Main Component of Engine Control System General

The main components of the 2AZ-FE engine control system are as follows:

Components

Outline

Quantity

Function

ECM

32-bit CPU

1

The ECM 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.

Accelerator Pedal Position Sensor

No-contact Type

1

► This sensor detects the amount of pedal effort applied to the accelerator pedal.

► The sensor shape is different between TMC made models and TMMK made models. However, those are the no-contact type sensors using Hall IC.

Injector

12-Hole Type

4

The injector is an electromagnetically-operated nozzle which injects fuel in accordance with signals from the ECM.

Mass Air Flow Meter

► This mass air flow meter, which is a plug-in type, allows a portion of the intake air to flow through the detection area. By directly measuring the mass and the flow rate of the intake air, the detection precision is improved and the intake air resistance is reduced.

► This mass air flow meter has a built-in intake air temperature sensor.

Hot Wire Airflow Sensor

Intake Air Temp. Sensor

Temperature Sensing Element

Platinum Hot-Wire Element

Temperature Sensing Element

Intake Air Temp. Sensor

Crankshaft Position Sensor

The timing rotor of the crankshaft consists of 34 teeth, with 2 teeth missing. The crankshaft position sensor outputs the crankshaft rotation signals every 10# and the missing teeth are used to determine the top-dead-center.

Timing Rotor

Timing Rotor

Toyota Carina Crankshaft Sensor

Crankshaft Position Sensor

Timing Rotor (720GCA)

10GCA-

2-Teeth Missing

01YEG10Y

Crankshaft Position Sensor

208EG24

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