Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Celica 1988-1989.1993-1994.2000 Approved Toyota Celica 1994 cruise control system
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CRUISE CONTROL SYSTEM
1994 Toyota Celica
1994 ACCESSORIES & EQUIPMENT
Toyota Motor Sales, U.S.A., Inc. - Cruise Control Systems
Celica
DESCRIPTION
Cruise control system consists of Cruise Control Electronic
Control Unit (CC ECU), actuator, control cable, speed sensor, parking
brake switch, main and cruise control switches, stoplight switch,
park/neutral switch (A/T), clutch switch (M/T) and related wiring. See
Fig. 1.
System allows vehicle to cruise at a desired speed greater
than 25 MPH. Speed control will cancel when brake pedal or clutch
pedal (M/T) is depressed, CANCEL switch is activated or automatic
transmission shift lever is moved to "N" position (A/T). If vehicle
speed slows to less than 25 MPH or drops 10 MPH less than preset
speed, speed control will also cancel.
OPERATION
Pressing cruise ON-OFF (main) switch to ON position,
activates cruise control system. CRUISE indicator light in instrument
cluster illuminates to indicate activation of system. To set speed,
increase vehicle speed to desired speed (must be over 25 MPH). Pull
cruise control switch downward to SET/COAST position and release
switch. Vehicle speed will now be maintained. To increase speed,
depress accelerator pedal enough to exceed set speed. When accelerator
pedal is released, speed will return to speed previously set.
To cancel set speed, pull cruise control switch to CANCEL
position, depress brake pedal, depress clutch pedal (M/T) or place
shift lever in "N" position (A/T). If vehicle speed slows to less than
25 MPH, set speed will automatically cancel. If vehicle speed drops 10
MPH less than preset speed, set speed will also automatically cancel.
Pushing cruise control switch upward to RES/ACC position
allows vehicle to return to set speed before cancellation. Pushing
cruise control switch upward to RES/ACC position and keeping it there
gradually increases vehicle speed. Pulling cruise control switch
downward to SET/COAST position and keeping it there gradually
decreases vehicle speed.
Fig. 1: Locating Cruise Control Components
Courtesy of Toyota Motor Sales, U.S.A., Inc.
ACTUATOR
Actuator consists of a motor, safety magnetic clutch, control
arm and position sensor. When actuator receives a signal from CC ECU,
it engages safety magnetic clutch and activates motor. Motor causes
control arm to move, opening or closing engine throttle valve.
When motor rotates forward, control arm also rotates via
safety magnetic clutch, gears and drive shaft. Control arm pulls a
cable connected to engine throttle valve and opens the valve
accordingly. When motor rotates in a reverse direction, control arm
also rotates in a reverse direction and engine throttle valve closes.
CRUISE CONTROL SWITCH
ON-OFF (Main) Switch
Cruise ON-OFF switch is power switch for cruise control
system. When ignition is turned off, cruise ON-OFF switch is also
turned off. Switch remains off even when ignition is turned on again.
SET/COAST Position
With cruise ON-OFF switch on, and vehicle speed greater than
25 MPH, pull cruise control switch downward to SET/COAST position and
release switch. CC ECU will store and constantly control vehicle
speed.
While in cruise control mode, if cruise control switch is
pulled downward and held in SET/COAST position, actuator will be
energized. Engine throttle valve will close, and vehicle will
decelerate until switch is released. From then on, CC ECU will store
and constantly control new vehicle speed.
RES/ACC Position
If cruise control system is canceled by any of various
cancellation methods, the previously set speed can be resumed by
pushing cruise control switch upward to RES/ACC position and then
releasing switch. Set speed, however, cannot be resumed if vehicle
speed drops to less than 25 MPH, as CC ECU memory will be cleared.
While in cruise control mode, if cruise control switch is
pushed upward and held in RES/ACC position, actuator motor will be
energized. Engine throttle valve will open, and vehicle will
accelerate until switch is released. From then on, CC ECU stores new
vehicle speed and controls that speed constantly.
CANCEL Switch
When CANCEL switch is pulled on, a cancellation signal is
sent to CC ECU, causing cruise control system to cancel.
CRUISE CONTROL ELECTRONIC CONTROL UNIT (CC ECU)
CC ECU constantly monitors and compares set speed with actual
vehicle speed from input sensors. When vehicle speed is different from
set speed, CC ECU activates actuator motor to change engine throttle
valve, changing vehicle speed.
