[13B] MULTIPOINT FUEL INJECTION (MPI) <4G64> - - GENERAL INFORMATION | PRINT PAGE / INDEX / PRIOR / NEXT

GENERAL INFORMATION The control system is basically the same as that of the 4G6 engine used in the Galante.
SYSTEM BLOCK DIAGRAM
MULTI POINT FUEL INJECTION SYSTEM DIAGRAM
LIST OF COMPONENT FUNCTIONS
Name | Function
--- | ---
ECU | Engine-A/T-ECU | Uses the signals input from the various sensors to control operation of actuators in accordance with the driving conditions.
Sensors | Ignition switch-IG | Detects the ON/OFF position of the ignition switch. When this signal is input to the engine-A/T-ECU, power is supplied to components such as the injectors, air flow sensor, idle speed control servo and crank angle sensor.
Ignition switch-ST | Detects whether the engine is cranking. The engine-A/T-ECU controls the fuel injection, throttle valve opening angle and ignition timing to the appropriate settings based on this signal.
Air flow sensor (AFS) | Senses air intake volume using karman flow meter. In accordance with this information and engine speed, engine-A/T-ECU controls injectors' basic activation duration.
Barometric pressure sensor | Senses atmospheric pressure using semiconductor diffused pressure sensor. In accordance with data from this sensor, engine-A/T-ECU determines vehicle's altitude and adjusts fuel injection rate as a function of altitude to ensure appropriate air/fuel ratio.
Intake air temperature sensor | Detects the temperature of the intake air by means of a thermistor. The engine-A/T-ECU corrects the fuel injection amount to the correct amount corresponding to the intake air temperature based on the voltage output from this sensor.
Engine coolant temperature sensor | Detects the temperature of the engine coolant by means of a thermistor. The engine-A/T-ECU detects how warm the engine is based on the signal from this sensor, and uses this to control the fuel injection amount, idle speed and ignition timing.
Throttle position sensor | Detects the throttle valve opening angle by means of a potentiometer. The engine-A/T-ECU controls the throttle valve and also determines the optimum fuel injection for how quick the throttle valve is opened based on the voltage output from this sensor.
Detonation sensor | Detects cylinder block vibration when knocking is generated by the piezoelectric element. The engine-A/T-ECU controls retardation of the ignition timing according to the knocking strength.
Camshaft position sensor | Detects the No. 1 cylinder compression top dead centre position by means of a magnetic resistance element.
Crank angle sensor | Detects the crank angle by means of a hall element. The engine-A/T-ECU controls the injectors based on the signal from this sensor.
Alternator FR terminal | Detects the energising duty ratio of the alternator field coil.
Sensor | Power steering fluid pressure switch | Detects whether there is a power steering load present by means of a contact switch.
A/C switch | Detects the ON/OFF condition of the A/C.
A/C load signal | A/C inputs the drive state of the compressor (low load/high load) to the engine-A/T-ECU. The engine-A/T-ECU controls the A/C idle-up engine speed using this signal.
A/C pressure sensor | A/C detects the refrigerant pressure and inputs the load of the A/C compressor to the engine-A/T-ECU.
Actuators | Engine control relay | Turns the engine-A/T-ECU power circuit on and off.
Injector | Drives the fuel injection by means of drive signals from the engine-A/T-ECU. Multiple spray hole type is used.
Ignition coil (with power transistor) | Interrupts the ignition coil primary current in accordance with the ignition signals from the engine-A/T-ECU, in order to generate a high voltage for ignition.
Idle speed control (ISC) servo (stepper motor) | The throttle valve bypass air amount during idling and deceleration is controlled with the signal from the engine-A/T-ECU.
EGR control solenoid valve | Controls the EGR flow volume through signals under the duty control from the engine-A/T-ECU.
Fuel pump relay | Turns the fuel pump on and off.
Fan controller | Controls the radiator and condenser fan speeds smoothly by means of signals from the engine-A/T-ECU.
Alternator G terminal | Controls the amount of power generated by the alternator by means of signals from the engine-A/T-ECU.
A/C relay | Controls the operation of the A/C compressor.
Engine warning lamp | Illuminates to notify the driver of any abnormalities when a problem occurs with any of the sensors.

[13B] MULTIPOINT FUEL INJECTION (MPI) <4G64> - - GENERAL INFORMATION | PRINT PAGE / INDEX / PRIOR / NEXT

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