Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Celica 1988-1989.1993-1994.2000 Approved Toyota Celica 1989 computer control system

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                             COMPUTER CONTROL SYSTEM

                                      1988 Toyota Celica




         1988 Computerized Engine Controls
         TOYOTA COMPUTER CONTROL SYSTEM

         Celica

    DESCRIPTION
         The Toyota Computer Control System (TCCS) is a computerized
emission, ignition and fuel control system. The TCCS controls
Electronic Fuel Injection (EFI), engine operation and lowers exhaust
emissions while maintaining good fuel economy and driveability.
         The Electronic Control Unit (ECU) controls the TCCS. The ECU
contains data used for maintaining ignition timing under all operating
conditions. Input from various sensors allows the ECU to deliver spark
at precise timing. The ECU controls engine related systems to adjust
engine operation.
         The TCCS is primarily an emission control system, designed to
maintain proper air/fuel ratio at all operating conditions.

    OPERATION
         The TCCS consists of the following subsystems: Electronic
Fuel Injection (EFI) system, data sensors, Electronic Control Unit
(ECU), Electronic Spark Advance (ESA) system, Idle Speed Control (ISC)
system, EGR Control, Electronic Controlled Transmission (ECT),
diagnostic system and catalytic converter.

    ELECTRONIC FUEL INJECTION (EFI)
         All models are equipped with a Bosch AFC fuel injection
system. An electric fuel pump provides fuel to the fuel pressure
regulator. Pressure regulator maintains constant fuel pressure to the
injectors.
         The ECU controls the injection duration in accordance with
engine conditions to provide efficient engine operation. For more
information, see BOSCH AFC FUEL INJECTION article in the FUEL SYSTEMS
section.

    DATA SENSORS
NOTE:   The following data sensors are not necessarily used on
        every model. Note engine application. See TOYOTA ENGINE
        CODE IDENTIFICATION chart and appropriate computer control
        system schematic. See Figs. 6 through 8.

         A/C Switch
         Switch sends a signal to the ECU during A/C operation. ECU
uses this signal for controlling idle speed during A/C operation.

         Airflow Sensor
         Airflow sensor, mounted within the airflow meter, measures
airflow rate through the airflow meter. Signal is sent to ECU for
controlling fuel injection duration and spark advance system.

         Air Temperature Sensor
         Sensor is mounted in the airflow meter. Sensor measures
incoming air temperature. Signal is sent to ECU for controlling fuel
injection duration.
         Cold Start Injector Time Switch
         Switch determines coolant temperature and sends signal to
ECU on some models for cold start injector control.

         Coolant Temperature Sensor
         Coolant temperature sensor sends signal to ECU in relation
to coolant temperature. ECU uses sensor signal for controlling fuel
injection duration, spark advance system, idle speed control system
and EGR system.

                 Coolant Temperature Switch
                 Switch monitors coolant temperature and sends signal to ECU.

                 EGR Gas Temperature Sensor
                 Sensor determines EGR gas temperature and sends signal to
ECU.

         Engine Speed
         Engine speed signal information is received from the ignition
coil. The ECU uses these signals for fuel injection duration control
and spark advance system operation.

                 Knock Sensor
                 Sensor monitors ignition knock conditions and sends signal
to ECU.

         Neutral/Start Switch
         Switch is installed on A/T models to inform ECU of gear
selection. Information is used by the ECU to allow starter operation
and control engine idle.

         Oxygen (O2) Sensor
         Oxygen sensor is installed in the exhaust system and monitors
oxygen content of exhaust gases. Signal is sent to the ECU and is used
for determining fuel injection duration.

         Sub-Oxygen Sensor (Calif. Only)
         Sensor is used in conjunction with O2 sensor. Sensor monitors
oxygen content of exhaust gases and sends signal to the ECU.

         Throttle Position Sensor (TPS)
         Throttle Position Sensor (TPS) is mounted on throttle body.
Sensor determines changes in throttle valve positions and send signals
to the ECU. Signals are used for controlling fuel injection duration
and idle speed control system.

                 Turbo Pressure Sensor
                 Sensor monitors turbo pressure and sends signal to ECU.

         Vehicle Speed Sensor (VSS)
         Sensor is used to monitor vehicle speed. Vehicle speed
information is used by the ECU for cruise control and electronic
control of automatic transmission.

                 4WD Switch
                 Switch indicates 4WD operation and sends signal to ECU.

TOYOTA ENGINE CODE IDENTIFICATION
 

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