Santa Fe L4-2.4L (2001)
Idle Speed: Description and Operation
GENERAL INFORMATION
The Multiport Fuel Injection System consists of sensors which detect the engine conditions, the ENGINE CONTROL MODULE (ECM) which controls
the system based on signals from these sensors, and actuators which operate under the control of the ECM. The ECM carries out activities such as fuel
injection control, idle air control and ignition timing control. In addition, the ECM is equipped with several diagnostic test modes which simplify the
troubleshooting when a problem develops.
IDLE SPEED CONTROL
The idle speed is kept at the optimum speed by controlling the amount of air that bypasses the throttle valve in accordance with changes in idling
conditions and engine load during idling. The ECM drives the idle speed control (ISC) motor to keep the engine running at the pre-set idle target speed
in accordance with the engine coolant temperature and air conditioning load. In addition, when the air conditioning switch is turned off and on while the
engine is idling, the ISC motor operates to adjust the throttle valve bypass air amount in accordance with the engine load conditions in order to avoid
fluctuations in the engine speed.