CC ECU includes a self-diagnostic function. If cruise
control system is canceled by any condition other than driver
operation, CC ECU assumes a malfunction has occurred and may set a
corresponding trouble code. See SELF-DIAGNOSTIC SYSTEM.
SPEED SENSOR
Speed sensor is mounted on transmission. Speed sensor rotor
shaft is driven by a gear on speedometer output shaft. For each shaft
rotation, speed sensor sends a 4-pulse signal which is sent to CC ECU.
CC ECU calculates vehicle speed from this pulse frequency.
SELF-DIAGNOSTIC SYSTEM
When vehicle is in cruise control mode, system will cancel
due to a malfunction in actuator, speed sensor or cruise control
switch circuits. When cruise control functions are canceled, CRUISE
indicator light will flash for .5 seconds with a 1.5 second pause
separating each flash, indicating 2-digit trouble code(s) are stored
in CC ECU memory. See CC ECU TROUBLE CODE DEFINITION table under SELF-
DIAGNOSTICS. Two digit trouble code(s) will be stored in CC ECU memory
until ignition is turned off. See SELF-DIAGNOSTICS.
Not all malfunctions set a trouble code. When a malfunction
is present that does not set a trouble code, CRUISE indicator light
will flash on and off every .25 seconds indicating normal system
operation. See TROUBLE SHOOTING BY SYMPTOM under TROUBLE SHOOTING.
NOTE: Intermittent failures may cause CRUISE indicator light to
flicker or illuminate. Light will go out after fault goes
away. Fault may or may not be present at time of testing;
however, a corresponding trouble code may be stored in CC
ECU memory. See SELF-DIAGNOSTICS.
SELF-DIAGNOSTICS
CAUTION: Vehicles that are equipped with Supplemental Restraint
System (SRS). SRS wiring harness is routed close to
instrument cluster, steering wheel and related components.
All SRS wiring harnesses and connectors are Yellow. DO NOT
use electrical test equipment on these circuits. Before
working on cruise control components, disable air bag
system. See the AIR BAG RESTRAINT SYSTEM article in
the ACCESSORIES & EQUIPMENT section.
WARNING: Wait at least 90 seconds after disabling SRS. Back-up power
circuit, capacitor, maintains system voltage for about 90
seconds after battery is disconnected. Servicing cruise
control system before 90 seconds may cause accidental air
bag deployment and possible personal injury.
READING TROUBLE CODES
Trouble codes are displayed as flashes of CRUISE indicator
light. All trouble codes are 2-digit numbers. After a 4 second pause,
code(s) will begin to flash. A .5 second flash indicates one digit
with a 1.5 second pause separating each digit of a code. A 2.5 second
pause separates each trouble code. See Fig. 2. Trouble codes with a 2,
3 or 4 as the first digit, a .5 second flash separates each tenth
indicated.
CC ECU outputs trouble codes from lowest to highest. These
codes indicate current faults in system and should be serviced in
order of appearance. Pay careful attention to length of pauses in
order to read codes correctly. See Fig. 2.
Fig. 2: Reading Trouble Codes
Courtesy of Toyota Motor Sales, U.S.A., Inc.
RETRIEVING TROUBLE CODES
1) Codes from CC ECU self-diagnostic system are retrieved
through self-test diagnostic Data Link Connector (DLC). Test drive
vehicle to allow trouble codes to set in CC ECU memory. If CRUISE
indicator light begins to flash for .5 seconds with a 1.5 second pause
separating each flash while driving, or cruise control will not set or
operate, check for trouble codes. Go to next step.
2) Stop vehicle and leave ignition switch in ON position. If
ignition switch is turned to OFF position, any stored trouble codes
will be erased from CC ECU memory. Connect jumper wire between DLC
self-diagnostic terminals. See Fig. 3.
3) If any code is present, perform test(s) in order given.
See CC ECU TROUBLE CODE DEFINITION table. See TROUBLE CODE/CIRCUIT
TEST CHARTS. If CRUISE indicator light begins flashing on and off
every .25 seconds (normal) and no trouble codes are present, but a
malfunction still exists, go to TROUBLE SHOOTING BY SYMPTOM under
TROUBLE SHOOTING.
4) If CRUISE indicator light does not flash and no trouble
codes are present, but cruise control system malfunction still exists,
go to TROUBLE SHOOTING BY SYMPTOM under TROUBLE SHOOTING.
Fig. 3: Identifying DLC Terminals
Courtesy of Toyota Motor Sales, U.S.A., Inc.
CC ECU TROUBLE CODE DEFINITION TABLE
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