GENERAL INFORMATION

LIST OF COMPONENT FUNCTIONS

Name		Function
ECU	Engine-A/T-ECU	Uses the signals input from the various sensors to control operation of actuators in accordance with the driving conditions.
Sensors	Ignition switch-IG	Detects the ON/OFF position of the ignition switch. When this signal is input to the engine-A/T-ECU, power is supplied to components such as the injectors, air flow sensor, idle speed control servo and crank angle sensor.
	Ignition switch-ST	Detects whether the engine is cranking. The engine-A/T-ECU controls the fuel injection, throttle valve opening angle and ignition timing to the appropriate settings based on this signal.
	Air flow sensor (AFS)	Senses air intake volume using karman flow meter. In accordance with this information and engine speed, engine-A/T-ECU controls injectors' basic activation duration.
	Barometric pressure sensor <DOHC>	Senses atmospheric pressure using semiconductor diffused pressure sensor. In accordance with data from this sensor, engine-A/T-ECU determines vehicle's altitude and adjusts fuel injection rate as a function of altitude to ensure appropriate air/fuel ratio.
	Manifold absolute pressure (MAP) sensor <SOHC>	Senses atmospheric pressure using the internal pressure of intake manifold when the ignition switch is in "ON" position and the throttle valve is fully opened. Detects the internal pressure changes of intake manifold in accordance with the EGR valve opening or closing. Performs the self-diagnostics of EGR systems.
	Manifold differential pressure (MDP) sensor <DOHC>	Detects the internal pressure changes of intake manifold in accordance with the EGR valve opening or closing. Performs the self-diagnostics of EGR system.
	Oxygen sensor	Detects the concentration of oxygen in the exhaust gas by means of zirconia and platinum electrodes. The engine-A/T-ECU judges whether the air/fuel mixture ratio is at the stoichiometric air fuel ratio based on this concentration.
	Intake air temperature sensor	Detects the temperature of the intake air by means of a thermistor. The engine-A/T-ECU corrects the fuel injection amount to the correct amount corresponding to the intake air temperature based on the voltage output from this sensor.
	Engine coolant temperature sensor	Detects the temperature of the engine coolant by means of a thermistor. The engine-A/T-ECU detects how warm the engine is based on the signal from this sensor, and uses this to control the fuel injection amount, idle speed and ignition timing.
	Throttle position sensor	Detects the throttle valve opening angle by means of a potentiometer. The engine-A/T-ECU controls the throttle valve and also determines the optimum fuel injection for how quick the throttle valve is opened based on the voltage output from this sensor.
Sensor	Detonation sensor	Detects cylinder block vibration when knocking is generated by the piezoelectric element. The engine-A/T-ECU controls retardation of the ignition timing according to the knocking strength.
	Camshaft position sensor	Detects the No. 1 cylinder compression top dead centre position by means of a magnetic resistance element.
	Crank angle sensor	Detects the crank angle by means of a hall element. The engine-A/T-ECU controls the injectors based on the signal from this sensor.
	Alternator FR terminal	Detects the energising duty ratio of the alternator field coil.
	Power steering fluid pressure switch	Detects whether there is a power steering load present by means of a contact switch.
	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.
Actuators	Engine control relay	Turns the engine-A/T-ECU power circuit on and off.
	Injector	Drives the fuel injection by means of drive signals from the engine-A/T-ECU. Maltiple spray hole type is used.
	Ignition coil (with power transistor)	Interrupts the ignition coil primary current in accordance with the ignition signals from the engine-A/T-ECU, in order to generate a high voltage for ignition.
	Idle speed control (ISC) servo (stepper motor)	The throttle valve bypass air amount during idling and deceleration is controlled with the signal from the engine-A/T-ECU.
	EGR control solenoid valve	Controls the EGR flow volume through signals under the duty control from the engine-A/T-ECU.
	Fuel pump relay	Turns the fuel pump on and off.
	Fan controller	Controls the radiator and condenser fan speeds smoothly by means of signals from the engine-A/T-ECU.
	Purge control solenoid valve	Controls the amount of purge air introduced to the air intake plenum by means of signals from the engine-A/T-ECU.
	Alternator G terminal	Controls the amount of power generated by the alternator through signals under the duty control from the engine-A/T-ECU.
	A/C relay	Controls the operation of the A/C compressor.
	Oxygen sensor heater	Heats up the oxygen sensor in response to the signals from the engine-A/T-ECU.
	Waste gate solenoid valve <DOHC>	Controls the boost pressure that affects the waste gate actuator in response to the signals from the engine-A/T-ECU.
	Fuel pressure control solenoid valve <DOHC>	Controls the fuel pressure in response to the signals form the engine-A/T-ECU.
	Engine warning lamp	Illuminates to notify the driver of any abnormalities when a problem occurs with any of the sensors.