DTC P0506: Idle Speed Low: Description

Throttle Actuator (TAC) motor is controlled by TAC module, using various inputs from Powertrain Control Module (PCM) which are communicated across serial data. DC motor located on throttle body drives throttle plate. To decrease idle speed, TAC module commands throttle closed, reducing air flow into engine. To increase idle speed, TAC module commands throttle plate open allowing more air to bypass throttle plate.