SFI SYSTEM


  1. 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 The ECM optimally controls the SFI, ESA and ISC to suit the operating conditions of the engine in accordance with the signals provided by the sensors.
      Intake Mass Air Flow Meter Sub-assembly Hot-wire Type 1 This sensor has a built-in hot-wire to directly detect the intake air mass.
      Intake Air Temperature Sensor Thermistor Type 1 This sensor detects the intake air temperature by means of an internal thermistor.
      Engine Coolant Temperature Sensor Thermistor Type 1 This sensor detects the engine coolant temperature by means of an internal thermistor.
      Crankshaft Position Sensor [Rotor Teeth] Pick-up Coil Type [36 - 2] 1 This sensor detects the engine speed and performs cylinder identification.
      Camshaft Position Sensor for Intake [Rotor Teeth] Magnetic Resistance Element (MRE) Type [3] 2 (1 on each bank) This sensor performs cylinder identification.
      Camshaft Position Sensor for Exhaust [Rotor Teeth] Magnetic Resistance Element (MRE) Type [3] 2 (1 on each bank) This sensor performs cylinder identification.
      Accelerator Pedal Position Sensor Linear (Non-contact) Type 1 This sensor detects the amount of pedal effort applied to the accelerator pedal.
      Throttle Position Sensor Linear (Non-contact) Type 1 This sensor detects the throttle valve opening angle.
      Knock Control Sensor (Bank 1 and Bank 2) Built-in Piezoelectric Type (Non-resonant Type/ Flat Type) 2 (1 on each bank) This sensor detects an occurrence of engine knocking indirectly from the vibration of the cylinder block caused by the occurrence of engine knocking.
      Air Fuel Ratio Sensor (Bank 1, Sensor 1) (Bank 2, Sensor 1) Heated Type (Planar Type) 2 (1 on each bank) As with the oxygen sensor, this sensor detects the oxygen concentration in the exhaust emissions. However, it detects the oxygen concentration in the exhaust emissions linearly.
      Oxygen Sensor (Bank 1, Sensor 2) (Bank 2, Sensor 2) Heated Type (Cup Type) 2 (1 on each bank) This sensor detects the oxygen concentration in the exhaust emissions by measuring the electromotive force which is generated in the sensor itself.
      Fuel Injector Assembly 12-hole Type 6 The fuel injector assembly is an electromagnetically-operated nozzle which injects fuel in accordance with signals from the ECM.

  2. 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 directly 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.

      • This system selects the optimal ignition timing in accordance with the signals received from the sensors and sends (IGT) ignition signals to the igniters.
      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.
      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 conditions.
      Fuel Pump Control

      • Based on signals from the ECM, the fuel pump control ECU controls the fuel pump in 3 stages.

      • The fuel pump is stopped when the SRS airbag is deployed in a frontal, side, or side rear collision.
      Air Conditioning Cut-off Control By turning the air conditioning compressor assembly on or off in accordance with the engine conditions, driveability is maintained.
      Starter Control (Cranking Hold Function) Once the engine switch is pushed, this control continues to operate the starter until the engine has started.
      Air Fuel Ratio Sensor and Oxygen Sensor Heater Control Maintains the temperature of the air fuel ratio sensors or oxygen sensors at an appropriate level to increase the detection accuracy of the exhaust gas oxygen concentration.
      Engine Immobiliser Prohibits fuel delivery and ignition if an attempt is made to start the engine with an invalid key.
      Brake Override System Restricts the driving torque when both the accelerator and brake pedals are depressed. (For the Activation Conditions and Inspection Method, refer to the Repair Manual.)
      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 in accordance with the data already stored in memory.