Idle Air Control
The PCM controls a two-coil stepper motor which controls the bypass air intake into the throttle body to decrease or increase engine idle speed. The motor allows air to bypass the throttle plate and enter the intake manifold. The determination of how much air is allowed to enter the engine is based on current engine speed, A/C compressor operation (On/Off) , coolant temperature, throttle position or if the transaxle controller requests greater engine torque during power-off downshifts (automatic transaxle vehicles only).