Idle Speed/Throttle Actuator - Electronic: Description and Operation

DESCRIPTION
The ECM actuates the IACV-AAC valve by an ON/OFF pulse. The longer that ON duty is left on, the larger the amount of air that will flow through the IACV-AAC valve.




Idle Air Adjusting (IAA) Unit
The IAA unit is made up of the IACV-AAC valve and idle adjusting screw. It receives the signal from the ECM and controls the idle speed at the preset value.