Circuit Description

PCM controls Idle Air Control (IAC) valve in order to regulate air flow through idle air by-pass passage. Amount of air flowing through idle air by-pass passage determines idle speed. IAC valve is regulated according to engine load. A stalling condition could be caused by IAC valve not functioning properly.

DTC will set when difference from target speed is 100 RPM less than target value for more than 20 seconds, or difference from target speed is 200 RPM greater than target value for more than 20 seconds.