GENERAL INFORMATION

LIST OF COMPONENT FUNCTIONS
Name		Function
ECU	Engine-A/T-ECU	The signals that are input by the sensors enable the actuators to be controlled in accordance with the driving conditions.
Sensors	Ignition switch-IG	This signal indicates the ON/OFF condition of the ignition switch. When this signal is input, the Engine-A/T-ECU supplies power to the crank angle sensor, camshaft position sensor, etc.
	Ignition switch-ST	This signal indicates that the engine is cranking. Based on this signal, the Engine-A/T-ECU controls the fuel injection, throttle valve position, and the injection timing that are suited for starting the engine.
	Air flow sensor (AFS)	This signal, which indicates the intake air flow rate (mass), is input into the Engine-A/T-ECU. Based on the signals from this sensor, the Engine-A/T-ECU effects fuel injection control.
	Barometric pressure sensor	This sensor detects the altitude of the vehicle. It enables the Engine-A/T-ECU to make fuel injection volume corrections in order to achieve an appropriate air-fuel ratio.
	Manifold absolute pressure sensor	The intake pipe pressure is detected and input the engine-A/T-ECU. The engine-A/T-ECU controls the fuel injection based on this signal. Detects the internal pressure changes of intake manifold in accordance with the exhaust gas recirculation valve opening or closing. Performs the self-diagnostics of exhaust gas recirculation systems.
	Oxygen sensor	This sensor, which contains zirconia and platinum electrodes, detects the level of oxygen concentration in the exhaust gases. The Engine-A/T-ECU determines whether the air-fuel ratio is at the optimal stoichiometric ratio in accordance with this oxygen concentration level.
	Intake air temperature sensor	This sensor, which contains a thermistor, detects the temperature of the intake air. The Engine-A/T-ECU makes fuel injection volume corrections that suit the intake air temperature, in accordance with the voltage that is output by this sensor.
	Engine coolant temperature sensor	This sensor, which contains a thermistor, detects the temperature of the engine coolant. The Engine-A/T-ECU determines the warm-up condition of the engine in accordance with the voltage that is output by this sensor, in order to control the fuel injection volume, idle speed, and ignition timing.
	Throttle position sensor (TPS) <main, sub>	This sensor detects the position of the throttle valve and inputs it into the Engine-A/T-ECU. Based on the voltage that is output by this sensor, the Engine-A/T-ECU effects throttle valve feedback control.
	Accelerator pedal position sensor (APS) <main, sub>	This sensor detects the position of the accelerator and inputs it into the Engine-A/T-ECU. Based on the voltage that is output by this sensor, which determines the accelerator position (and the intention of the driver), the Engine-A/T-ECU effects appropriate fuel injection and throttle valve position controls.
	Camshaft position sensor	This sensor detects the top-dead-center (TDC) of the compression stroke of each cylinder.
Sensors	Crank angle sensor	This sensor detects the crank angle and inputs it into the Engine-A/T-ECU. The Engine-A/T-ECU effects injector control and other controls in accordance with the signals received from this sensor.
	Detonation sensor	This sensor, which contains a piezoelectric element, detects the vibration of the cylinder block that results from knocking. The Engine-A/T-ECU detects only the knocking of the engine from these vibrations, in order to retard the ignition timing in accordance with the strength of the knocks.
	Power steering fluid pressure switch	This is a contact point type switch that detects the load on the power steering.
	A/C switch	Detects the ON/OFF condition of the A/C.
	A/C load signal	A/C inputs the drive state of the compressor (low load/high load) to the engine-A/T-ECU. The engine-A/T-ECU controls the A/C idle-up engine speed using this signal.
	A/C pressure sensor	A/C detects the refrigerant pressure and inputs the load of the A/C compressor to the engine-A/T-ECU.
	Alternator FR terminal	This terminal is used for detecting the duty cycle ratio that energizes the alternator field coil.
	Inhibitor switch	This is a contact point type switch that inputs a signal into the Engine-A/T-ECU to determine whether the shift lever is in the neutral position.
Actuators	Engine control relay	This relay turns ON and OFF the Engine-A/T-ECU power circuit.
	Throttle valve control servo relay	This relay turns ON and OFF the actuation power circuit for the throttle valve control servo in the Engine-A/T-ECU.
	Injector	The injectors inject fuel in accordance with the injection signals received from the Engine-A/T-ECU.
	Ignition coil (with power transistor)	Applies ignition coil primary current intermittently in accordance with the ignition signals received from the Engine-A/T-ECU, in order to generate high voltage for ignition.
	Fuel pump relay	Controls the power supplied to the fuel pump in accordance with the signals received from the Engine-A/T-ECU.
	A/C relay	Controls the operation of the A/C compressor in accordance with the signals received from the Engine-A/T-ECU.
	Purge control solenoid valve	Controls the flow rate of the purge air introduced into the surge tank in accordance with the signals received from the Engine-A/T-ECU.
	EGR valve (stepper motor)	Controls the EGR flow rate in accordance with the signals received from the Engine-A/T-ECU.
	Alternator G terminal	Controls the amount of current generated by the alternator in accordance with the signals received from the Engine-A/T-ECU.
	Fan controller	Controls the speed of the radiator fan and the condenser fan steplessly in accordance with the signals received from the Engine-A/T-ECU.
	Throttle valve control servo	Controls the throttle valve position in accordance with the signals received from the Engine-A/T-ECU.
	Oil control valve (OCV)	The oil control valve, which is actuated by the signals received from the Engine-A/T-ECU, changes the valve timing.
	Engine warning lamp (check warning lamp)	Illuminates to notify the driver of any abnormalities when a problem occurs with any of the sensors.
	Oxygen sensor heater	Turns ON and OFF the oxygen sensor heater circuit in accordance with the signals received from the Engine-A/T-ECU.