SFI SYSTEM

FUNCTION OF MAIN COMPONENTS

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

   Component		Outline	Quantity	Function
   ECM		32-bit CPU	1	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		Heated Type (Planar Type)	1	Detects the oxygen concentration in the exhaust gas by measuring the electromotive force which is generated in the sensor itself.
   No. 2 Air Fuel Ratio Sensor		Heated Type (Cup Type)	1
   Mass Air Flow Meter Sub-assembly	Air Flow Meter	Silicon Chip Type	1	Uses a built-in silicon chip 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.
   Temperature Sensor		Thermistor Type	1	Detects the engine oil temperature.
   Fuel Pressure Sensor (Fuel Delivery Pipe with Sensor Sub-assembly) (for Low Pressure)		Semiconductor Type	1	Detects the fuel pressure in the fuel delivery pipe sub-assembly.
   Fuel Pressure Sensor (for High Pressure)		Semiconductor Type	1
   Crank Position Sensor [No. of Rotor Teeth]		Magnetic Resistance Element (MRE) Type [36 - 2]	1	Detects the engine speed and performs cylinder identification.
   Camshaft Position Sensor [No. of Rotor Teeth]		Magnetic Resistance Element (MRE) Type [3]	2	Performs cylinder identification.
   Throttle Body with Motor Assembly	Throttle Position Sensor	Non-contact Type	1	Detects the throttle valve opening angle.
   	Throttle Control Motor	DC Motor	1	Regulates the opening of the throttle valve in accordance with the signals from the ECM.
   Vacuum Sensor Assembly		Semiconductor Silicon Chip Type	1	Detects the pressure in the intake manifold and sends signals to the ECM.
   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 engine knocking indirectly through the vibration of the cylinder block caused by engine knocking.
   Oil Pressure Sender Gauge Assembly		Semiconductor Type	1	Detects the engine oil pressure.
   Cam Timing Control Motor with EDU Assembly		EDU-integrated (Brushless Type DC Motor)	1	The rotational movement of the cam timing control motor with EDU assembly changes the intake valve timing by operating the camshaft timing gear assembly in accordance with the signals received from the ECM.
   Cam Timing Oil Control Solenoid Assembly		Solenoid Type	1	Controls the exhaust camshaft phase to achieve the optimal valve timing by moving the oil control valve.
   Port Fuel Injector Assembly		10-hole Type	4	This injector is an electromagnetically-operated nozzle which injects fuel in accordance with signals from the ECM.
   Direct Fuel Injector Assembly		6-hole Type	4	This injector contains a high-pressure electromagnetically-operated nozzle used to inject fuel directly into the cylinder.
   Ignition Coil Assembly		Type with Igniter	4	Incorporates an igniter and provides the high voltage electricity necessary for ignition in accordance with signals from the ECM.
   Spark Plug		Iridium-tipped Type	4	Produces a spark inside the cylinder using high voltage electricity delivered from the ignition coil assembly
   EGR Valve Assembly		Step Motor Type	1	Opens and closes based on signals from the ECM and controls the flow rate of the exhaust gas in the EGR bypass.
   Flow Shutting Valve (Water Valve) (for Heater Control)		Solenoid Type	1	Selects a coolant passage based on signals from the ECM.
   Flow Shutting Valve (Water Valve) (for ATF Control)		Solenoid Type	1
   Engine Water Pump Assembly (Water Inlet Housing)		Electric Type	1	Optimizes coolant circulation based on signals from the ECM.
   Water Inlet with Thermostat Sub-assembly	Thermostat with Heater	Wax with Heater Assist Type	1	Assists opening the thermostat with heater valve based on signals from the ECM.
   Oil Pressure Control Valve Assembly		Solenoid Type	1	Changes the oil passage to the oil pump assembly in response to signals from the ECM.

