Idle Speeds Control
Idling is maintained steady by controlling idle speed according to the operating condition of the engine and engine load when the accelerator pedal is not depressed.
ECM controls idle speeds according to the following sensors and signals.
- Engine coolant temperature sensor
- Pressure sensor downstream of throttle valve (Engine load)
- Battery voltage
- A/C auto amp. (air conditioner activation status)
ECM adjusts idle speed through the throttle valve control and determines fuel injection time according to the amount of intake air. In addition, ECM can adjust the ignition timing up to 20 degrees in retard or advance direction to stabilize idle speed.
NOTE:
The ignition timing control responds faster than the throttle valve control. ECM controls idle speed according to the following operating conditions and engine load.
- During warm-up
- Shifting to D or R range
- Turning on air conditioner compressor
- Purge