Landcruiser AWD L6-4.5L (1FZ-FE) (1997)
Idle Speed/Throttle Actuator - Electronic: Description and Operation
The step motor type IAC valve is located in front of the intake air chamber. Intake air bypassing the throttle valve is directed to the IAC valve
through a passage.
A step motor is built into the IAC valve. It consists of four coils, a magnetic rotor, valve shaft and valve. When current flows to the coils due to
signals from the ECM, the rotor turns and moves the valve shaft forward or backward, changing the clearance between the valve and the valve
seat.
In this way the intake air volume bypassing the throttle valve is regulated, controlling the engine speed. There are 125 possible positions to which
the valve can be opened.