Electronic Throttle Control System Description
For locations of each component on the vehicle, refer to the Component Location Index .
Overview
The electronic throttle control system (ETCS) opens and closes the throttle valve by electronically. This system consists of a throttle actuator built into the throttle body, throttle valve and throttle position (TP) sensor A/B, accelerator pedal position (APP) sensor A/B, ETCS driver built into the powertrain control module (PCM).
ETCS is a system that opens and closes the throttle valve electronically and has various functions such as:
- Idle Control Function
- Accelerator Control Function
- Fail-Safe Function
- Relationships with other systems
Control
When the accelerator pedal is operated, the APP sensors are driven and the accelerator pedal position is detected. The accelerator pedal position is sent to the PCM, and the PCM drives the throttle actuator in the throttle body based on the delivered throttle pedal position to open or close the throttle valve. Throttle position is detected by the TP sensors in the throttle body and sent to the PCM. The PCM drives the throttle actuator to control the throttle position during idling, during various system control, and based on the signals from the APP sensors.
Change of ETCS control
The PCM changes drive force characteristics according to the mode selected. Under SNOW mode, the system changes the drive force MAP and shift MAP for sudden pedal operation, thus reducing tire slippage when taking off on snowy roads. On the other hand, under ECON ON mode, the system makes drive force MAP milder than actual pedal operation to reduce electric energy and fuel consumption. Drive force relative to accelerator pedal operation is adjusted under each mode, and in the mid range up to the state with the pedal being fully depressed, different drive force characteristics are set for each mode. Therefore integrated drive mode system can meet a wide range of driver's needs on various driving situations.