HOSE AS 4567001 - Caterpillar

electronic control module (ECM) determines the atmospheric pressure by measuring an electrical signal from the atmospheric pressure sensor. The sensor is located on the mounting bracket for the ECM at the front right corner of the engine. Turbocharger inlet pressure is determined by measuring an electrical signal from the turbocharger inlet pressure sensors. The sensors are located in the air induction tubes. The air induction tubes are between the air filters and the turbochargers.The ECM calculates the pressure drop across the air filters by subtracting the air pressure in the air inlet system from the atmospheric pressure. The maximum restriction for the air filter that is allowed is equal to 6.2 kPa (25 inch of H2O). If the air filter restriction exceeds this amount, a warning and a derate are displayed on the monitoring panel. The fuel will be limited one percent. If the air inlet restriction increases, the fuel will be limited two percent for every 1 kPa (4 inch of H2O) increase in the air inlet restriction. The maximum derate is 20 percent. The event will also be logged in the permanent ECM memory. Factory passwords are required to clear this information.