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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. |
|