Electronic Idle Speed Control

Idle speed ECU is integrated in CIS-E ECU but is functionally separate from CIS-E. Idle speed air valve, located in throttle valve by-pass hose, receives signals from idle speed ECU.

The idle speed control system also is influenced by the airflow sensor voltage signal. The control unit measures the airflow rate. In combination with engine speed, the position of the airflow sensor potentiometer and the coolant temperature, the idle speed air valve controls the idle speed.

When ignition is switched on, idle speed ECU is energized. Electronic control system generates a frequency of 100 Hz.