The idle air control valve sometimes known as an IAC, is an electrical actuating device designed to electromechanically control engine idle speed.
The knock sensor is an integral part of the modern vehicle engine management system. The knock sensor designed to detect and respond to vibrations caused by vehicle engine advanced timing detonation, known as engine knock or pinging.
The manifold absolute pressure sensor, sometimes known as a MAP sensor, is an electrical device designed to measure manifold pressure within the vehicle intake manifold.
The mass air flow sensor, sometimes known as a MAF sensor or air flow meter, is an electrical device designed to measure the flow of air entering the vehicle intake manifold.
The throttle position sensor, sometimes known as a TPS, is an electrical device designed to monitor the position of the vehicle throttle valve, plate, butterfly or spindle.