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*19 *20 Idle Control System Diagram Intake Air System Diagram 11-66 Fuel and Emissions Systems System Description (cont’d) BLK BLK/ YEL/BLK ECM/PCM BLK AIR CLEANER AIR INTAKE DUCT IAC VALVE ENGINE THROTTLE BODY INTAKE MANIFOLD VARIOUS From BLK BLK/ YEL/BLK ECM/PCM BLK AIR CLEANER AIR INTAKE DUCT IAC VALVE ENGINE THROTTLE BODY INTAKE MANIFOLD VARIOUS From RESONATOR The idle speed of the engine is controlled by the Idle Air Control (IAC) valve: • After the engine starts, the IAC valve opens for a certain amount of time. The amount of air is increased to raise the idle speed. • When the engine coolant temperature is low, the IAC valve is opened to obtain the proper fast idle speed. The amount of bypassed air is controlled in relation to engine coolant temperature. This system supplies air for engine needs. A resonator in the intake air pipe provides additional silencing as air is 05/06/27 17:32:45 61S6M040_110_0066 |