Idle Speed Motor Position Sensor: Description and Operation

Purpose

The IAC valve position sensor converts the changes (increase or decrease) in the valve position of the idle air control (IAC) motor into pulse signals and inputs these signals to the engine control module. The engine control module determines the valve position from these singals, and also controls the idle air control motor.

Operation

5V power is supplied to the IAC valve position sensor from the engine control module, and the ground connection is positioned in the engine control module.

5V power is applied to the two IAC valve position sensor output terminals from the engine control module. When the IAC valve position is changed (increased or decreased) by the DC motor inside the IAC motor, the AC valve position sensor generates a pulse signal from the opening and closing between the output terminal and the ground.