The ECU calculates the injection quantity and timing, ignition timing and, in later model vehicles, the camshaft advance or retard from information collected by the various sensors around the engine. It also monitors the sensors and actuators for faults; storing this information in the form of Diognostic Trouble Codes to be read later with the aid of a scan tool. Automotive Service Solutions stocks Australia's largest range of Quality Remanufactured Engine Management Parts as well as ramanufacturing and repair facilities.