SFI SYSTEM

FUNCTION OF MAIN COMPONENTS

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

   Component		Function
   ECM		Optimally controls the engine control system to suit the operating conditions of the engine in accordance with the signals provided by the sensors.
   Mass Air Flow Meter Sub-assembly	Air Flow Meter	This sensor has a built-in hot-wire element to directly detect the intake air mass.
   	Intake Air Temperature Sensor	Detects the intake air temperature.
   Engine Coolant Temperature Sensor		Detects the engine coolant temperature.
   Fuel Pressure Sensor	For Low Pressure	Detects the fuel pressure in the fuel delivery pipe sub-assembly.
   	For High Pressure
   Crank Position Sensor		Detects the engine speed and performs the cylinder identification.
   Cam Position Sensor (No. 2 Crank Position Sensor)		Performs the cylinder identification.
   Cam Timing Oil Control Solenoid Assembly (Intake)		Controls the intake camshaft (camshaft) phase to achieve the optimal valve timing by moving the oil control valve.
   Cam Timing Oil Control Solenoid Assembly (Exhaust)		Controls the exhaust camshaft (camshaft) phase to achieve the optimal valve timing by moving the oil control valve.
   Air Fuel Ratio Sensor		Detects the oxygen concentration in the exhaust emissions by measuring the electromotive force which is generated in the sensor itself.
   Heated Oxygen Sensor
   Knock Control Sensor		Detects an occurrence of engine knocking indirectly from the vibration of the cylinder block caused by the occurrence of engine knocking.
   Throttle Body with Motor Assembly	Throttle Position Sensor	Detects the throttle valve opening angle.
   	Throttle Control Motor	Regulates the opening of the throttle valve in accordance with the signals from the ECM.
   Accelerator Pedal Sensor Assembly		Detects the amount of pedal effort applied to the accelerator pedal.
   Fuel Injector Assembly (For Direct Injection)		This injector contains a high-pressure electromagnetically-operated nozzle used to inject fuel directly into the cylinder.
   Fuel Injector Assembly (For Port Injection)		This injector is an electromagnetically-operated nozzle which injects fuel in accordance with signals from the ECM.
   Ignition Coil Assembly		Incorporates an igniter and provides a high level of voltage necessary for ignition in accordance with signals from the ECM.
   Spark Plug		Sparks a high level of voltage from the ignition coil assembly inside the cylinder.
   Water Inlet with Thermostat Sub-assembly	Thermostat with Heater	Based on signals from the ECM, the thermostat with heater is opened and closed.

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.
   Variable Valve Timing-intelligent Wide (VVT-iW)	Regulates operation of the intake camshaft to ensure optimal valve timing in accordance with the engine operating conditions.
   Variable Valve Timing-intelligent (VVT-i)	Regulates operation of the exhaust camshaft to ensure optimal valve timing in accordance with the engine operating conditions.
   Fuel Pump Control (for Low Pressure)	Based on signals from the ECM, the fuel pump control ECU assembly controls the fuel pump. The fuel pump is stopped when any of the Supplemental Restraint System (SRS) airbags are deployed.
   Variable Fuel Pressure Control	Controls the fuel pressure (low pressure) by controlling the fuel pump (for low pressure) speed in accordance with the engine condition.
   Fuel Pump Control (for High Pressure)	Regulates the fuel pressure within a range of 2.4 to 20 MPa in accordance with driving conditions.
   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.
   Air Fuel Ratio Sensor and Heated Oxygen Sensor Heater Control	Maintains the temperature of the air fuel ratio sensor and heated oxygen sensor at an appropriate level to increase the ability of each sensor to accurately detect the oxygen concentration in the exhaust gas.
   Thermostat Heater Control	Controls the thermostat with heater in accordance with the engine condition and vehicle operating conditions.
   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)
   Drive Start Control	If an abnormal shift (R to D/M, D/M to R, N to R, P to D/M, P to R) is detected while accelerating, a warning is displayed in the combination meter assembly and driving force is reduced to limit the acceleration, helping to avoid a collision.
   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.

   *: Destination package for South 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.