Engine Control System General

The engine control system of the 2GR-FE engine has the following features.

System

Outline

(Sequential Multiport Fuel Injection) [See page EG-117]

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

(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.

• This system selects the optimal ignition timing in accordance with the signals received from the sensors and sends the (IGT) ignition signal to the igniter.

ETCS-i

(Electronic Throttle Control

System-intelligent) [See page EG-118]

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

Dual VVT-i (Variable Valve Timing-intelligent) System

[See page EG-120]

Controls the intake and exhaust camshafts to an optimal valve timing in accordance with the engine condition.

ACIS

(Acoustic Control Induction System) [See page EG-126]

The intake air passages are switched according to the engine speed and throttle valve opening angle to provided high performance in all speed ranges.

Air Intake Control System

[See page EG-128]

The intake air duct is divided into two areas, and the ECM controls the air intake control valve and the actuator that are provided in one of the areas to reduce the amount of engine noise.

Fuel Pump Control [See page EG-53 in 2AZ-FE section]

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

• The fuel pump is stopped, when the SRS airbag is deployed in a frontal, side, and rear side collision.

Air Conditioning Cut-off Control

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

Charging Control [See page EG-65 in 2AZ-FE section]

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

Cooling Fan Control [See page EG-129]

The cooling fan ECU steplessly controls the speed of the fans in accordance with the engine coolant temperature, vehicle speed, engine speed, and air conditioning operating conditions. As a result, the cooling performance is improved.

(Continued)

System

Outline

Air-fuel Ratio Sensor and Oxygen Sensor Heater Control

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

Evaporative Emission Control

[See page EG-131]

• The ECM controls the purge flow of evaporative emission (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 EVAP control system pressure.

Engine Immobilizer

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

Diagnosis [See page EG-132]

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

Fail-safe

[See page EG-133]

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

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