FUNCTION
By controlling the throttle valve opening angle in accordance with the accelerator pedal opening angle, the ECM generates the most appropriate engine output through the whole driving range, helping realize both acceleration operability and vehicle stability.
A throttle body assembly is used to perform throttle valve opening angle control, idle speed control (ISC), deceleration control, maximum speed control, ECT cooperative control, traction control (including VSC) and cruise control during normal driving.
Cooperative control with the powertrain system allows for excellent driving performance, and cooperative control with the skid control ECU (TRC/VSC) ensures vehicle stability.
A combination switch assembly is provided. Selecting a mode using the combination switch assembly changes the throttle valve opening angle for each accelerator pedal operation. 4 modes are provided: NORMAL, SPORT (SPORT S and SPORT S+), ECO and SNOW*.
*: Except models for G.C.C. countries
The main CPU and sub CPU of the ECM mutually monitor each other, ensuring the reliability of the system.
The throttle position sensor and accelerator pedal sensor assembly employ a dual-circuit system to reinforce the fail-safe function, thereby ensuring reliability.
| Driving Control | Normal mode | Controls the throttle valve opening angle to generate engine output in accordance with driving conditions and accelerator pedal position. |
| SPORT S mode, SPORT S+ mode | Regulates the throttle valve opening angle to enhance responsiveness to the driver's accelerator pedal operation. | |
| SNOW mode*1 | When SNOW mode is selected manually or selected automatically due to skid control ECU judgment, the system regulates the throttle valve opening angle to stabilize the vehicle when driving on a slippery road, such as on snow. | |
| ECO mode | Regulates the throttle valve opening angle to moderate the torque requested by accelerator pedal operation in order to enhance actual fuel consumption. | |
| Cruise Control | Constant speed driving is controlled by the ECM. | |
| Dynamic Radar Cruise Control*2 | Constant speed driving (including vehicle-to-vehicle distance control) is controlled in accordance with signals from the driving support ECU assembly. | |
| Idle Speed Control | Controls fast idle speed in accordance with the engine coolant temperature and controls idle speed after the engine has warmed up. Also controls idle speed using the throttle opening angle in accordance with engine accessory load. | |
| Deceleration Control | Opens the throttle valve when decelerating to introduce a larger amount of air, reducing the vacuum in the intake. This reduces the amount of oil drawn into the combustion chambers, reducing oil consumption as well as preventing the engine from stalling due to decreased engine speed. | |
| ECT Cooperative Control (Control at Variable Speed) | Controls the throttle valve opening angle when shifting, realizing quicker shifts and reduced shock during upshifts and downshifts. | |
| TRC/VSC Cooperative Control | Performs control to stabilize the vehicle behavior according to the skid control ECU when TRC and VSC are activated. | |
*1: Except models for G.C.C. countries
*2: Models with dynamic radar cruise control system