The Intake Manifold Control (IMRC) regulates the amount of air allowed into the intake system. The IMRC uses the information provided by the PCM (Powertrain Control Module) regarding the driving conditions to perform this regulation. In addition to reducing toxic emissions, the intake air regulation improves the air/fuel mixture.
The IMRC has a vacuum actuator, a solenoid, intake manifold butterfly valve plates, individual cylinder lines, rods that are connected to the butterfly valve plates. Besides, it has return springs that keep the butterfly plates open. The intake manifold butterfly plates open and close, which allows restriction of airflow to the inlet.
The PCM uses the information provided by the Intake Manifold Control (IMRC) Sensor, Barometric Pressure (BARO) Sensor, and Mass Air Flow (MAF) sensor to determine the right position of the plates. If the voltage readings from the IMRC Sensor, MAF Sensor, and BARO Sensor indicate that the throttle valve plates are not in the right position, the P2012 OBDII DTC will be set.