ETCS-i (Electronic Throttle Control System-intelligent)


The ETCS-i (Electronic Throttle Control System-intelligent) is a system that uses a computer to electrically control the throttle valve opening. Conventional throttle valve opening has been controlled by directly a cable from the accelerator pedal to the throttle valve to open and close it. In this system, the cable is eliminated, and the engine ECU uses the throttle control motor to control the throttle valve opening angle to the optimum amount in response to the amount that the accelerator pedal is depressed. In addition, the accelerator pedal opening angle is detected by the accelerator pedal position sensor, and the throttle valve opening angle is detected by the throttle position sensor. The ETCS-i system consists of the accelerator pedal position sensor, engine ECU, and throttle body. The throttle body contains the throttle valve, throttle control motor, throttle position sensor, and other components.

A majority of engine control systems are equipped with the following systems, although there are differences among engines, in addition to the EFI, ESA, and ISC systems. All of these systems are controlled by the engine ECU.

•ETCS-i (Electronic Throttle Control System-intelligent)
•VVT-i (Variable Valve Timing-intelligent)
•VVTL-i (Variable Valve Timing and Lift-intelligent)
•Oxygen sensor/Air fuel ratio sensor heater control system
•Air conditioner control system
•Cooling fan control
•ACIS (Acoustic Control Induction System)
•AI (Air Injection) control system/AS (Air Suction) control system
•Evaporative emission control system
•Air intake control system
•Fuel octane judgement
•ECT OD cut-off control system
•EGR cut-off control system
•T-VIS (Toyota-Variable Induction System)
•SCV (Swirl Control Valve) system
•Turbocharging pressure control system
•Supercharger control system
•EHPS (Electro-Hydraulic Power Steering) control system

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