SFI SYSTEM

FUNCTION OF MAIN COMPONENTS

1. The main components of the engine control system are as follows:

   Component	Outline	Quantity	Function
   ECM	Forest 2	1	The ECM optimally controls the engine control system to suit the operating conditions of the engine in accordance with the signals provided by the sensors.
   Air Fuel Ratio Sensor (Sensor 1)	Type with Heater (Planar Type)	1	Detects the oxygen concentration in the exhaust emissions by measuring the electromotive force which is generated in the sensor itself.
   Oxygen Sensor (Sensor 2)*1	Type with Heater (Cup Type)	1
   Air Fuel Ratio Sensor (Sensor 2)*2	Type with Heater (Cup Type)	1
   Intake Mass Air Flow Meter Sub-assembly	Hot-wire Type	1	Uses a built-in hot-wire to directly detect the intake air mass.
   Intake Air Temperature Sensor	Thermistor Type	1	Detects the intake air temperature.
   Engine Coolant Temperature Sensor	Thermistor Type	1	Detects the engine coolant temperature.
   Crank Position Sensor [Rotor Teeth]	Magnetic Resistance Element (MRE) Type [36 - 2]	1	Detects the engine speed and performs the cylinder identification.
   Camshaft Position Sensor [Rotor Teeth]	Magnetic Resistance Element (MRE) Type [3]	2	Performs the cylinder identification.
   VALVEMATIC Shaft Sensor (Crank Position Sensor)*2	MagneticResistanceElement (MRE)Type	1	Detects operation of the VALVEMATIC controlshaft driven by the motor.
   Throttle Position Sensor	Non-contact Type	1	Detects the throttle valve opening angle.
   Accelerator Pedal Sensor Assembly	Non-contact Type	1	Detects the amount of pedal effort applied to the accelerator pedal.
   Knock Control Sensor	Built-in Piezoelectric Element Type (Flat Type)	1	Detects an occurrence of engine knocking indirectly from the vibration of the cylinder block caused by the occurrence of engine knocking.
   Vacuum Sensor Assembly	Semiconductor Silicon Chip Type	1	Detects the intake manifold pressure. Corrects the fuel injection in accordance with variations in air pressure. Detects the presence of deposits in the intake valve by determining the intake manifold pressure.
   Continuously Variable Valve Lift Controller Assembly	Built-in EDU	1	Includes the EDU and controls the motor in response to signals from the ECM in order to regulate the amount of intake valve lift and the intake valve action angle. The built-in motor position sensor detects the motor position. The built-in action angle sensor detects the position of the actuator in order to confirm the action angle.
   Camshaft Timing Oil Control Valve Assembly	Solenoid Type	2	Changes the oil passage to the VVT-i controller in response to signals from the ECM.
   Throttle Control Motor	DC Motor	1	Regulates the opening of the throttle valve in accordance with the signals from the ECM.
   Fuel Injector Assembly	12-hole Type	4	The fuel injector assembly is an electromagnetically-operated nozzle which injects fuel in accordance with the signals from the ECM.
   Ignition Coil Assembly	Type with Igniter	4	Incorporates an igniter and provides a high level of voltage necessary for ignition in accordance with signals from the ECM.
   Spark Plug	Iridium-tipped Type	4	Sparks a high level of voltage from the ignition coil assembly inside the cylinder.

   *1: Models without canister pump module.

   *2: Models with canister pump module.

SYSTEM CONTROL

1. The engine control system has the following features. The ECM controls these systems:

   System	Outline
   Sequential Multiport Fuel Injection (SFI)	An L-type SFI system detects the intake air mass with a hot-wire type intake mass air flow meter sub-assembly. The fuel injection system is a sequential multiport fuel injection system.
   Electronic Spark Advance (ESA)	Ignition timing is determined by the ECM based on signals from various sensors. The ECM corrects ignition timing in response to engine knocking.
   Electronic Throttle Control System-intelligent (ETCS-i)	Optimally controls the throttle valve opening in accordance with the amount of accelerator pedal effort, the throttle valve opening control request from the ECM, and the condition of the engine and the vehicle.
   VALVEMATIC	Effects coordinate control with the Dual VVT-i in order to control the amount of intake valve lift, and intake and exhaust valve timing.
   Dual Variable Valve Timing-intelligent (Dual VVT-i)	Regulates operation of the intake and exhaust camshafts to ensure an optimal valve timing in accordance with the engine condition.
   Fuel Pump Control	Fuel pump operation is controlled by signals from the ECM. The fuel pump is stopped when any of the Supplemental Restraint System (SRS) airbags are deployed.
   Air Conditioning Cut-off Control	By turning the air conditioning compressor assembly on or off in accordance with the engine condition, driveability is maintained.
   Cooling Fan Control	Radiator cooling fan operation is controlled by signals from the ECM based on the engine coolant temperature sensor signal (THW) and the operating condition of the air conditioning system.
   Starter Control	Once the engine switch is pushed, this control continues to operate the starter until the engine has started.
   Evaprative Emission Control	The ECM controls the purge flow of evaporative emissions (HC) in the charcoal canister in accordance with engine conditions. Approximately five hours after the ignition switch is turned off, theECM operates the leak detection pump to detect any fuel vapor leaksbetween the fuel tank assembly and the canister through changes inthe fuel tank pressure.*1
   Air Fuel Ratio Sensor Control	Maintains the temperature of the air fuel ratio sensor and oxygen sensor at an appropriate level to increase accuracy of detection of the oxygen concentration in the exhaust gas.
   Oxygen Sensor Heater Control*2
   Engine Immobiliser	Prohibits fuel delivery and ignition if an attempt is made to start the engine with an invalid key.
   Brake Override System	The driving torque is restricted when both the accelerator and brake pedals are depressed.
   Drive Start Control System	Even if the driver is in a hurry and abnormal accelerator pedal and shift operations are performed, vehicle speed and acceleration are restricted to improve the sense of security felt by the driver.
   Oil Maintenance Reminder System	The oil maintenance information message is shown on the multi-information display according to the vehicle condition to inform the driver. For details, see the METER / GAUGE SYSTEM section.
   Diagnosis	When the ECM detects a malfunction, the ECM diagnoses and memorizes the failed section.
   Fail-safe	When the ECM detects a malfunction, the ECM stops or controls the engine according to the data already stored in memory.

   *1: Models with canister pump module.

   *2: Models without canister pump module.