Engine Control System General

The engine control system for the 2AZ-FE engine has the following systems.

System

Outline

Sequential Multiport Fuel Injection

• An L-type SFI system directly detects the intake air volume with a hot-wire type mass air flow meter.

• The fuel injection system is a sequential multiport fuel injection system.

Electronic Spark Advance

Ignition timing is determined by the ECM based on signals from various sensors. The ECM corrects ignition timing in response to engine knocking.

ETCS-i Electronic Throttle Control System-intelligent (See page-43)

Optimally controls the throttle valve opening in accordance with the amount of accelerator pedal effort and the condition of the engine and the vehicle.

• A linkless-type is used, without an accelerator cable.

• An accelerator pedal position sensor is provided on the accelerator pedal.

• A non-contact type throttle position sensor and accelerator pedal position sensor are used.

VVT-i

Variable Valve Timing-intelligent (See page EG-48)

Controls the intake camshaft to an optimal valve timing in accordance with the engine condition.

Air-fuel Ratio Sensor, Oxygen Sensor Heater Control

Maintains the temperature of the air-fuel ratio sensor or oxygen sensor at an appropriate level to realize accuracy of detection of the oxygen concentration in the exhaust gas.

Air Conditioning Cut-off Control

By turning the air conditioning compressor ON or OFF in accordance with the engine condition, drivability is maintained.

Cooling Fan Control (See page EG-52)

Radiator cooling fan operation is controlled by signals from ECM based on the engine coolant temperature sensor signal and the condition of the air conditioning operation.

Fuel Pump Control (See page EG-53)

• Fuel pump operation is controlled by signal from the ECM.

• The fuel pump is stopped when the SRS driver's and front passenger's airbags are deployed.

Evapotative Emission Control

(See page EG-54)

The ECM controls the purge flow of evaporative emissions (HC) in the canister in accordance with engine conditions.

Approximately five hours after the ignition switch has been turned OFF, the ECM operates the canister pump module to detect any evaporative emission leakage occurring in the EVAP (evaporative emission) control system through changes in the 0.02 in. leak pressure.

Charging Control (See page EG-65)

The ECM regulates the charging voltage of the generator in accordance with the driving conditions and the charging state of the battery.

(Continued)

System

Immobilizer*2

Prohibits fuel delivery and ignition if an attempt is made to start the engine with an invalid ignition key.

Diagnosis (See page EG-67)

When the ECM detects a malfunction, the ECM diagnoses and memorizes the failed section.

Fail-safe

(See page EG-67)

When the ECM detects a malfunction, the ECM stops or controls the engine according to the data already stored in memory.

*2: Models with Engine Immobilizer System

*2: Models with Engine Immobilizer System

2. Construction

The configuration of the engine control system in the 2AZ-FE engine is shown in the following chart. SENSORS ACTUATORS

2. Construction

The configuration of the engine control system in the 2AZ-FE engine is shown in the following chart. SENSORS ACTUATORS

Immobilizer System

(Continued)

01meg04y

Neutral Switch Safety Position Camry

01meg05y

01meg05y

*: Models with Engine Immobilizer System

3. Engine Control System Diagram

Park/Neutral Position Switch

Accelerator Pedal Position Sensor

Ignition ^ Switch

Park/Neutral Position Switch

Accelerator Pedal Position Sensor

Ignition ^ Switch

Toyota Carina Ignition Module

Canister Pump Module

• Leak Detection Pump

• Canister Pressure Sensor

Heated Oxygen Sensor (Bank 1, Sensor 2)

Air-fuel Ratio Sensor (Bank l, Sensor l)

Canister Pump Module

• Leak Detection Pump

• Canister Pressure Sensor

Heated Oxygen Sensor (Bank 1, Sensor 2)

Air-fuel Ratio Sensor (Bank l, Sensor l)

01meg09y

4. Layout of Main Components

DLC3

Accelerator Pedal Position Sensor

Mass Air Flow Meter (Built-in Intake Air Temperature Sensor)

VSV (for EVAP)

Battery Current Sensor

DLC3

Accelerator Pedal Position Sensor

Mass Air Flow Meter (Built-in Intake Air Temperature Sensor)

VSV (for EVAP)

Toyota Rav4 Sensor Bank Sensor

Air Fuel Ratio Sensor (Bank 1, Sensor 1)

Heated Oxygen Sensor (Bank 1, Sensor 2)

Fuel Pump

Air Fuel Ratio Sensor (Bank 1, Sensor 1)

Heated Oxygen Sensor (Bank 1, Sensor 2)

Injector

Knock Sensor

Camshaft Timing Oil Control Valve

Crakshaft Position Sensor

Injector

Knock Sensor

Camshaft Timing Oil Control Valve

Crakshaft Position Sensor

Toyota Hilux 1996 Oxygen Sensor Diagram

Ignition Coil with Igniter

Throttle Position Sensor

Camshaft Position Sensor

Water Temperature Sensor

Fuel Pump

Canister Pump Module

• Leak Detection Pump

• Canister Pressure Sensor

Ignition Coil with Igniter

Throttle Position Sensor

Camshaft Position Sensor

Water Temperature Sensor

01meg31y

5. Main Components of Engine Control System General

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

Component

Outline

Quantity

ECM

32-bit CPU

1

Mass Air Flow Meter

Hot-wire Type

1

Crankshaft Position Sensor (Rotor Teeth)

Pick-up Coil Type (36-2)

1

Camshaft Position Sensor (Rotor Teeth)

Pick-up Coil Type (3)

1

Throttle Position Sensor

Non-contact Type

1

Accelerator Pedal Position Sensor

Non-contact Type

1

Knock Sensor

Built-in Piezoelectric Element Type (Flat Type)

1

Air-fuel Ratio Sensor (Bank 1, Sensor 1)

Type with Heater (Planar Type)

1

Heated Oxygen Sensor (Bank 1, Sensor 2)

Type with Heater (Cup Type)

1

Injector

12-hole Type

4

The 32-bit CPU of the ECM is used to increase the speed for processing the signals.

Air-fuel Ratio Sensor and Heated Oxygen Sensor 1) General

• The air-fuel ratio sensor and heated oxygen sensor differ in output characteristics.

• Approximately 0.4V is constantly applied to the air-fuel ratio sensor, which outputs an amperage that varies in accordance with the oxygen concentration in the exhaust emission. The ECM converts the changes in the output amperage into voltage in order to linearly detect the present air-fuel ratio. The air-fuel ratio sensor data is read out by the hand-held tester.

• The output voltage of the heated oxygen sensor changes in accordance with the oxygen concentration in the exhaust emission. The ECM uses this output voltage to determine whether the present air-fuel ratio is richer or leaner than the stoichiometric air-fuel ratio.

Air-fuel

Ratio

Sensor

Air-fuel

Ratio

Sensor

Toyota Highlander Heated Oxygen Sensor
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Air-fuel Ratio Sensor Circuit

Heated Oxygen Sensor

: Air-fuel Ratio Sensor : Heated Oxygen Sensor

Air-fuel Ratio Sensor Data Displayed on Hand-held Tester

Toyota Highlander Heated Oxygen Sensor

Heated Oxygen Sensor Output (V)

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Responses

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