GENERAL INFORMATION





FUEL INJECTION CONTROL




IDLE SPEED CONTROL





SELF-DIAGNOSIS FUNCTION



  • When an abnormality is detected in any of the sensors or actuators, the engine warning lamp illuminates to warn the driver.
  • When an abnormality is detected in any of the sensors or actuators, a diagnosis code number corresponding to the problem which occurred is output.
  • The RAM data relating to the sensors and actuators which is stored in the engine-ECU can be read using the M.U.T.-III. In addition, the actuator can be force-driven under certain conditions.

OTHER CONTROL FUNCTIONS



  1. Fuel Pump Control
    Turns the fuel pump relay ON so that current is supplied to the fuel pump while the engine is cranking or running.
  2. Glow Control
    The engine-ECU sends the information for the glow function to the automatic glow period control unit.
  3. EGR Control
    The engine-ECU controls the EGR control solenoid valve, the intake air control flap, and the EGR cooler solenoid valve to supply optimum EGR amount according to the drive conditions.
  4. Boost Pressure Control
    The variable geometry solenoid valve is duty controlled by the engine-ECU to control the variable nozzle-opening angle of the variable geometry turbocharger. This allows obtaining the characteristic of boost pressure corresponding to the engine operation condition.
  5. A/C Compressor Control
    Actuated the A/C compressor in accordance with the signals provided by the A/C-ECU via Controller Area Network (CAN) communication.
  6. Alternator Control
    The engine-ECU supplies the excitation current to the alternator and monitors the alternator load. The engine-ECU requests the charging warning lamp to go ON/OFF based on the alternator load and the battery voltage.
  7. Starter Relay Control
    When an ignition switch-ST signal is input from the ignition switch, the engine-ECU turns ON the power transistor for controlling the starter relay. As a result, current flows through the coil of the starter relay, turns ON the relay switch, and actuates the starter motor.

FUEL INJECTION SYSTEM BLOCK DIAGRAM