Idle Up Control Valve: Description and Operation

Idle Air Adjusting Unit:

Idle Air Adjusting (I.A.A.) Unit

The I.A.A. unit is made up of the IACV-AAC valve, IACV-FICD solenoid valve and idle adjust screw. It receives the signal from the ECM and controls the idle speed at the preset value. The lACV-FICD solenoid valve compensates for changes in idle speed caused by the operation of the air compressor.