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. Power Supply Control
    When the ignition switch ON signal is input by the ignition switch, the engine-ECU turns ON the power transistor for controlling the engine control relay. As a result, current flows through the coil in the engine control relay, causing the relay switch to turn ON and supply power to the sensors and actuators.

    2. Glow Control
    (Refer to GROUP 16 - Glow System <4N1> - General Information ).

    3. EGR Control
    [Refer to GROUP 17 - Emission Control <DIESEL> - Exhaust Gas Recirculation (EGR) System- General Information (EGR system) ].

    4. A/C compressor Relay Control
    Turns the compressor clutch of the A/C ON and OFF.

    5. DPF System Control
    [Refer to GROUP 17 - Emission Control <DIESEL> - Diesel Particulate Filter (DPF) System - General Information (DPF system) ].

    6. Variable Geometry Turbocharger Control
    Performing the duty control over the variable geometry control solenoid valve, the engine-ECU opens and closes the nozzle vane located in the turbocharger assembly. This allows the boost pressure to be obtained in accordance with the engine operation.

    7. 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.

    8. Oil Feeder Control Valve Control <MIVEC>
    The engine-ECU effects duty cycle control on the oil feeder control valve, in accordance with the engine speed. This regulates the supply of engine oil to the intake rocker shaft, which switches the cams.

    9. Alternator Output Current Control
    Prevents the alternator output current from increasing suddenly and the idle speed from varying such as when the headlamp is turned on.



  • Auto Stop Prohibition Control
    When one or more of following conditions are satisfied during idling, the engine-ECU should send the auto stop prohibition signal to the AS&G-ECU.

  1. The engine coolant temperature is lower than approximately 50°C or is higher than approximately 90°C.
  2. The intake air temperature is higher than approximately 50°C.
  3. When one or more of the following conditions are satisfied, the vehicle is in "auto stop prohibition status" by electrical load.

  • The amount of the vehicle current consumption is more than the specified value.
  • The power generation control is in the forcible full charge mode.
  • When the battery is determined as being deteriorated.
  • DTC P0622, DTC P1608 or DTC U1004 is detected.
  • The diagnosis code causing the MIL to illuminate is detected.
  • Approximately 30 seconds have not been taken since the engine started.
  • When the small injection quantity learning is requested.

    • Forcible Auto Start Request Control
      When one or more of following conditions are satisfied during the auto stop, the engine-ECU should send the engine start request signal to the AS&G-ECU.

    1. The engine coolant temperature is lower than approximately 40 °C.
    2. The amount of the vehicle current consumption is more than the specified value.
    3. DTC P1608 is detected.
    4. When the DPF regeneration is requested.
    Items
    		 Specifications
    Engine-ECU
    		 Identification No. (Part No.)
    		 1860C107
    Sensors
    		 Air flow sensor
    		 Heat sensitizing type
    Engine oil pressure switch
    		 Contact switch type
    Barometric pressure sensor
    		 Semiconductor type
    No. 1 intake air temperature sensor
    		 Thermistor type
    Engine coolant temperature sensor
    		 Thermistor type
    Accelerator pedal position sensor
    		 Hall element type
    Camshaft position sensor
    		 Magneto resistance element type
    Crank angle sensor
    		 Magneto resistance element type
    Manifold absolute pressure sensor
    		 Piezo resistive semiconductor type
    Throttle position sensor
    		 Hall element type
    Battery temperature sensor
    		 Thermistor type
    Battery current sensor
    		 Hall element type
    Fuel temperature sensor
    		 Thermistor type
    Exhaust differential pressure sensor
    		 Piezo resistive semiconductor type
    EGR gas temperature sensor
    		 Thermistor type
    EGR valve position sensor
    		 Hall element type
    No. 1 exhaust gas temperature sensor
    		 Thermistor type
    No. 2 exhaust gas temperature sensor
    		 Thermistor type
    No. 3 exhaust gas temperature sensor
    		 Thermistor type
    Rail pressure sensor
    		 Piezo resistive semiconductor type
    Water level switch
    		 Contact switch type
    Actuators
    		 Engine control relay
    		 Contact switch type
    EGR valve
    		 DC motor type, having brushes
    Suction control valve
    		 Duty cycle type solenoid valve
    Fuel pump relay
    		 Contact switch type
    Injector type and number
    		 Solenoid control type, 4
    Injector identification mark
    		 G3S4
    Oil feeder control valve <MIVEC>
    		 Duty cycle type solenoid valve
    Throttle valve control servo
    		 DC motor type, having brushes
    Variable geometry control solenoid valve
    		 Linear type solenoid valve
    EGR cooler bypass control solenoid valve
    		 ON/OFF type solenoid valve
    A/C compressor relay
    		 Contact switch type
    Starter relay
    		 Contact switch type

    FUEL INJECTION SYSTEM DIAGRAM