Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Celica 1988-1989.1993-1994.2000 Approved Toyota Celica 1993 CRUIS_CO
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CRUISE CONTROL SYSTEM
1993 Toyota Celica
1993 ACCESSORIES/SAFETY EQUIPMENT
Toyota Cruise Control Systems
Celica
DESCRIPTION
Cruise control system consists of Cruise Control Electronic
Control Unit (CC ECU), actuator and associated cables, speed
sensor(s), parking brake switch, cruise control switch, 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
is depressed, CANCEL switch is activated or automatic transmission
shift lever is moved to "N" position. If vehicle speed falls below 25
MPH or drops 10 MPH less than preset speed, will be canceled. If a
malfunction is detected in either actuator, speed sensor or speed
control switch circuits cruise control function, speed control will
also be canceled.
OPERATION
Pressing cruise control CRUISE ON-OFF to ON position,
activates system. CRUISE indicator light in instrument cluster comes
on to indicate activation of system. To set desired speed, press
control SET/COAST switch 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, press cruise control CANCEL switch,
depress brake pedal, depress clutch pedal or place shift lever in "N"
position. If vehicle speed falls to less than 25 MPH, set speed will
automatically cancel. If vehicle speed falls below set speed by 10
MPH, set speed will also automatically cancel.
Pressing cruise control RES/ACC switch, allows vehicle to
return to set speed before cancellation. Pressing cruise control
RES/ACC position and keeping it there gradually increases vehicle
speed. Pressing cruise control SET/COAST position and keeping it there
gradually decreases vehicle speed.
ACTUATOR (MOTOR)
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.
Safety magnetic clutch disengages motor from control arm and
shuts throttle valve when vehicle speed approaches 10 MPH or more
above set speed during cruise control operation, when motor
malfunctions or when a circuit problem occurs. Position sensor detects
rotary angle of control arm and constantly sends a signal to CC ECU.
ACTUATOR (VACUUM)
Actuator consists of a vacuum diaphragm, control cable and
vacuum control valve. When cruise control is activated, vacuum
actuator receives an input signal from CC ECU, to increase vehicle
speed. Signal from CC ECU causes vacuum control valve to close
atmospheric intake port introducing a vacuum to diaphragm. Control
cable is pulled and throttle valve is opened, increasing vehicle speed
to preselected speed. To close throttle valve, signal from CC ECU is
decreased, causing vacuum control valve to reduce vacuum and increase
atmospheric pressure. Control cable is released and throttle valve is
closed.
CRUISE CONTROL SWITCH
CRUISE ON-OFF Switch
Cruise control CRUISE ON-OFF switch is power switch for
cruise control system. When ignition is turned off, cruise control
CRUISE ON-OFF switch is also turned off. Switch remains off even when
ignition is turned on again.
SET/COAST Position
With cruise control CRUISE ON-OFF switch turned on and
vehicle speed greater than 25 MPH, press cruise control switch in
SET/COAST position and then release. CC ECU will store vehicle speed
and control that speed constantly.
While in cruise control mode, if cruise control switch is
pressed and held in SET/COAST position, actuator motor will be
energized. Engine throttle valve will close, and vehicle will
decelerate until switch is released. From then on, CC ECU will store
new vehicle speed and control that speed constantly.
RES/ACC Position
If cruise control system is canceled by any of various
cancellation methods, the previously set speed can be resumed by
moving cruise control switch to RES/ACC position and then releasing.
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
pressed 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 Position
When cruise control switch is turned to CANCEL position, a
cancellation signal is sent from cruise control switch to CC ECU.
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 fault code.
SPEED SENSOR
Speed sensors are located in combination meter and/or on
extension housing of Electronically Controlled Transmission (ECT) or
M/T. Speed sensor rotor shaft is driven by a gear on speedometer
output shaft. For each shaft rotation, speed sensor sends a 20-pulse
signal to instrument cluster. This signal is converted inside
instrument cluster to 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 either actuator, speed sensor or speed control
switch circuit. When cruise control functions are canceled, CRUISE
light will blink 5 times, 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 codes(s) will be stored in
CC ECU memory until ignition is turned off. See SELF-DIAGNOSTICS.
If a fault or symptom is present, but no trouble codes were
set, a circuit function test can be performed. Circuit function test
will display a one digit function code if circuit tested is okay. See
CRUISE CONTROL CIRCUIT FUNCTION TEST under TROUBLE SHOOTING.
NOTE: Intermittent failures may cause CRUISE indicator light to
flicker or come on. 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.
Fig. 1: Locating Cruise Control Components
Courtesy of Toyota Motor Sales, U.S.A., Inc.
SELF-DIAGNOSTICS
* PLEASE READ THIS FIRST *
CAUTION: Celica is equipped with a 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. Refer
to AIR BAG RESTRAINT SYSTEM article in ACCESSORIES/SAFETY
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. 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 Service 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 fault codes to set in CC ECU memory. If CRUISE
indicator light begins to flash 5 times 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 CC ECU CODE RETRIEVAL table. See
Fig. 3.
3) If any code is present, perform test(s) in order given.
See CC ECU FAULT CODE DEFINITION table. If no codes are present and
CRUISE indicator light begins flashing on and off every .25 seconds,
perform NORMAL code tests in order given. See CC ECU FAULT CODE
DEFINITION table. If no codes are present and CRUISE indicator light
does not flash on and off every .25 seconds, and cruise control system
malfunction still exists, perform CRUISE CONTROL CIRCUIT FUNCTION TEST
under TROUBLE SHOOTING.
CC ECU CODE RETRIEVAL TABLE
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