SYSTEM CONTROL

1. The engine control system has the following features:

   System	Outline
   Direct Injection 4-stroke Gasoline Engine Superior Version Sequential Multiport Fuel Injection (D-4S SFI) System	This is an L-type SFI system. It directly detects the intake air volume with a hot-wire type mass air flow meter sub-assembly. The D-4S SFI system is a fuel injection system which combines direct injection injectors and port injection injectors. Based on signals from each sensor, the ECM controls the injection volume and timing of each type of injector (direct and port injection types) in accordance with the engine speed and engine load in order to optimize combustion conditions.
   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. This system determines the optimal ignition timing in accordance with the signals received from the sensors and sends ignition (IGT) signals to the igniters.
   Electronic Throttle Control System-intelligent (ETCS-i)	Optimally controls the opening angle of the throttle valve in accordance with the accelerator pedal input and the engine and vehicle operating conditions.
   Dual Variable Valve Timing-intelligent (Dual VVT-i)	Controls the intake and exhaust camshafts to the optimal valve timing in accordance with the engine operating conditions. VVT-iE is used for the intake camshaft. VVT-iE uses electric motors to control the valve timing. VVT-i is used for the exhaust camshaft and uses engine oil pressure to control the valve timing.
   Cooling Fan Control	The cooling fan ECU steplessly controls the speed of the fans in accordance with the engine coolant temperature, vehicle speed, engine speed, and air conditioning operating conditions. As a result, the cooling performance is improved.
   Fuel Pump Control (for Low Pressure)	Based on signals from the ECM, the fuel pump control ECU controls the fuel pump. The fuel pump is stopped when any of the Supplemental Restraint System (SRS) airbags is deployed in a collision.
   Fuel Pump Control (for High Pressure)	Regulates the fuel pressure within a range of 2.4 to 20 MPa in accordance with driving conditions.
   Air Fuel Ratio Sensor and No. 2 Air Fuel Ratio Sensor Heater Control	Maintains the temperature of the air fuel ratio sensor or No. 2 air fuel ratio sensor at an appropriate level to increase the ability of each sensor to accurately detect the oxygen concentration in the exhaust gas.
   Exhaust Gas Recirculation (EGR) Control	Based on the signals received from the sensors, the ECM determines the EGR volume in accordance with the engine operating conditions.
   Cranking Hold Function (Starter Control)	Once the engine switch is pushed, this control operates the starter until the engine starts.
   Drive Start Control System	If an abnormal shift (R to D/S, D/S to R, N to R, P to D/S, P to R) is detected while accelerating, a warning is displayed in the combination meter assembly and motive force is reduced to limit the acceleration, helping to avoid a collision.
   Brake Override System	The driving torque is restricted when both the accelerator and brake pedals are depressed. (For the Activation Conditions and Inspection Method, refer to the repair manual)
   Active Control Engine Mount	The damping characteristics of the front and rear engine mount are varied to reduce idle vibration.
   Variable Oil Pump Control	Optimizes the oil pressure required for each component by controlling the oil pressure control valve assembly in accordance with the engine condition.
   Variable Cooling Control	Optimizes the volume of coolant flow in accordance with the driving condition by using the thermostat with heater, engine water pump assembly (water inlet housing) and flow shutting valve (water valve).
   Evaporative Emission Control	The ECM controls the purge flow of evaporative emissions (HC) from the canister in accordance with the engine operating conditions. Approximately five hours after the engine switch is turned off, the ECM operates the leak detection pump to detect any fuel vapor leaks between the fuel tank assembly and the canister through changes in the fuel tank pressure.
   Engine Immobiliser	Prohibits fuel delivery and ignition if an attempt is made to start the engine with an invalid key.

FAIL-SAFE

1. When a malfunction of any of the sensors is detected, there is a possibility of an engine or other malfunction occurring if the ECM were to continue normal control. To prevent such a problem, the fail-safe function of the ECM either relies on the data stored in memory to allow the engine control system to continue operating, or stops the engine if a hazard is anticipated. For details, refer to the Repair Manual.

DIAGNOSIS

1. When the ECM detects a malfunction, the ECM records information related to the fault. Furthermore, the Malfunction Indicator Lamp (MIL) in the combination meter assembly illuminates or blinks to inform the driver.

2. The ECM also stores Diagnostic Trouble Codes (DTCs) for malfunctions it has detected. The DTCs can be accessed by using the Global TechStream (GTS).

3. For details, refer to the Repair Manual.