Engine Idle Speed Control

ECM controls idle speed based on engine load and temperature. Engine idle speed is kept at the optimum speed by controlling amount of air that by-passes throttle valve. ECM controls Idle Speed Control (ISC) motor to keep the engine running at a pre-set idle target speed in accordance with the engine temperature and power steering (if equipped) and air conditioning loads. When engine load increases because of power steering and/or air conditioning activation, the ECM will increase engine idle speed to avoid fluctuations in engine speed.