RAM 2500 Truck 2WD V10-8.0L VIN W MDC (1999)
Idle Speed/Throttle Actuator - Electronic: Description and Operation
IDLE AIR CONTROL (IAC) MOTOR-PCM OUTPUT
Idle Air Control Motor Location
The IAC motor is mounted to the side of the throttle body and is controlled by the powertrain control module (PCM).
Idle Air Control Passage
The throttle body has an air control passage that provides air for the engine at idle (the throttle plate is closed). The IAC motor pintle protrudes
into the air control passage and regulates air flow through it. Based on various sensor inputs, the powertrain control module (PCM) adjusts engine
idle speed by moving the IACK motor pintle in and out of the air control passage. The IAC motor is positioned when the ignition key is turned to
the On position.
