All ECU’s use several sensors to ascertain load. However the method applied differs between engines as being the Silvertop employs a straightforward Vane type airflow meter while the Blacktop works by using a far more elaborate vacuum (MAP) and throttle place (TPS) for bigger throttle openings wherever there's no vacuum. https://7bookmarks.com/story18391612/the-basic-principles-of-toyota-4age-blacktop-engine-for-sale