Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Celica 1988-1989.1993-1994.2000 Approved Toyota Celica 1993 THEORY_O

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                                 E - THEORY/OPERATION

                                      1993 Toyota Celica




         1993 ENGINE PERFORMANCE
         Toyota Theory & Operation

         Celica

    INTRODUCTION
          This article covers basic description and operation of engine
performance-related systems and components. Read this article before
diagnosing vehicles or systems with which you are not completely
familiar.

    AIR INDUCTION SYSTEM

    INTAKE AIR CONTROL VALVE SYSTEM
NOTE:    Intake air control valve system may also be referred to as
         Acoustic Control Induction System (ACIS).

    VARIABLE INDUCTION SYSTEM
         Turbo
         Each intake manifold cylinder runner is divided into 2 parts.
An intake air control valve is installed in one passage on each
cylinder runner. Opening and closing of intake air control valve
provides best possible airflow to prevent low-speed performance loss
and improved fuel economy.
         On Engine Control Module (ECM) uses input RPM signal from
distributor pick-up coil, throttle position signal and coolant
temperature signal for determining intake air control valve operation.

NOTE:    The T-VIS Vacuum Switching Valve (VSV) may also be referred
         to as variable induction system VSV.

         ECM controls ground circuit on T-VIS VSV, which provides
vacuum to a vacuum chamber for intake air control valve operation.

    TURBOCHARGERS
         Turbo
         All systems are equipped with Charge Air Cooler (CAC) to cool
turbocharger intake air, and a wastegate system to control maximum
boost pressure. Cooling of turbocharger intake air increases air
density, resulting in increased engine output.
         Maximum boost pressure is controlled by Engine Control Module
(ECM) and wastegate actuator. Turbocharging pressure sensor delivers
an input signal to ECM, indicating boost pressure. The ECM controls a
turbocharging pressure Vacuum Switching Valve (VSV) which operates
wastegate actuator for controlling boost pressure.

    COMPUTERIZED ENGINE CONTROLS

    TOYOTA COMPUTER CONTROL SYSTEM (TCCS)
         The TCCS is a computerized emission, ignition and fuel
injection control system. The TCCS lowers exhaust emissions while
maintaining good fuel economy and driveability. System consists of
various sensors, switches and control units. See Figs. 1-4.
         An Engine Control Module (ECM) controls the TCCS based on
input signals received from various input devices. The ECM contains
preprogrammed data to maintain optimum engine performance under all
operating conditions.




Fig. 1: Locating TCCS Components (1.6L - 4A-FE)
Courtesy of Toyota Motor Sales, U.S.A., Inc.




Fig. 2: Locating TCCS Components (2.0L Turbo - 3S-GTE)
Courtesy of Toyota Motor Sales, U.S.A., Inc.




Fig. 3: Locating TCCS Components (2.2L - 5S-FE)
Courtesy of Toyota Motor Sales, U.S.A., Inc.
Fig. 4: Locating TCCS Components (All Models)
Courtesy of Toyota Motor Sales, U.S.A., Inc.

        ENGINE CONTROL MODULE
         The Engine Control Module (ECM) microprocessor receives input
signals from various sensors, switches, and ignition and starting
system components. The ECM uses this information for controlling
various functions. See OUTPUT SIGNALS under COMPUTERIZED ENGINE
CONTROLS. The ECM has constant battery voltage at BATT terminal. The
EFI main relay provides battery voltage to +B and +B1 terminals of ECM
when ignition is turned on.
         The ECM contains a fail-safe function, used in case of sensor
or switch failure. Fail-safe function uses preprogrammed values to
provide a limp-in mode for minimal driveability. If a failure exists,
ECM will inform the driver by turning on Malfunction Indicator Light
(MIL) on the instrument panel.

NOTE:            The MIL light may also be referred to as the CHECK ENGINE
                 light.

         The ECM is equipped with a self-diagnostic function.
Diagnostic trouble codes may be set by the malfunction of various
engine sensors, switches or circuits, and stored in the ECM memory.
When diagnostic trouble code is stored, Malfunction Indicator Light
(MIL) on instrument panel will come on.

ECM LOCATION TABLE
 

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