Odyssey LX V6-3.5L (2000)
Idle Speed/Throttle Actuator - Electronic: Description and Operation
Idle Air Control (IAC) Valve
To maintain the proper idle speed, the IAC valve changes the amount of air bypassing the throttle body in response to an electrical signal from the PCM.
Idle Control System
When the engine is cold, the A/C compressor is on, the transmission is in gear, the brake pedal is pressed, the power steering load is high, or the
alternator is charging, the PCM controls current to the A/C valve to maintain the correct idle speed. Refer to the System Diagram to see the functional
layout of the system.
Idle Control System
Idle Control System Diagram
The idle speed of the engine is controlled by the Idle Air Control (IAC) valve:
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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.
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When the engine coolant temperature is low, the AC valve is opened to obtain the proper fast idle speed. The amount of bypassed air is thus
controlled in relation to engine coolant temperature.
