RESUME/ACCEL
(4) Horn switch (8) Control module
The command switch is located on the right side of the steering wheel, so the driver can operate
it without releasing hands from the steering wheel.
The command switch is a self-returning lever type.
1. RESUME/ACCEL AND SET/COAST SWITCH
Each switch contact is held closed as long as the lever is kept pressed in the relevant direction and
resulting current is applied as a signal to the control module.
2. CANCEL SWITCH
All the switch contacts are closed as long as the lever is pulled toward the CANCEL position (toward
the driver). This causes the RESUME/ACCEL and SET/COAST ON signals to be sent to the control
module simultaneously.
CC-9
W1860BE.book Page 10 Tuesday, January 28, 2003 11:01 PM
CRUISE CONTROL
CRUISE CONTROL SYSTEM
H: CANCEL SIGNALS
The cancel signal deactivates the cruise control function. Operating any of the following switches
results in generation of the cancel signal. On receiving the signal, the cruise control module cancels
the cruise control function.
Stop light switch
Brake switch
Clutch switch (MT models)
Inhibitor switch (AT models)
Main switch
Command switch (CANCEL position)
I: VEHICLE SPEED SENSOR
The vehicle speed sensor is installed on the transmission, and sends signal to the cruise control
module which uses it in controlling the cruise control function (MT models).
J: ENGINE THROTTLE
The throttle body is equipped with two throttle cams. One is used during acceleration and the oth-
er during cruising in order to open or close the throttle valve.
These cams operate independently of each other. In other words, when one cam operates, the
other may not.
(3)
(1)
(2)
CC-00162
(1) Accelerator cable
(2) Cruise control cable
(3) Throttle cam
CC-10
W1860BE.book Page 11 Tuesday, January 28, 2003 11:01 PM
CRUISE CONTROL
CRUISE CONTROL SYSTEM
K: CONTROL MODULE
Based on signals from the related switches and sensors, the cruise control module controls all
the following control functions:
Constant speed control; speed setting control; deceleration control; acceleration control; resume
control; manual cancel control; low speed limit control; stepping motor control; cruise control
The control module (A) is located inside of the front pillar lower portion (driver side).
(A) CC-00163
CC-11
W1860BE.book Page 12 Tuesday, January 28, 2003 11:01 PM
CRUISE CONTROL
CRUISE CONTROL SYSTEM
L: FAIL-SAFE FUNCTION
The cruise control system has a fail-safe function that cancels the cruise control operation when any
of the following conditions occurs.
1. CONFLICT BETWEEN CRUISE CONTROL SWITCHES AND CANCELLATION SIGNAL
GENERATING SWITCHES
The cruise control system is deactivated if any of the cruise control switches (SET/COAST, RE-
SUME/ACCEL, and CANCEL switches) is turned ON while any of the cancellation signal generating
switches (brake, stop light, clutch, and inhibitor switches) is being operated. The system is re-acti-
vated when the cruise control switch is turned OFF and then turn ON again after the cancellation
signal generating switch has been returned to its released position.
When the main switch is turned ON while any of the cruise control switches is in the ON position,
the cruise control system is deactivated. The system deactivating function is retained until the main
switch is turned OFF.
2. ABNORMALITIES IN ELECTRIC CIRCUITS
The cruise control system is deactivated and the set speed is also canceled if any of the following
abnormalities occurs in the system's electric circuits.
The system deactivation function is retained until the ignition switch or the main switch is turned
OFF.
The stepping motor terminal is grounded or disconnected; or the stepping motor drive circuit is
broken due to a short-circuit.
The stepping motor clutch drive circuit is shorted.
Vehicle speed variation in a 350 ms period exceeds ◦ Jabse Service Manual Search 2026 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo