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)	2 (1 each bank)	Detects the oxygen concentration in the exhaust emissions by measuring the electromotive force which is generated in the sensor itself.
   		Heated Type (Cup Type)	2 (1 each bank)
   Intake 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.
   Fuel Pressure Sensor	For Low Pressure	Semiconductor Type	1	Detects the fuel pressure in the fuel delivery pipe sub-assembly.
   	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 the cylinder identification.
   Cam Position Sensor (No. 2 Crank Position Sensor) (Intake) [No. of Rotor Teeth]		Magnetic Resistance Element (MRE) Type [3]	2 (1 each bank)	This sensor performs cylinder identification. This sensor is used to detect the intake camshaft position.
   Cam Position Sensor (No. 2 Crank Position Sensor) (Exhaust) [No. of Rotor Teeth]		Magnetic Resistance Element (MRE) Type [3]	2 (1 each bank)	This sensor performs cylinder identification. This sensor is used to detect the exhaust camshaft position.
   E.F.I. Vacuum Sensor Assembly		Semiconductor Silicon Chip Type	1	Detects the pressure in the intake manifold and sends signals to the ECM.
   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.
   Knock Control Sensor		Built-in Piezoelectric Element Type (Flat Type)	2 (1 each bank)	Detects an occurrence of engine knocking indirectly from the vibration of the cylinder block caused by the occurrence of engine knocking.
   Cam Timing Oil Control Solenoid Assembly		Solenoid Type	4	Changes the oil passage to the VVT-i controller in response to signals from the ECM.
   Fuel Injector Assembly	For Port Injection	12-hole Type	6	This injector is an electromagnetically-operated nozzle which injects fuel in accordance with signals from the ECM.
   	For Direct Injection	High Pressure Single Slit Nozzle Type	6	This injector contains a high-pressure electromagnetically-operated nozzle used to inject fuel directly into the cylinder.
   Ignition Coil Assembly		Type with Igniter	6	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	6	Sparks a high level of voltage from the ignition coil assembly inside the cylinder.
   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.

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 silicon chip type intake 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 the 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)	Regulates operation of the intake camshaft and exhaust camshaft to ensure optimal valve timing in accordance with the engine condition.
   Cooling Fan Control	The cooling fan controller 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 are deployed.
   Fuel Pump Control (for High Pressure)	Regulates the fuel pressure within a range of 2 to 20 MPa in accordance with driving conditions.
   Air Fuel Ratio Sensor Heater Control	Maintains the temperature of the air fuel ratio sensor at an appropriate level to increase the ability of the sensor to accurately detect the oxygen concentration in the exhaust gas.
   Cooled 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.
   Evaporative Emission Control*1	A control system that functions as follows is used: When the engine is stopped while the vehicle is in motion or at rest, the fuel vapor-containment valve (fuel tank solenoid main valve assembly) keeps the fuel tank assembly sealed to prevent fuel vapors from being discharged. Only when the engine is operating, the fuel vapor-containment valve (fuel tank solenoid main valve assembly) operates, allowing the canister to absorb the fuel vapors, which are subsequently consumed by the engine. A refueling control system that functions as follows is used: When the internal pressure of the fuel tank assembly is high because it is sealed, this system lowers the internal pressure of the fuel tank assembly before opening the fuel lid for refueling. The ECM controls the purge flow of fuel vapors from the canister in accordance with engine operating conditions. When approximately 5 hours elapse after the power switch is turned off, the ECM operates the leak detection pump to detect any fuel vapor leaks between the fuel tank assembly and canister through changes in the fuel tank pressure.
   Evaporative Emission Control*2	The ECM controls the purge flow of evaporative emissions (HC) from the canister in accordance with the engine operating conditions.

   *1: Models for Korea

   *2: Except Models for Korea

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.