ENGINE - 2AZ-FXE ENGINE
EG-35
5. Main Component of Engine Control System
General
The main components of the 2AZ-FXE engine control system are as follows:
Components
Outline
Quantity
Function
THS ECU
32-bit CPU
1
The THS ECU optimally controls the SFI,
ESA and ISC to suit the operating
conditions of the engine in accordance
with the signals provided by the sensors.
Oxygen Sensor
(Bank 1, Sensor 2)
Cup Type
with Heater
1
This sensor detects the oxygen
concentration in the exhaust emission by
measuring the electromotive force which
is generated in the sensor itself.
Air Fuel
Ratio Sensor
(Bank 1, Sensor 1)
Planar Type
with Heater
1
As with the oxygen sensor, this sensor
detects the oxygen concentration in the
exhaust emission. However, it detects the
oxygen concentration in the exhaust
emission linearly.
Mass Air Flow Meter
Hot-wire Type
1
This sensor has a built-in hot-wire to
directly detect the intake air mass.
Crankshaft
Position Sensor
(Rotor Teeth)
Pick-up Coil Type
(36-2)
1
This sensor detects the engine speed and
performs the cylinder identification.
Camshaft
Position Sensor
(Rotor Teeth)
Pick-up Coil Type
(36-2)
1
This sensor performs the cylinder
identification.
Engine Coolant
Temperature Sensor
Thermistor Type
1
This sensor detects the engine coolant
temperature by means of an internal
thermistor.
Intake Air
Temperature Sensor
Thermistor Type
1
This sensor detects the intake air
temperature by means of an internal
thermistor.
Knock Sensor
Built-in
Piezoelectric Type
(Flat Type)
1
This sensor detects an occurrence of the
engine knocking indirectly from the
vibration of the cylinder block caused by
the occurrence of engine knocking.
Throttle
Position Sensor
No-contact Type
1
This sensor detects the throttle valve
opening angle.
Injector
12-Hole Type
4
The injector is an electromagnetically-
operated nozzle which injects fuel in
accordance with signals from the THS
ECU.
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